diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1f2c161..dc4328e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -59,8 +59,8 @@
   ast/case_statement.h
   ast/cast_expression.cc
   ast/cast_expression.h
-  ast/const_initializer_expression.cc
-  ast/const_initializer_expression.h
+  ast/constructor_expression.cc
+  ast/constructor_expression.h
   ast/continue_statement.cc
   ast/continue_statement.h
   ast/decorated_variable.cc
@@ -85,8 +85,6 @@
   ast/if_statement.h
   ast/import.cc
   ast/import.h
-  ast/initializer_expression.cc
-  ast/initializer_expression.h
   ast/int_literal.cc
   ast/int_literal.h
   ast/kill_statement.cc
@@ -113,6 +111,8 @@
   ast/relational_expression.h
   ast/return_statement.cc
   ast/return_statement.h
+  ast/scalar_constructor_expression.cc
+  ast/scalar_constructor_expression.h
   ast/set_decoration.cc
   ast/set_decoration.h
   ast/statement.cc
@@ -133,8 +133,8 @@
   ast/struct_member_offset_decoration.h
   ast/switch_statement.cc
   ast/switch_statement.h
-  ast/type_initializer_expression.h
-  ast/type_initializer_expression.cc
+  ast/type_constructor_expression.h
+  ast/type_constructor_expression.cc
   ast/type/alias_type.cc
   ast/type/alias_type.h
   ast/type/array_type.cc
@@ -260,7 +260,6 @@
   ast/call_expression_test.cc
   ast/case_statement_test.cc
   ast/cast_expression_test.cc
-  ast/const_initializer_expression_test.cc
   ast/continue_statement_test.cc
   ast/decorated_variable_test.cc
   ast/else_statement_test.cc
@@ -281,6 +280,7 @@
   ast/regardless_statement_test.cc
   ast/relational_expression_test.cc
   ast/return_statement_test.cc
+  ast/scalar_constructor_expression_test.cc
   ast/set_decoration_test.cc
   ast/struct_member_test.cc
   ast/struct_member_offset_decoration_test.cc
@@ -296,7 +296,7 @@
   ast/type/struct_type_test.cc
   ast/type/u32_type_test.cc
   ast/type/vector_type_test.cc
-  ast/type_initializer_expression_test.cc
+  ast/type_constructor_expression_test.cc
   ast/uint_literal_test.cc
   ast/unary_derivative_expression_test.cc
   ast/unary_method_expression_test.cc
@@ -410,10 +410,10 @@
 if(${TINT_BUILD_SPV_WRITER})
   list(APPEND TINT_TEST_SRCS
     writer/spirv/binary_writer_test.cc
+    writer/spirv/builder_constructor_expression_test.cc
     writer/spirv/builder_entry_point_test.cc
     writer/spirv/builder_function_test.cc
     writer/spirv/builder_global_variable_test.cc
-    writer/spirv/builder_initializer_expression_test.cc
     writer/spirv/builder_literal_test.cc
     writer/spirv/builder_return_test.cc
     writer/spirv/builder_test.cc
@@ -436,6 +436,7 @@
     writer/wgsl/generator_impl_call_test.cc
     writer/wgsl/generator_impl_case_test.cc
     writer/wgsl/generator_impl_cast_test.cc
+    writer/wgsl/generator_impl_constructor_test.cc
     writer/wgsl/generator_impl_continue_test.cc
     writer/wgsl/generator_impl_else_test.cc
     writer/wgsl/generator_impl_entry_point_test.cc
@@ -444,7 +445,6 @@
     writer/wgsl/generator_impl_identifier_test.cc
     writer/wgsl/generator_impl_if_test.cc
     writer/wgsl/generator_impl_import_test.cc
-    writer/wgsl/generator_impl_initializer_test.cc
     writer/wgsl/generator_impl_kill_test.cc
     writer/wgsl/generator_impl_loop_test.cc
     writer/wgsl/generator_impl_member_accessor_test.cc
diff --git a/src/ast/array_accessor_expression.h b/src/ast/array_accessor_expression.h
index 5988085..73a866e 100644
--- a/src/ast/array_accessor_expression.h
+++ b/src/ast/array_accessor_expression.h
@@ -35,7 +35,7 @@
   ArrayAccessorExpression(std::unique_ptr<Expression> array,
                           std::unique_ptr<Expression> idx_expr);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the array accessor source
   /// @param array the array
   /// @param idx_expr the index expression
   ArrayAccessorExpression(const Source& source,
diff --git a/src/ast/as_expression.h b/src/ast/as_expression.h
index 0a7649b..e2d1cc1 100644
--- a/src/ast/as_expression.h
+++ b/src/ast/as_expression.h
@@ -36,7 +36,7 @@
   /// @param expr the expr
   AsExpression(type::Type* type, std::unique_ptr<Expression> expr);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the as expression source
   /// @param type the type
   /// @param expr the expr
   AsExpression(const Source& source,
diff --git a/src/ast/assignment_statement.h b/src/ast/assignment_statement.h
index 4f6e6b8..c49472c 100644
--- a/src/ast/assignment_statement.h
+++ b/src/ast/assignment_statement.h
@@ -36,7 +36,7 @@
   AssignmentStatement(std::unique_ptr<Expression> lhs,
                       std::unique_ptr<Expression> rhs);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the assignment statement source
   /// @param lhs the left side of the expression
   /// @param rhs the right side of the expression
   AssignmentStatement(const Source& source,
diff --git a/src/ast/break_statement.h b/src/ast/break_statement.h
index aaa8526..298933c 100644
--- a/src/ast/break_statement.h
+++ b/src/ast/break_statement.h
@@ -31,7 +31,7 @@
   /// Constructor
   BreakStatement();
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the break statement source
   explicit BreakStatement(const Source& source);
   /// Constructor
   /// @param condition the condition type
@@ -39,7 +39,7 @@
   BreakStatement(StatementCondition condition,
                  std::unique_ptr<Expression> conditional);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the break statement source
   /// @param condition the condition type
   /// @param conditional the condition expression
   BreakStatement(const Source& source,
diff --git a/src/ast/call_expression.h b/src/ast/call_expression.h
index 0644d69..56df9b9 100644
--- a/src/ast/call_expression.h
+++ b/src/ast/call_expression.h
@@ -36,7 +36,7 @@
   CallExpression(std::unique_ptr<Expression> func,
                  std::vector<std::unique_ptr<Expression>> params);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the call expression source
   /// @param func the function
   /// @param params the parameters
   CallExpression(const Source& source,
diff --git a/src/ast/cast_expression.h b/src/ast/cast_expression.h
index 0deb715..52966a2 100644
--- a/src/ast/cast_expression.h
+++ b/src/ast/cast_expression.h
@@ -36,7 +36,7 @@
   /// @param expr the expr
   CastExpression(type::Type* type, std::unique_ptr<Expression> expr);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the cast expression source
   /// @param type the type
   /// @param expr the expr
   CastExpression(const Source& source,
diff --git a/src/ast/const_initializer_expression.cc b/src/ast/const_initializer_expression.cc
deleted file mode 100644
index 101bb75..0000000
--- a/src/ast/const_initializer_expression.cc
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2020 The Tint Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "src/ast/const_initializer_expression.h"
-
-namespace tint {
-namespace ast {
-
-ConstInitializerExpression::ConstInitializerExpression()
-    : InitializerExpression() {}
-
-ConstInitializerExpression::ConstInitializerExpression(
-    std::unique_ptr<Literal> literal)
-    : InitializerExpression(), literal_(std::move(literal)) {}
-
-ConstInitializerExpression::ConstInitializerExpression(
-    const Source& source,
-    std::unique_ptr<Literal> litearl)
-    : InitializerExpression(source), literal_(std::move(litearl)) {}
-
-ConstInitializerExpression::~ConstInitializerExpression() = default;
-
-bool ConstInitializerExpression::IsValid() const {
-  return literal_ != nullptr;
-}
-
-void ConstInitializerExpression::to_str(std::ostream& out,
-                                        size_t indent) const {
-  make_indent(out, indent);
-  out << "ConstInitializer{" << literal_->to_str() << "}" << std::endl;
-}
-
-}  // namespace ast
-}  // namespace tint
diff --git a/src/ast/constructor_expression.cc b/src/ast/constructor_expression.cc
new file mode 100644
index 0000000..9ff88b4
--- /dev/null
+++ b/src/ast/constructor_expression.cc
@@ -0,0 +1,43 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/ast/constructor_expression.h"
+
+#include <assert.h>
+
+#include "src/ast/scalar_constructor_expression.h"
+#include "src/ast/type_constructor_expression.h"
+
+namespace tint {
+namespace ast {
+
+ConstructorExpression::ConstructorExpression() = default;
+
+ConstructorExpression::~ConstructorExpression() = default;
+
+ConstructorExpression::ConstructorExpression(const Source& source)
+    : Expression(source) {}
+
+ScalarConstructorExpression* ConstructorExpression::AsScalarConstructor() {
+  assert(IsScalarConstructor());
+  return static_cast<ScalarConstructorExpression*>(this);
+}
+
+TypeConstructorExpression* ConstructorExpression::AsTypeConstructor() {
+  assert(IsTypeConstructor());
+  return static_cast<TypeConstructorExpression*>(this);
+}
+
+}  // namespace ast
+}  // namespace tint
diff --git a/src/ast/constructor_expression.h b/src/ast/constructor_expression.h
new file mode 100644
index 0000000..6846768
--- /dev/null
+++ b/src/ast/constructor_expression.h
@@ -0,0 +1,60 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef SRC_AST_CONSTRUCTOR_EXPRESSION_H_
+#define SRC_AST_CONSTRUCTOR_EXPRESSION_H_
+
+#include "src/ast/expression.h"
+
+namespace tint {
+namespace ast {
+
+class ScalarConstructorExpression;
+class TypeConstructorExpression;
+
+/// Base class for constructor style expressions
+class ConstructorExpression : public Expression {
+ public:
+  ~ConstructorExpression() override;
+
+  /// @returns true if this is an constructor expression
+  bool IsConstructor() const override { return true; }
+
+  /// @returns true if this is a scalar constructor
+  virtual bool IsScalarConstructor() const { return false; }
+  /// @returns true if this is a type constructor
+  virtual bool IsTypeConstructor() const { return false; }
+
+  /// @returns this as a scalar constructor expression
+  ScalarConstructorExpression* AsScalarConstructor();
+  /// @returns this as a type constructor expression
+  TypeConstructorExpression* AsTypeConstructor();
+
+ protected:
+  /// Constructor
+  ConstructorExpression();
+  /// Constructor
+  /// @param source the constructor source
+  explicit ConstructorExpression(const Source& source);
+  /// Move constructor
+  ConstructorExpression(ConstructorExpression&&) = default;
+
+ private:
+  ConstructorExpression(const ConstructorExpression&) = delete;
+};
+
+}  // namespace ast
+}  // namespace tint
+
+#endif  // SRC_AST_CONSTRUCTOR_EXPRESSION_H_
diff --git a/src/ast/continue_statement.h b/src/ast/continue_statement.h
index 26789f9..69aaaa6 100644
--- a/src/ast/continue_statement.h
+++ b/src/ast/continue_statement.h
@@ -31,7 +31,7 @@
   /// Constructor
   ContinueStatement();
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the continue statement source
   explicit ContinueStatement(const Source& source);
   /// Constructor
   /// @param condition the condition type
@@ -39,7 +39,7 @@
   ContinueStatement(StatementCondition condition,
                     std::unique_ptr<Expression> conditional);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the continue statement source
   /// @param condition the condition type
   /// @param conditional the condition expression
   ContinueStatement(const Source& source,
diff --git a/src/ast/decorated_variable.cc b/src/ast/decorated_variable.cc
index 038aaed..d5fc6cc 100644
--- a/src/ast/decorated_variable.cc
+++ b/src/ast/decorated_variable.cc
@@ -45,7 +45,7 @@
   out << "}" << std::endl;
 
   info_to_str(out, indent + 2);
-  initializer_to_str(out, indent + 2);
+  constructor_to_str(out, indent + 2);
   make_indent(out, indent);
   out << "}" << std::endl;
 }
diff --git a/src/ast/decorated_variable_test.cc b/src/ast/decorated_variable_test.cc
index fd4ad62..6d96f8e 100644
--- a/src/ast/decorated_variable_test.cc
+++ b/src/ast/decorated_variable_test.cc
@@ -70,7 +70,7 @@
   type::F32Type t;
   auto var = std::make_unique<Variable>("my_var", StorageClass::kFunction, &t);
   DecoratedVariable dv(std::move(var));
-  dv.set_initializer(std::make_unique<IdentifierExpression>("expr"));
+  dv.set_constructor(std::make_unique<IdentifierExpression>("expr"));
 
   std::vector<std::unique_ptr<VariableDecoration>> decos;
   decos.push_back(std::make_unique<BindingDecoration>(2));
diff --git a/src/ast/else_statement_test.cc b/src/ast/else_statement_test.cc
index 3e1aadc..8e5143d 100644
--- a/src/ast/else_statement_test.cc
+++ b/src/ast/else_statement_test.cc
@@ -16,9 +16,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/if_statement.h"
 #include "src/ast/nop_statement.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/bool_type.h"
 
 namespace tint {
@@ -29,7 +29,7 @@
 
 TEST_F(ElseStatementTest, Creation) {
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ConstInitializerExpression>(
+  auto cond = std::make_unique<ScalarConstructorExpression>(
       std::make_unique<BoolLiteral>(&bool_type, true));
   std::vector<std::unique_ptr<Statement>> body;
   body.push_back(std::make_unique<NopStatement>());
@@ -57,7 +57,7 @@
 
 TEST_F(ElseStatementTest, HasCondition) {
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ConstInitializerExpression>(
+  auto cond = std::make_unique<ScalarConstructorExpression>(
       std::make_unique<BoolLiteral>(&bool_type, true));
   ElseStatement e(std::move(cond), {});
   EXPECT_TRUE(e.HasCondition());
@@ -91,7 +91,7 @@
 }
 
 TEST_F(ElseStatementTest, IsValid_InvalidCondition) {
-  auto cond = std::make_unique<ConstInitializerExpression>();
+  auto cond = std::make_unique<ScalarConstructorExpression>();
   ElseStatement e(std::move(cond), {});
   EXPECT_FALSE(e.IsValid());
 }
@@ -106,7 +106,7 @@
 
 TEST_F(ElseStatementTest, ToStr) {
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ConstInitializerExpression>(
+  auto cond = std::make_unique<ScalarConstructorExpression>(
       std::make_unique<BoolLiteral>(&bool_type, true));
   std::vector<std::unique_ptr<Statement>> body;
   body.push_back(std::make_unique<NopStatement>());
@@ -116,7 +116,7 @@
   e.to_str(out, 2);
   EXPECT_EQ(out.str(), R"(  Else{
     (
-      ConstInitializer{true}
+      ScalarConstructor{true}
     )
     {
       Nop{}
diff --git a/src/ast/expression.cc b/src/ast/expression.cc
index 78041d6..08e536e 100644
--- a/src/ast/expression.cc
+++ b/src/ast/expression.cc
@@ -20,8 +20,8 @@
 #include "src/ast/as_expression.h"
 #include "src/ast/call_expression.h"
 #include "src/ast/cast_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/identifier_expression.h"
-#include "src/ast/initializer_expression.h"
 #include "src/ast/member_accessor_expression.h"
 #include "src/ast/relational_expression.h"
 #include "src/ast/unary_derivative_expression.h"
@@ -62,9 +62,9 @@
   return static_cast<IdentifierExpression*>(this);
 }
 
-InitializerExpression* Expression::AsInitializer() {
-  assert(IsInitializer());
-  return static_cast<InitializerExpression*>(this);
+ConstructorExpression* Expression::AsConstructor() {
+  assert(IsConstructor());
+  return static_cast<ConstructorExpression*>(this);
 }
 
 MemberAccessorExpression* Expression::AsMemberAccessor() {
diff --git a/src/ast/expression.h b/src/ast/expression.h
index ebc694b..67ad3c9 100644
--- a/src/ast/expression.h
+++ b/src/ast/expression.h
@@ -25,7 +25,7 @@
 class CallExpression;
 class CastExpression;
 class IdentifierExpression;
-class InitializerExpression;
+class ConstructorExpression;
 class MemberAccessorExpression;
 class RelationalExpression;
 class UnaryDerivativeExpression;
@@ -47,8 +47,8 @@
   virtual bool IsCast() const { return false; }
   /// @returns true if this is an identifier expression
   virtual bool IsIdentifier() const { return false; }
-  /// @returns true if this is an initializer expression
-  virtual bool IsInitializer() const { return false; }
+  /// @returns true if this is an constructor expression
+  virtual bool IsConstructor() const { return false; }
   /// @returns true if this is a member accessor expression
   virtual bool IsMemberAccessor() const { return false; }
   /// @returns true if this is a relational expression
@@ -70,8 +70,8 @@
   CastExpression* AsCast();
   /// @returns the expression as an identifier
   IdentifierExpression* AsIdentifier();
-  /// @returns the expression as an initializer
-  InitializerExpression* AsInitializer();
+  /// @returns the expression as an constructor
+  ConstructorExpression* AsConstructor();
   /// @returns the expression as a member accessor
   MemberAccessorExpression* AsMemberAccessor();
   /// @returns the expression as a relational expression
diff --git a/src/ast/identifier_expression.h b/src/ast/identifier_expression.h
index 8efe83c..38adc73 100644
--- a/src/ast/identifier_expression.h
+++ b/src/ast/identifier_expression.h
@@ -39,7 +39,7 @@
   /// @param name the name
   explicit IdentifierExpression(std::vector<std::string> name);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the identifier expression source
   /// @param name the name
   IdentifierExpression(const Source& source, std::vector<std::string> name);
   /// Move constructor
diff --git a/src/ast/initializer_expression.cc b/src/ast/initializer_expression.cc
deleted file mode 100644
index f28f3c3..0000000
--- a/src/ast/initializer_expression.cc
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2020 The Tint Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "src/ast/initializer_expression.h"
-
-#include <assert.h>
-
-#include "src/ast/const_initializer_expression.h"
-#include "src/ast/type_initializer_expression.h"
-
-namespace tint {
-namespace ast {
-
-InitializerExpression::InitializerExpression() = default;
-
-InitializerExpression::~InitializerExpression() = default;
-
-InitializerExpression::InitializerExpression(const Source& source)
-    : Expression(source) {}
-
-ConstInitializerExpression* InitializerExpression::AsConstInitializer() {
-  assert(IsConstInitializer());
-  return static_cast<ConstInitializerExpression*>(this);
-}
-
-TypeInitializerExpression* InitializerExpression::AsTypeInitializer() {
-  assert(IsTypeInitializer());
-  return static_cast<TypeInitializerExpression*>(this);
-}
-
-}  // namespace ast
-}  // namespace tint
diff --git a/src/ast/initializer_expression.h b/src/ast/initializer_expression.h
deleted file mode 100644
index 0067c20..0000000
--- a/src/ast/initializer_expression.h
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright 2020 The Tint Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef SRC_AST_INITIALIZER_EXPRESSION_H_
-#define SRC_AST_INITIALIZER_EXPRESSION_H_
-
-#include "src/ast/expression.h"
-
-namespace tint {
-namespace ast {
-
-class ConstInitializerExpression;
-class TypeInitializerExpression;
-
-/// Base class for initializer style expressions
-class InitializerExpression : public Expression {
- public:
-  ~InitializerExpression() override;
-
-  /// @returns true if this is an initializer expression
-  bool IsInitializer() const override { return true; }
-
-  /// @returns true if this is a constant initializer
-  virtual bool IsConstInitializer() const { return false; }
-  /// @returns true if this is a type initializer
-  virtual bool IsTypeInitializer() const { return false; }
-
-  /// @returns this as a const initializer expression
-  ConstInitializerExpression* AsConstInitializer();
-  /// @returns this as a type initializer expression
-  TypeInitializerExpression* AsTypeInitializer();
-
- protected:
-  /// Constructor
-  InitializerExpression();
-  /// Constructor
-  /// @param source the initializer source
-  explicit InitializerExpression(const Source& source);
-  /// Move constructor
-  InitializerExpression(InitializerExpression&&) = default;
-
- private:
-  InitializerExpression(const InitializerExpression&) = delete;
-};
-
-}  // namespace ast
-}  // namespace tint
-
-#endif  // SRC_AST_INITIALIZER_EXPRESSION_H_
diff --git a/src/ast/kill_statement.h b/src/ast/kill_statement.h
index 15bf061..bbb1040 100644
--- a/src/ast/kill_statement.h
+++ b/src/ast/kill_statement.h
@@ -26,7 +26,7 @@
   /// Constructor
   KillStatement();
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the kill statement source
   explicit KillStatement(const Source& source);
   /// Move constructor
   KillStatement(KillStatement&&) = default;
diff --git a/src/ast/loop_statement.h b/src/ast/loop_statement.h
index 73e8b7f..e7bd755 100644
--- a/src/ast/loop_statement.h
+++ b/src/ast/loop_statement.h
@@ -35,7 +35,7 @@
   LoopStatement(std::vector<std::unique_ptr<Statement>> body,
                 std::vector<std::unique_ptr<Statement>> continuing);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the loop statement source
   /// @param body the body statements
   /// @param continuing the continuing statements
   LoopStatement(const Source& source,
diff --git a/src/ast/member_accessor_expression.h b/src/ast/member_accessor_expression.h
index 996e3ae..b8e0dce 100644
--- a/src/ast/member_accessor_expression.h
+++ b/src/ast/member_accessor_expression.h
@@ -37,7 +37,7 @@
   MemberAccessorExpression(std::unique_ptr<Expression> structure,
                            std::unique_ptr<IdentifierExpression> member);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the member accessor expression source
   /// @param structure the structure
   /// @param member the member
   MemberAccessorExpression(const Source& source,
diff --git a/src/ast/nop_statement.h b/src/ast/nop_statement.h
index 6585728..551ba29 100644
--- a/src/ast/nop_statement.h
+++ b/src/ast/nop_statement.h
@@ -26,7 +26,7 @@
   /// Constructor
   NopStatement();
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the nop statement source
   explicit NopStatement(const Source& source);
   /// Move constructor
   NopStatement(NopStatement&&) = default;
diff --git a/src/ast/regardless_statement.h b/src/ast/regardless_statement.h
index cada546..06e2959 100644
--- a/src/ast/regardless_statement.h
+++ b/src/ast/regardless_statement.h
@@ -36,7 +36,7 @@
   RegardlessStatement(std::unique_ptr<Expression> condition,
                       std::vector<std::unique_ptr<Statement>> body);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the regardless statement source
   /// @param condition the condition expression
   /// @param body the body statements
   RegardlessStatement(const Source& source,
diff --git a/src/ast/relational_expression.h b/src/ast/relational_expression.h
index a35733d..d52afba 100644
--- a/src/ast/relational_expression.h
+++ b/src/ast/relational_expression.h
@@ -61,7 +61,7 @@
                        std::unique_ptr<Expression> lhs,
                        std::unique_ptr<Expression> rhs);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the relational expression source
   /// @param relation the relation type
   /// @param lhs the left side of the expression
   /// @param rhs the right side of the expression
diff --git a/src/ast/return_statement.h b/src/ast/return_statement.h
index ada4844..216e964 100644
--- a/src/ast/return_statement.h
+++ b/src/ast/return_statement.h
@@ -36,7 +36,7 @@
   /// @param value the return value
   explicit ReturnStatement(std::unique_ptr<Expression> value);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the return statement source
   /// @param value the return value
   ReturnStatement(const Source& source, std::unique_ptr<Expression> value);
   /// Move constructor
diff --git a/src/ast/scalar_constructor_expression.cc b/src/ast/scalar_constructor_expression.cc
new file mode 100644
index 0000000..7c8cd82
--- /dev/null
+++ b/src/ast/scalar_constructor_expression.cc
@@ -0,0 +1,45 @@
+// Copyright 2020 The Tint Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "src/ast/scalar_constructor_expression.h"
+
+namespace tint {
+namespace ast {
+
+ScalarConstructorExpression::ScalarConstructorExpression()
+    : ConstructorExpression() {}
+
+ScalarConstructorExpression::ScalarConstructorExpression(
+    std::unique_ptr<Literal> literal)
+    : ConstructorExpression(), literal_(std::move(literal)) {}
+
+ScalarConstructorExpression::ScalarConstructorExpression(
+    const Source& source,
+    std::unique_ptr<Literal> litearl)
+    : ConstructorExpression(source), literal_(std::move(litearl)) {}
+
+ScalarConstructorExpression::~ScalarConstructorExpression() = default;
+
+bool ScalarConstructorExpression::IsValid() const {
+  return literal_ != nullptr;
+}
+
+void ScalarConstructorExpression::to_str(std::ostream& out,
+                                         size_t indent) const {
+  make_indent(out, indent);
+  out << "ScalarConstructor{" << literal_->to_str() << "}" << std::endl;
+}
+
+}  // namespace ast
+}  // namespace tint
diff --git a/src/ast/const_initializer_expression.h b/src/ast/scalar_constructor_expression.h
similarity index 63%
rename from src/ast/const_initializer_expression.h
rename to src/ast/scalar_constructor_expression.h
index 46af8f4..2f977ab 100644
--- a/src/ast/const_initializer_expression.h
+++ b/src/ast/scalar_constructor_expression.h
@@ -12,37 +12,37 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef SRC_AST_CONST_INITIALIZER_EXPRESSION_H_
-#define SRC_AST_CONST_INITIALIZER_EXPRESSION_H_
+#ifndef SRC_AST_SCALAR_CONSTRUCTOR_EXPRESSION_H_
+#define SRC_AST_SCALAR_CONSTRUCTOR_EXPRESSION_H_
 
 #include <memory>
 #include <utility>
 
-#include "src/ast/initializer_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/literal.h"
 
 namespace tint {
 namespace ast {
 
-/// A constant initializer
-class ConstInitializerExpression : public InitializerExpression {
+/// A scalar constructor
+class ScalarConstructorExpression : public ConstructorExpression {
  public:
   /// Constructor
-  ConstInitializerExpression();
+  ScalarConstructorExpression();
   /// Constructor
   /// @param literal the const literal
-  explicit ConstInitializerExpression(std::unique_ptr<Literal> literal);
+  explicit ScalarConstructorExpression(std::unique_ptr<Literal> literal);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the constructor source
   /// @param literal the const literal
-  ConstInitializerExpression(const Source& source,
-                             std::unique_ptr<Literal> literal);
+  ScalarConstructorExpression(const Source& source,
+                              std::unique_ptr<Literal> literal);
   /// Move constructor
-  ConstInitializerExpression(ConstInitializerExpression&&) = default;
-  ~ConstInitializerExpression() override;
+  ScalarConstructorExpression(ScalarConstructorExpression&&) = default;
+  ~ScalarConstructorExpression() override;
 
-  /// @returns true if this is a constant initializer
-  bool IsConstInitializer() const override { return true; }
+  /// @returns true if this is a scalar constructor
+  bool IsScalarConstructor() const override { return true; }
 
   /// Set the literal value
   /// @param literal the literal
@@ -61,7 +61,7 @@
   void to_str(std::ostream& out, size_t indent) const override;
 
  private:
-  ConstInitializerExpression(const ConstInitializerExpression&) = delete;
+  ScalarConstructorExpression(const ScalarConstructorExpression&) = delete;
 
   std::unique_ptr<Literal> literal_;
 };
@@ -69,4 +69,4 @@
 }  // namespace ast
 }  // namespace tint
 
-#endif  // SRC_AST_CONST_INITIALIZER_EXPRESSION_H_
+#endif  // SRC_AST_SCALAR_CONSTRUCTOR_EXPRESSION_H_
diff --git a/src/ast/const_initializer_expression_test.cc b/src/ast/scalar_constructor_expression_test.cc
similarity index 67%
rename from src/ast/const_initializer_expression_test.cc
rename to src/ast/scalar_constructor_expression_test.cc
index 243df54..817905d 100644
--- a/src/ast/const_initializer_expression_test.cc
+++ b/src/ast/scalar_constructor_expression_test.cc
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/ast/const_initializer_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
@@ -22,44 +22,44 @@
 namespace ast {
 namespace {
 
-using ConstInitializerExpressionTest = testing::Test;
+using ScalarConstructorExpressionTest = testing::Test;
 
-TEST_F(ConstInitializerExpressionTest, Creation) {
+TEST_F(ScalarConstructorExpressionTest, Creation) {
   ast::type::BoolType bool_type;
   auto b = std::make_unique<BoolLiteral>(&bool_type, true);
   auto b_ptr = b.get();
-  ConstInitializerExpression c(std::move(b));
+  ScalarConstructorExpression c(std::move(b));
   EXPECT_EQ(c.literal(), b_ptr);
 }
 
-TEST_F(ConstInitializerExpressionTest, Creation_WithSource) {
+TEST_F(ScalarConstructorExpressionTest, Creation_WithSource) {
   ast::type::BoolType bool_type;
   auto b = std::make_unique<BoolLiteral>(&bool_type, true);
-  ConstInitializerExpression c(Source{20, 2}, std::move(b));
+  ScalarConstructorExpression c(Source{20, 2}, std::move(b));
   auto src = c.source();
   EXPECT_EQ(src.line, 20);
   EXPECT_EQ(src.column, 2);
 }
 
-TEST_F(ConstInitializerExpressionTest, IsValid) {
+TEST_F(ScalarConstructorExpressionTest, IsValid) {
   ast::type::BoolType bool_type;
   auto b = std::make_unique<BoolLiteral>(&bool_type, true);
-  ConstInitializerExpression c(std::move(b));
+  ScalarConstructorExpression c(std::move(b));
   EXPECT_TRUE(c.IsValid());
 }
 
-TEST_F(ConstInitializerExpressionTest, IsValid_MissingLiteral) {
-  ConstInitializerExpression c;
+TEST_F(ScalarConstructorExpressionTest, IsValid_MissingLiteral) {
+  ScalarConstructorExpression c;
   EXPECT_FALSE(c.IsValid());
 }
 
-TEST_F(ConstInitializerExpressionTest, ToStr) {
+TEST_F(ScalarConstructorExpressionTest, ToStr) {
   ast::type::BoolType bool_type;
   auto b = std::make_unique<BoolLiteral>(&bool_type, true);
-  ConstInitializerExpression c(std::move(b));
+  ScalarConstructorExpression c(std::move(b));
   std::ostringstream out;
   c.to_str(out, 2);
-  EXPECT_EQ(out.str(), R"(  ConstInitializer{true}
+  EXPECT_EQ(out.str(), R"(  ScalarConstructor{true}
 )");
 }
 
diff --git a/src/ast/type_initializer_expression.cc b/src/ast/type_constructor_expression.cc
similarity index 69%
rename from src/ast/type_initializer_expression.cc
rename to src/ast/type_constructor_expression.cc
index 5b47387..4b33bbc 100644
--- a/src/ast/type_initializer_expression.cc
+++ b/src/ast/type_constructor_expression.cc
@@ -12,28 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 
 namespace tint {
 namespace ast {
 
-TypeInitializerExpression::TypeInitializerExpression()
-    : InitializerExpression() {}
+TypeConstructorExpression::TypeConstructorExpression()
+    : ConstructorExpression() {}
 
-TypeInitializerExpression::TypeInitializerExpression(
+TypeConstructorExpression::TypeConstructorExpression(
     type::Type* type,
     std::vector<std::unique_ptr<Expression>> values)
-    : InitializerExpression(), type_(type), values_(std::move(values)) {}
+    : ConstructorExpression(), type_(type), values_(std::move(values)) {}
 
-TypeInitializerExpression::TypeInitializerExpression(
+TypeConstructorExpression::TypeConstructorExpression(
     const Source& source,
     type::Type* type,
     std::vector<std::unique_ptr<Expression>> values)
-    : InitializerExpression(source), type_(type), values_(std::move(values)) {}
+    : ConstructorExpression(source), type_(type), values_(std::move(values)) {}
 
-TypeInitializerExpression::~TypeInitializerExpression() = default;
+TypeConstructorExpression::~TypeConstructorExpression() = default;
 
-bool TypeInitializerExpression::IsValid() const {
+bool TypeConstructorExpression::IsValid() const {
   if (values_.empty()) {
     return false;
   }
@@ -48,9 +48,9 @@
   return true;
 }
 
-void TypeInitializerExpression::to_str(std::ostream& out, size_t indent) const {
+void TypeConstructorExpression::to_str(std::ostream& out, size_t indent) const {
   make_indent(out, indent);
-  out << "TypeInitializer{" << std::endl;
+  out << "TypeConstructor{" << std::endl;
   make_indent(out, indent + 2);
   out << type_->type_name() << std::endl;
 
diff --git a/src/ast/type_initializer_expression.h b/src/ast/type_constructor_expression.h
similarity index 72%
rename from src/ast/type_initializer_expression.h
rename to src/ast/type_constructor_expression.h
index 118eac4..fdc3941 100644
--- a/src/ast/type_initializer_expression.h
+++ b/src/ast/type_constructor_expression.h
@@ -12,42 +12,42 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef SRC_AST_TYPE_INITIALIZER_EXPRESSION_H_
-#define SRC_AST_TYPE_INITIALIZER_EXPRESSION_H_
+#ifndef SRC_AST_TYPE_CONSTRUCTOR_EXPRESSION_H_
+#define SRC_AST_TYPE_CONSTRUCTOR_EXPRESSION_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
 
-#include "src/ast/initializer_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/type/type.h"
 
 namespace tint {
 namespace ast {
 
-/// A type specific initializer
-class TypeInitializerExpression : public InitializerExpression {
+/// A type specific constructor
+class TypeConstructorExpression : public ConstructorExpression {
  public:
-  TypeInitializerExpression();
+  TypeConstructorExpression();
   /// Constructor
   /// @param type the type
   /// @param values the values
-  explicit TypeInitializerExpression(
+  explicit TypeConstructorExpression(
       type::Type* type,
       std::vector<std::unique_ptr<Expression>> values);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the constructor source
   /// @param type the type
-  /// @param values the initializer values
-  TypeInitializerExpression(const Source& source,
+  /// @param values the constructor values
+  TypeConstructorExpression(const Source& source,
                             type::Type* type,
                             std::vector<std::unique_ptr<Expression>> values);
   /// Move constructor
-  TypeInitializerExpression(TypeInitializerExpression&&) = default;
-  ~TypeInitializerExpression() override;
+  TypeConstructorExpression(TypeConstructorExpression&&) = default;
+  ~TypeConstructorExpression() override;
 
-  /// @returns true if this is a type initializer
-  bool IsTypeInitializer() const override { return true; }
+  /// @returns true if this is a type constructor
+  bool IsTypeConstructor() const override { return true; }
 
   /// Set the type
   /// @param type the type
@@ -74,7 +74,7 @@
   void to_str(std::ostream& out, size_t indent) const override;
 
  private:
-  TypeInitializerExpression(const TypeInitializerExpression&) = delete;
+  TypeConstructorExpression(const TypeConstructorExpression&) = delete;
 
   type::Type* type_ = nullptr;
   std::vector<std::unique_ptr<Expression>> values_;
@@ -83,4 +83,4 @@
 }  // namespace ast
 }  // namespace tint
 
-#endif  // SRC_AST_TYPE_INITIALIZER_EXPRESSION_H_
+#endif  // SRC_AST_TYPE_CONSTRUCTOR_EXPRESSION_H_
diff --git a/src/ast/type_initializer_expression_test.cc b/src/ast/type_constructor_expression_test.cc
similarity index 68%
rename from src/ast/type_initializer_expression_test.cc
rename to src/ast/type_constructor_expression_test.cc
index 80c5f98..4166995 100644
--- a/src/ast/type_initializer_expression_test.cc
+++ b/src/ast/type_constructor_expression_test.cc
@@ -12,11 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 
+#include <memory>
 #include <sstream>
+#include <vector>
 
 #include "gtest/gtest.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/type/f32_type.h"
 #include "src/ast/type/vector_type.h"
@@ -25,82 +28,82 @@
 namespace ast {
 namespace {
 
-using TypeInitializerExpressionTest = testing::Test;
+using TypeConstructorExpressionTest = testing::Test;
 
-TEST_F(TypeInitializerExpressionTest, Creation) {
+TEST_F(TypeConstructorExpressionTest, Creation) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>("expr"));
   auto expr_ptr = expr[0].get();
 
-  TypeInitializerExpression t(&f32, std::move(expr));
+  TypeConstructorExpression t(&f32, std::move(expr));
   EXPECT_EQ(t.type(), &f32);
   ASSERT_EQ(t.values().size(), 1);
   EXPECT_EQ(t.values()[0].get(), expr_ptr);
 }
 
-TEST_F(TypeInitializerExpressionTest, Creation_WithSource) {
+TEST_F(TypeConstructorExpressionTest, Creation_WithSource) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>("expr"));
 
-  TypeInitializerExpression t(Source{20, 2}, &f32, std::move(expr));
+  TypeConstructorExpression t(Source{20, 2}, &f32, std::move(expr));
   auto src = t.source();
   EXPECT_EQ(src.line, 20);
   EXPECT_EQ(src.column, 2);
 }
 
-TEST_F(TypeInitializerExpressionTest, IsTypeInitializer) {
-  TypeInitializerExpression t;
-  EXPECT_TRUE(t.IsTypeInitializer());
+TEST_F(TypeConstructorExpressionTest, IsTypeConstructor) {
+  TypeConstructorExpression t;
+  EXPECT_TRUE(t.IsTypeConstructor());
 }
 
-TEST_F(TypeInitializerExpressionTest, IsValid) {
+TEST_F(TypeConstructorExpressionTest, IsValid) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>("expr"));
 
-  TypeInitializerExpression t(&f32, std::move(expr));
+  TypeConstructorExpression t(&f32, std::move(expr));
   EXPECT_TRUE(t.IsValid());
 }
 
-TEST_F(TypeInitializerExpressionTest, IsValid_NullType) {
+TEST_F(TypeConstructorExpressionTest, IsValid_NullType) {
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>("expr"));
 
-  TypeInitializerExpression t;
+  TypeConstructorExpression t;
   t.set_values(std::move(expr));
   EXPECT_FALSE(t.IsValid());
 }
 
-TEST_F(TypeInitializerExpressionTest, IsValid_NullValue) {
+TEST_F(TypeConstructorExpressionTest, IsValid_NullValue) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>("expr"));
   expr.push_back(nullptr);
 
-  TypeInitializerExpression t(&f32, std::move(expr));
+  TypeConstructorExpression t(&f32, std::move(expr));
   EXPECT_FALSE(t.IsValid());
 }
 
-TEST_F(TypeInitializerExpressionTest, IsValid_InvalidValue) {
+TEST_F(TypeConstructorExpressionTest, IsValid_InvalidValue) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
   expr.push_back(std::make_unique<IdentifierExpression>(""));
 
-  TypeInitializerExpression t(&f32, std::move(expr));
+  TypeConstructorExpression t(&f32, std::move(expr));
   EXPECT_FALSE(t.IsValid());
 }
 
-TEST_F(TypeInitializerExpressionTest, IsValid_EmptyValue) {
+TEST_F(TypeConstructorExpressionTest, IsValid_EmptyValue) {
   type::F32Type f32;
   std::vector<std::unique_ptr<Expression>> expr;
 
-  TypeInitializerExpression t(&f32, std::move(expr));
+  TypeConstructorExpression t(&f32, std::move(expr));
   EXPECT_FALSE(t.IsValid());
 }
 
-TEST_F(TypeInitializerExpressionTest, ToStr) {
+TEST_F(TypeConstructorExpressionTest, ToStr) {
   type::F32Type f32;
   type::VectorType vec(&f32, 3);
   std::vector<std::unique_ptr<Expression>> expr;
@@ -108,10 +111,10 @@
   expr.push_back(std::make_unique<IdentifierExpression>("expr_2"));
   expr.push_back(std::make_unique<IdentifierExpression>("expr_3"));
 
-  TypeInitializerExpression t(&vec, std::move(expr));
+  TypeConstructorExpression t(&vec, std::move(expr));
   std::ostringstream out;
   t.to_str(out, 2);
-  EXPECT_EQ(out.str(), R"(  TypeInitializer{
+  EXPECT_EQ(out.str(), R"(  TypeConstructor{
     __vec_3__f32
     Identifier{expr_1}
     Identifier{expr_2}
diff --git a/src/ast/unary_derivative_expression.h b/src/ast/unary_derivative_expression.h
index d8568f2..48d592a 100644
--- a/src/ast/unary_derivative_expression.h
+++ b/src/ast/unary_derivative_expression.h
@@ -39,7 +39,7 @@
                             DerivativeModifier mod,
                             std::unique_ptr<Expression> param);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the unary derivative expression source
   /// @param op the op
   /// @param mod the derivative modifier
   /// @param param the param
diff --git a/src/ast/unary_method_expression.h b/src/ast/unary_method_expression.h
index def96cf..8e67471 100644
--- a/src/ast/unary_method_expression.h
+++ b/src/ast/unary_method_expression.h
@@ -37,7 +37,7 @@
   UnaryMethodExpression(UnaryMethod op,
                         std::vector<std::unique_ptr<Expression>> params);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the unary method source
   /// @param op the op
   /// @param params the params
   UnaryMethodExpression(const Source& source,
diff --git a/src/ast/unary_op_expression.h b/src/ast/unary_op_expression.h
index 934a95f..4b4ba3d 100644
--- a/src/ast/unary_op_expression.h
+++ b/src/ast/unary_op_expression.h
@@ -35,7 +35,7 @@
   /// @param expr the expr
   UnaryOpExpression(UnaryOp op, std::unique_ptr<Expression> expr);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the unary op expression source
   /// @param op the op
   /// @param expr the expr
   UnaryOpExpression(const Source& source,
diff --git a/src/ast/unless_statement.h b/src/ast/unless_statement.h
index 718eded..26440b4 100644
--- a/src/ast/unless_statement.h
+++ b/src/ast/unless_statement.h
@@ -36,7 +36,7 @@
   UnlessStatement(std::unique_ptr<Expression> condition,
                   std::vector<std::unique_ptr<Statement>> body);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the unless statement source
   /// @param condition the condition expression
   /// @param body the body statements
   UnlessStatement(const Source& source,
diff --git a/src/ast/variable.cc b/src/ast/variable.cc
index 9b02998..33e6b79 100644
--- a/src/ast/variable.cc
+++ b/src/ast/variable.cc
@@ -44,7 +44,7 @@
   if (type_ == nullptr) {
     return false;
   }
-  if (initializer_ && !initializer_->IsValid()) {
+  if (constructor_ && !constructor_->IsValid()) {
     return false;
   }
   return true;
@@ -59,14 +59,14 @@
   out << type_->type_name() << std::endl;
 }
 
-void Variable::initializer_to_str(std::ostream& out, size_t indent) const {
-  if (initializer_ == nullptr)
+void Variable::constructor_to_str(std::ostream& out, size_t indent) const {
+  if (constructor_ == nullptr)
     return;
 
   make_indent(out, indent);
   out << "{" << std::endl;
 
-  initializer_->to_str(out, indent + 2);
+  constructor_->to_str(out, indent + 2);
 
   make_indent(out, indent);
   out << "}" << std::endl;
@@ -76,7 +76,7 @@
   make_indent(out, indent);
   out << "Variable{" << std::endl;
   info_to_str(out, indent + 2);
-  initializer_to_str(out, indent + 2);
+  constructor_to_str(out, indent + 2);
   make_indent(out, indent);
   out << "}" << std::endl;
 }
diff --git a/src/ast/variable.h b/src/ast/variable.h
index 752296d..5a6c382 100644
--- a/src/ast/variable.h
+++ b/src/ast/variable.h
@@ -72,15 +72,15 @@
   /// @returns the storage class
   StorageClass storage_class() const { return storage_class_; }
 
-  /// Sets the initializer
-  /// @param expr the initializer expression
-  void set_initializer(std::unique_ptr<Expression> expr) {
-    initializer_ = std::move(expr);
+  /// Sets the constructor
+  /// @param expr the constructor expression
+  void set_constructor(std::unique_ptr<Expression> expr) {
+    constructor_ = std::move(expr);
   }
-  /// @returns the initializer expression or nullptr if none set
-  Expression* initializer() const { return initializer_.get(); }
-  /// @returns true if the variable has an initializer
-  bool has_initializer() const { return initializer_ != nullptr; }
+  /// @returns the constructor expression or nullptr if none set
+  Expression* constructor() const { return constructor_.get(); }
+  /// @returns true if the variable has an constructor
+  bool has_constructor() const { return constructor_ != nullptr; }
 
   /// Sets if the variable is constant
   /// @param val the value to be set
@@ -107,10 +107,10 @@
   /// @param out the stream to write to
   /// @param indent number of spaces to indent the node when writing
   void info_to_str(std::ostream& out, size_t indent) const;
-  /// Output initializer for this variable.
+  /// Output constructor for this variable.
   /// @param out the stream to write to
   /// @param indent number of spaces to indent the node when writing
-  void initializer_to_str(std::ostream& out, size_t indent) const;
+  void constructor_to_str(std::ostream& out, size_t indent) const;
 
  private:
   Variable(const Variable&) = delete;
@@ -119,7 +119,7 @@
   std::string name_;
   StorageClass storage_class_ = StorageClass::kNone;
   type::Type* type_ = nullptr;
-  std::unique_ptr<Expression> initializer_;
+  std::unique_ptr<Expression> constructor_;
 };
 
 }  // namespace ast
diff --git a/src/ast/variable_statement.h b/src/ast/variable_statement.h
index 0464369..51d2b6e 100644
--- a/src/ast/variable_statement.h
+++ b/src/ast/variable_statement.h
@@ -34,7 +34,7 @@
   /// @param variable the variable
   explicit VariableStatement(std::unique_ptr<Variable> variable);
   /// Constructor
-  /// @param source the initializer source
+  /// @param source the variable statement source
   /// @param variable the variable
   VariableStatement(const Source& source, std::unique_ptr<Variable> variable);
   /// Move constructor
diff --git a/src/ast/variable_test.cc b/src/ast/variable_test.cc
index 1a33e3f..1e4b72c 100644
--- a/src/ast/variable_test.cc
+++ b/src/ast/variable_test.cc
@@ -71,10 +71,10 @@
   EXPECT_TRUE(v.IsValid());
 }
 
-TEST_F(VariableTest, IsValid_WithInitializer) {
+TEST_F(VariableTest, IsValid_WithConstructor) {
   type::I32Type t;
   Variable v{"my_var", StorageClass::kNone, &t};
-  v.set_initializer(std::make_unique<IdentifierExpression>("ident"));
+  v.set_constructor(std::make_unique<IdentifierExpression>("ident"));
   EXPECT_TRUE(v.IsValid());
 }
 
@@ -94,10 +94,10 @@
   EXPECT_FALSE(v.IsValid());
 }
 
-TEST_F(VariableTest, IsValid_InvalidInitializer) {
+TEST_F(VariableTest, IsValid_InvalidConstructor) {
   type::I32Type t;
   Variable v{"my_var", StorageClass::kNone, &t};
-  v.set_initializer(std::make_unique<IdentifierExpression>(""));
+  v.set_constructor(std::make_unique<IdentifierExpression>(""));
   EXPECT_FALSE(v.IsValid());
 }
 
diff --git a/src/reader/wgsl/parser_impl.cc b/src/reader/wgsl/parser_impl.cc
index 70ed71f..ad795bb 100644
--- a/src/reader/wgsl/parser_impl.cc
+++ b/src/reader/wgsl/parser_impl.cc
@@ -25,7 +25,6 @@
 #include "src/ast/call_expression.h"
 #include "src/ast/case_statement.h"
 #include "src/ast/cast_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/continue_statement.h"
 #include "src/ast/decorated_variable.h"
 #include "src/ast/else_statement.h"
@@ -40,6 +39,7 @@
 #include "src/ast/nop_statement.h"
 #include "src/ast/relational_expression.h"
 #include "src/ast/return_statement.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/set_decoration.h"
 #include "src/ast/statement_condition.h"
 #include "src/ast/struct_member_offset_decoration.h"
@@ -55,7 +55,7 @@
 #include "src/ast/type/u32_type.h"
 #include "src/ast/type/vector_type.h"
 #include "src/ast/type/void_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/uint_literal.h"
 #include "src/ast/unary_derivative.h"
 #include "src/ast/unary_derivative_expression.h"
@@ -347,7 +347,7 @@
       return nullptr;
     }
 
-    var->set_initializer(std::move(expr));
+    var->set_constructor(std::move(expr));
   }
   return var;
 }
@@ -386,10 +386,10 @@
   if (has_error())
     return nullptr;
   if (init == nullptr) {
-    set_error(peek(), "error parsing constant initializer");
+    set_error(peek(), "error parsing scalar constructor");
     return nullptr;
   }
-  var->set_initializer(std::move(init));
+  var->set_constructor(std::move(init));
 
   return var;
 }
@@ -1689,18 +1689,18 @@
       return nullptr;
     }
 
-    auto initializer = logical_or_expression();
+    auto constructor = logical_or_expression();
     if (has_error())
       return nullptr;
-    if (initializer == nullptr) {
-      set_error(peek(), "missing initializer for const declaration");
+    if (constructor == nullptr) {
+      set_error(peek(), "missing constructor for const declaration");
       return nullptr;
     }
 
     auto var = std::make_unique<ast::Variable>(source, name,
                                                ast::StorageClass::kNone, type);
     var->set_is_const(true);
-    var->set_initializer(std::move(initializer));
+    var->set_constructor(std::move(constructor));
 
     return std::make_unique<ast::VariableStatement>(source, std::move(var));
   }
@@ -1714,14 +1714,14 @@
   t = peek();
   if (t.IsEqual()) {
     next();  // Consume the peek
-    auto initializer = logical_or_expression();
+    auto constructor = logical_or_expression();
     if (has_error())
       return nullptr;
-    if (initializer == nullptr) {
-      set_error(peek(), "missing initializer for variable declaration");
+    if (constructor == nullptr) {
+      set_error(peek(), "missing constructor for variable declaration");
       return nullptr;
     }
-    var->set_initializer(std::move(initializer));
+    var->set_constructor(std::move(constructor));
   }
 
   return std::make_unique<ast::VariableStatement>(source, std::move(var));
@@ -2137,7 +2137,7 @@
 // const_expr
 //   : type_decl PAREN_LEFT (const_expr COMMA)? const_expr PAREN_RIGHT
 //   | const_literal
-std::unique_ptr<ast::InitializerExpression> ParserImpl::const_expr() {
+std::unique_ptr<ast::ConstructorExpression> ParserImpl::const_expr() {
   auto t = peek();
   auto source = t.source();
 
@@ -2145,7 +2145,7 @@
   if (type != nullptr) {
     t = next();
     if (!t.IsParenLeft()) {
-      set_error(t, "missing ( for type initializer");
+      set_error(t, "missing ( for type constructor");
       return nullptr;
     }
 
@@ -2177,10 +2177,10 @@
 
     t = next();
     if (!t.IsParenRight()) {
-      set_error(t, "missing ) for type initializer");
+      set_error(t, "missing ) for type constructor");
       return nullptr;
     }
-    return std::make_unique<ast::TypeInitializerExpression>(source, type,
+    return std::make_unique<ast::TypeConstructorExpression>(source, type,
                                                             std::move(params));
   }
 
@@ -2191,8 +2191,8 @@
     set_error(peek(), "unable to parse const literal");
     return nullptr;
   }
-  return std::make_unique<ast::ConstInitializerExpression>(source,
-                                                           std::move(lit));
+  return std::make_unique<ast::ScalarConstructorExpression>(source,
+                                                            std::move(lit));
 }
 
 // primary_expression
@@ -2210,8 +2210,8 @@
   if (has_error())
     return nullptr;
   if (lit != nullptr) {
-    return std::make_unique<ast::ConstInitializerExpression>(source,
-                                                             std::move(lit));
+    return std::make_unique<ast::ScalarConstructorExpression>(source,
+                                                              std::move(lit));
   }
 
   t = peek();
@@ -2293,7 +2293,7 @@
   if (type != nullptr) {
     t = next();
     if (!t.IsParenLeft()) {
-      set_error(t, "missing ( for type initializer");
+      set_error(t, "missing ( for type constructor");
       return nullptr;
     }
 
@@ -2303,10 +2303,10 @@
 
     t = next();
     if (!t.IsParenRight()) {
-      set_error(t, "missing ) for type initializer");
+      set_error(t, "missing ) for type constructor");
       return nullptr;
     }
-    return std::make_unique<ast::TypeInitializerExpression>(source, type,
+    return std::make_unique<ast::TypeConstructorExpression>(source, type,
                                                             std::move(params));
   }
   return nullptr;
diff --git a/src/reader/wgsl/parser_impl.h b/src/reader/wgsl/parser_impl.h
index 6c8e813..22bfb7e 100644
--- a/src/reader/wgsl/parser_impl.h
+++ b/src/reader/wgsl/parser_impl.h
@@ -24,11 +24,11 @@
 
 #include "src/ast/assignment_statement.h"
 #include "src/ast/builtin.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/derivative_modifier.h"
 #include "src/ast/entry_point.h"
 #include "src/ast/function.h"
 #include "src/ast/import.h"
-#include "src/ast/initializer_expression.h"
 #include "src/ast/literal.h"
 #include "src/ast/loop_statement.h"
 #include "src/ast/module.h"
@@ -239,8 +239,8 @@
   /// @returns the const literal parsed or nullptr if none found
   std::unique_ptr<ast::Literal> const_literal();
   /// Parses a `const_expr` grammar element
-  /// @returns the parsed initializer expression or nullptr on error
-  std::unique_ptr<ast::InitializerExpression> const_expr();
+  /// @returns the parsed constructor expression or nullptr on error
+  std::unique_ptr<ast::ConstructorExpression> const_expr();
   /// Parses a `primary_expression` grammar element
   /// @returns the parsed expression or nullptr
   std::unique_ptr<ast::Expression> primary_expression();
diff --git a/src/reader/wgsl/parser_impl_additive_expression_test.cc b/src/reader/wgsl/parser_impl_additive_expression_test.cc
index 14ca2c2..db4b4a2 100644
--- a/src/reader/wgsl/parser_impl_additive_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_additive_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -62,9 +62,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_and_expression_test.cc b/src/reader/wgsl/parser_impl_and_expression_test.cc
index dac8bc9..4f55afe 100644
--- a/src/reader/wgsl/parser_impl_and_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_and_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_argument_expression_list_test.cc b/src/reader/wgsl/parser_impl_argument_expression_list_test.cc
index eac942a..3155ee8 100644
--- a/src/reader/wgsl/parser_impl_argument_expression_list_test.cc
+++ b/src/reader/wgsl/parser_impl_argument_expression_list_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/array_accessor_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/unary_derivative_expression.h"
 #include "src/ast/unary_method_expression.h"
 #include "src/ast/unary_op_expression.h"
@@ -44,7 +44,7 @@
 
   ASSERT_EQ(e.size(), 3);
   ASSERT_TRUE(e[0]->IsIdentifier());
-  ASSERT_TRUE(e[1]->IsInitializer());
+  ASSERT_TRUE(e[1]->IsConstructor());
   ASSERT_TRUE(e[2]->IsRelational());
 }
 
diff --git a/src/reader/wgsl/parser_impl_assignment_stmt_test.cc b/src/reader/wgsl/parser_impl_assignment_stmt_test.cc
index 2ef65b0..b4cc88d 100644
--- a/src/reader/wgsl/parser_impl_assignment_stmt_test.cc
+++ b/src/reader/wgsl/parser_impl_assignment_stmt_test.cc
@@ -15,11 +15,11 @@
 #include "gtest/gtest.h"
 #include "src/ast/array_accessor_expression.h"
 #include "src/ast/assignment_statement.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
 #include "src/ast/literal.h"
 #include "src/ast/member_accessor_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -43,10 +43,10 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(e->rhs()->IsInitializer());
-  ASSERT_TRUE(e->rhs()->AsInitializer()->IsConstInitializer());
+  ASSERT_TRUE(e->rhs()->IsConstructor());
+  ASSERT_TRUE(e->rhs()->AsConstructor()->IsScalarConstructor());
 
-  auto init = e->rhs()->AsInitializer()->AsConstInitializer();
+  auto init = e->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_NE(init->literal(), nullptr);
   ASSERT_TRUE(init->literal()->IsInt());
   EXPECT_EQ(init->literal()->AsInt()->value(), 123);
@@ -62,9 +62,9 @@
   ASSERT_NE(e->lhs(), nullptr);
   ASSERT_NE(e->rhs(), nullptr);
 
-  ASSERT_TRUE(e->rhs()->IsInitializer());
-  ASSERT_TRUE(e->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = e->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(e->rhs()->IsConstructor());
+  ASSERT_TRUE(e->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = e->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_NE(init->literal(), nullptr);
   ASSERT_TRUE(init->literal()->IsInt());
   EXPECT_EQ(init->literal()->AsInt()->value(), 123);
@@ -80,9 +80,9 @@
   ASSERT_TRUE(mem->structure()->IsArrayAccessor());
   auto ary = mem->structure()->AsArrayAccessor();
 
-  ASSERT_TRUE(ary->idx_expr()->IsInitializer());
-  ASSERT_TRUE(ary->idx_expr()->AsInitializer()->IsConstInitializer());
-  init = ary->idx_expr()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(ary->idx_expr()->IsConstructor());
+  ASSERT_TRUE(ary->idx_expr()->AsConstructor()->IsScalarConstructor());
+  init = ary->idx_expr()->AsConstructor()->AsScalarConstructor();
   ASSERT_NE(init->literal(), nullptr);
   ASSERT_TRUE(init->literal()->IsInt());
   EXPECT_EQ(init->literal()->AsInt()->value(), 2);
diff --git a/src/reader/wgsl/parser_impl_const_expr_test.cc b/src/reader/wgsl/parser_impl_const_expr_test.cc
index f76ee53..ca18fcf 100644
--- a/src/reader/wgsl/parser_impl_const_expr_test.cc
+++ b/src/reader/wgsl/parser_impl_const_expr_test.cc
@@ -14,10 +14,10 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/float_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -31,25 +31,25 @@
   auto e = p->const_expr();
   ASSERT_FALSE(p->has_error()) << p->error();
   ASSERT_NE(e, nullptr);
-  ASSERT_TRUE(e->IsInitializer());
-  ASSERT_TRUE(e->AsInitializer()->IsTypeInitializer());
+  ASSERT_TRUE(e->IsConstructor());
+  ASSERT_TRUE(e->AsConstructor()->IsTypeConstructor());
 
-  auto t = e->AsInitializer()->AsTypeInitializer();
+  auto t = e->AsConstructor()->AsTypeConstructor();
   ASSERT_TRUE(t->type()->IsVector());
   EXPECT_EQ(t->type()->AsVector()->size(), 2);
 
   ASSERT_EQ(t->values().size(), 2);
   auto& v = t->values();
 
-  ASSERT_TRUE(v[0]->IsInitializer());
-  ASSERT_TRUE(v[0]->AsInitializer()->IsConstInitializer());
-  auto c = v[0]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(v[0]->IsConstructor());
+  ASSERT_TRUE(v[0]->AsConstructor()->IsScalarConstructor());
+  auto c = v[0]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(c->literal()->IsFloat());
   EXPECT_FLOAT_EQ(c->literal()->AsFloat()->value(), 1.);
 
-  ASSERT_TRUE(v[1]->IsInitializer());
-  ASSERT_TRUE(v[1]->AsInitializer()->IsConstInitializer());
-  c = v[1]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(v[1]->IsConstructor());
+  ASSERT_TRUE(v[1]->AsConstructor()->IsScalarConstructor());
+  c = v[1]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(c->literal()->IsFloat());
   EXPECT_FLOAT_EQ(c->literal()->AsFloat()->value(), 2.);
 }
@@ -59,7 +59,7 @@
   auto e = p->const_expr();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:17: missing ) for type initializer");
+  EXPECT_EQ(p->error(), "1:17: missing ) for type constructor");
 }
 
 TEST_F(ParserImplTest, ConstExpr_TypeDecl_MissingLeftParen) {
@@ -67,7 +67,7 @@
   auto e = p->const_expr();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:11: missing ( for type initializer");
+  EXPECT_EQ(p->error(), "1:11: missing ( for type constructor");
 }
 
 TEST_F(ParserImplTest, ConstExpr_TypeDecl_HangingComma) {
@@ -83,7 +83,7 @@
   auto e = p->const_expr();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:14: missing ) for type initializer");
+  EXPECT_EQ(p->error(), "1:14: missing ) for type constructor");
 }
 
 TEST_F(ParserImplTest, ConstExpr_MissingExpr) {
@@ -107,9 +107,9 @@
   auto e = p->const_expr();
   ASSERT_FALSE(p->has_error()) << p->error();
   ASSERT_NE(e, nullptr);
-  ASSERT_TRUE(e->IsInitializer());
-  ASSERT_TRUE(e->AsInitializer()->IsConstInitializer());
-  auto c = e->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(e->IsConstructor());
+  ASSERT_TRUE(e->AsConstructor()->IsScalarConstructor());
+  auto c = e->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(c->literal()->IsBool());
   EXPECT_TRUE(c->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_equality_expression_test.cc b/src/reader/wgsl/parser_impl_equality_expression_test.cc
index a0ec16d..7193229 100644
--- a/src/reader/wgsl/parser_impl_equality_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_equality_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -62,9 +62,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_exclusive_or_expression_test.cc b/src/reader/wgsl/parser_impl_exclusive_or_expression_test.cc
index 66ef301..626a9ac 100644
--- a/src/reader/wgsl/parser_impl_exclusive_or_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_exclusive_or_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_global_constant_decl_test.cc b/src/reader/wgsl/parser_impl_global_constant_decl_test.cc
index d006297..3f53a04 100644
--- a/src/reader/wgsl/parser_impl_global_constant_decl_test.cc
+++ b/src/reader/wgsl/parser_impl_global_constant_decl_test.cc
@@ -34,8 +34,8 @@
   ASSERT_NE(e->type(), nullptr);
   EXPECT_TRUE(e->type()->IsF32());
 
-  ASSERT_NE(e->initializer(), nullptr);
-  EXPECT_TRUE(e->initializer()->IsInitializer());
+  ASSERT_NE(e->constructor(), nullptr);
+  EXPECT_TRUE(e->constructor()->IsConstructor());
 }
 
 TEST_F(ParserImplTest, GlobalConstantDecl_MissingEqual) {
diff --git a/src/reader/wgsl/parser_impl_global_variable_decl_test.cc b/src/reader/wgsl/parser_impl_global_variable_decl_test.cc
index b65d697..d7ff3c6 100644
--- a/src/reader/wgsl/parser_impl_global_variable_decl_test.cc
+++ b/src/reader/wgsl/parser_impl_global_variable_decl_test.cc
@@ -23,7 +23,7 @@
 namespace wgsl {
 namespace {
 
-TEST_F(ParserImplTest, GlobalVariableDecl_WithoutInitializer) {
+TEST_F(ParserImplTest, GlobalVariableDecl_WithoutConstructor) {
   auto p = parser("var<out> a : f32");
   auto e = p->global_variable_decl();
   ASSERT_FALSE(p->has_error()) << p->error();
@@ -33,11 +33,11 @@
   EXPECT_TRUE(e->type()->IsF32());
   EXPECT_EQ(e->storage_class(), ast::StorageClass::kOutput);
 
-  ASSERT_EQ(e->initializer(), nullptr);
+  ASSERT_EQ(e->constructor(), nullptr);
   ASSERT_FALSE(e->IsDecorated());
 }
 
-TEST_F(ParserImplTest, GlobalVariableDecl_WithInitializer) {
+TEST_F(ParserImplTest, GlobalVariableDecl_WithConstructor) {
   auto p = parser("var<out> a : f32 = 1.");
   auto e = p->global_variable_decl();
   ASSERT_FALSE(p->has_error()) << p->error();
@@ -47,9 +47,9 @@
   EXPECT_TRUE(e->type()->IsF32());
   EXPECT_EQ(e->storage_class(), ast::StorageClass::kOutput);
 
-  ASSERT_NE(e->initializer(), nullptr);
-  ASSERT_TRUE(e->initializer()->IsInitializer());
-  ASSERT_TRUE(e->initializer()->AsInitializer()->IsConstInitializer());
+  ASSERT_NE(e->constructor(), nullptr);
+  ASSERT_TRUE(e->constructor()->IsConstructor());
+  ASSERT_TRUE(e->constructor()->AsConstructor()->IsScalarConstructor());
 
   ASSERT_FALSE(e->IsDecorated());
 }
@@ -66,7 +66,7 @@
   EXPECT_TRUE(e->type()->IsF32());
   EXPECT_EQ(e->storage_class(), ast::StorageClass::kOutput);
 
-  ASSERT_EQ(e->initializer(), nullptr);
+  ASSERT_EQ(e->constructor(), nullptr);
 
   ASSERT_TRUE(e->IsDecorated());
   auto v = e->AsDecorated();
diff --git a/src/reader/wgsl/parser_impl_inclusive_or_expression_test.cc b/src/reader/wgsl/parser_impl_inclusive_or_expression_test.cc
index 34ba2b0..4bd9c44 100644
--- a/src/reader/wgsl/parser_impl_inclusive_or_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_inclusive_or_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_logical_and_expression_test.cc b/src/reader/wgsl/parser_impl_logical_and_expression_test.cc
index 4ae2510..9483649 100644
--- a/src/reader/wgsl/parser_impl_logical_and_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_logical_and_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_logical_or_expression_test.cc b/src/reader/wgsl/parser_impl_logical_or_expression_test.cc
index c7e1468..3fb303a 100644
--- a/src/reader/wgsl/parser_impl_logical_or_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_logical_or_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_multiplicative_expression_test.cc b/src/reader/wgsl/parser_impl_multiplicative_expression_test.cc
index e46e47f..9d6e2f7 100644
--- a/src/reader/wgsl/parser_impl_multiplicative_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_multiplicative_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -62,9 +62,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -84,9 +84,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_postfix_expression_test.cc b/src/reader/wgsl/parser_impl_postfix_expression_test.cc
index 74dea91..a9c63e9 100644
--- a/src/reader/wgsl/parser_impl_postfix_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_postfix_expression_test.cc
@@ -15,10 +15,10 @@
 #include "gtest/gtest.h"
 #include "src/ast/array_accessor_expression.h"
 #include "src/ast/call_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
 #include "src/ast/member_accessor_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/unary_derivative_expression.h"
 #include "src/ast/unary_method_expression.h"
 #include "src/ast/unary_op_expression.h"
@@ -44,9 +44,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(ary->idx_expr()->IsInitializer());
-  ASSERT_TRUE(ary->idx_expr()->AsInitializer()->IsConstInitializer());
-  auto c = ary->idx_expr()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(ary->idx_expr()->IsConstructor());
+  ASSERT_TRUE(ary->idx_expr()->AsConstructor()->IsScalarConstructor());
+  auto c = ary->idx_expr()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(c->literal()->IsInt());
   EXPECT_EQ(c->literal()->AsInt()->value(), 1);
 }
@@ -125,7 +125,7 @@
   EXPECT_EQ(func->name()[1], "test");
 
   EXPECT_EQ(c->params().size(), 3);
-  EXPECT_TRUE(c->params()[0]->IsInitializer());
+  EXPECT_TRUE(c->params()[0]->IsConstructor());
   EXPECT_TRUE(c->params()[1]->IsIdentifier());
   EXPECT_TRUE(c->params()[2]->IsRelational());
 }
diff --git a/src/reader/wgsl/parser_impl_primary_expression_test.cc b/src/reader/wgsl/parser_impl_primary_expression_test.cc
index a6c2478..0ce6138 100644
--- a/src/reader/wgsl/parser_impl_primary_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_primary_expression_test.cc
@@ -17,12 +17,12 @@
 #include "src/ast/as_expression.h"
 #include "src/ast/bool_literal.h"
 #include "src/ast/cast_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/f32_type.h"
 #include "src/ast/type/i32_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/unary_derivative_expression.h"
 #include "src/ast/unary_method_expression.h"
 #include "src/ast/unary_op_expression.h"
@@ -73,33 +73,33 @@
   auto e = p->primary_expression();
   ASSERT_FALSE(p->has_error()) << p->error();
   ASSERT_NE(e, nullptr);
-  ASSERT_TRUE(e->IsInitializer());
-  ASSERT_TRUE(e->AsInitializer()->IsTypeInitializer());
-  auto ty = e->AsInitializer()->AsTypeInitializer();
+  ASSERT_TRUE(e->IsConstructor());
+  ASSERT_TRUE(e->AsConstructor()->IsTypeConstructor());
+  auto ty = e->AsConstructor()->AsTypeConstructor();
 
   ASSERT_EQ(ty->values().size(), 4);
   const auto& val = ty->values();
-  ASSERT_TRUE(val[0]->IsInitializer());
-  ASSERT_TRUE(val[0]->AsInitializer()->IsConstInitializer());
-  auto ident = val[0]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(val[0]->IsConstructor());
+  ASSERT_TRUE(val[0]->AsConstructor()->IsScalarConstructor());
+  auto ident = val[0]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(ident->literal()->IsInt());
   EXPECT_EQ(ident->literal()->AsInt()->value(), 1);
 
-  ASSERT_TRUE(val[1]->IsInitializer());
-  ASSERT_TRUE(val[1]->AsInitializer()->IsConstInitializer());
-  ident = val[1]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(val[1]->IsConstructor());
+  ASSERT_TRUE(val[1]->AsConstructor()->IsScalarConstructor());
+  ident = val[1]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(ident->literal()->IsInt());
   EXPECT_EQ(ident->literal()->AsInt()->value(), 2);
 
-  ASSERT_TRUE(val[2]->IsInitializer());
-  ASSERT_TRUE(val[2]->AsInitializer()->IsConstInitializer());
-  ident = val[2]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(val[2]->IsConstructor());
+  ASSERT_TRUE(val[2]->AsConstructor()->IsScalarConstructor());
+  ident = val[2]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(ident->literal()->IsInt());
   EXPECT_EQ(ident->literal()->AsInt()->value(), 3);
 
-  ASSERT_TRUE(val[3]->IsInitializer());
-  ASSERT_TRUE(val[3]->AsInitializer()->IsConstInitializer());
-  ident = val[3]->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(val[3]->IsConstructor());
+  ASSERT_TRUE(val[3]->AsConstructor()->IsScalarConstructor());
+  ident = val[3]->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(ident->literal()->IsInt());
   EXPECT_EQ(ident->literal()->AsInt()->value(), 4);
 }
@@ -117,7 +117,7 @@
   auto e = p->primary_expression();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:11: missing ( for type initializer");
+  EXPECT_EQ(p->error(), "1:11: missing ( for type constructor");
 }
 
 TEST_F(ParserImplTest, PrimaryExpression_TypeDecl_MissingRightParen) {
@@ -125,7 +125,7 @@
   auto e = p->primary_expression();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:25: missing ) for type initializer");
+  EXPECT_EQ(p->error(), "1:25: missing ) for type constructor");
 }
 
 TEST_F(ParserImplTest, PrimaryExpression_TypeDecl_InvalidValue) {
@@ -141,9 +141,9 @@
   auto e = p->primary_expression();
   ASSERT_FALSE(p->has_error());
   ASSERT_NE(e, nullptr);
-  ASSERT_TRUE(e->IsInitializer());
-  ASSERT_TRUE(e->AsInitializer()->IsConstInitializer());
-  auto init = e->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(e->IsConstructor());
+  ASSERT_TRUE(e->AsConstructor()->IsScalarConstructor());
+  auto init = e->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   EXPECT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -192,8 +192,8 @@
   auto c = e->AsCast();
   ASSERT_EQ(c->type(), f32_type);
 
-  ASSERT_TRUE(c->expr()->IsInitializer());
-  ASSERT_TRUE(c->expr()->AsInitializer()->IsConstInitializer());
+  ASSERT_TRUE(c->expr()->IsConstructor());
+  ASSERT_TRUE(c->expr()->AsConstructor()->IsScalarConstructor());
 }
 
 TEST_F(ParserImplTest, PrimaryExpression_Cast_MissingGreaterThan) {
@@ -264,8 +264,8 @@
   auto c = e->AsAs();
   ASSERT_EQ(c->type(), f32_type);
 
-  ASSERT_TRUE(c->expr()->IsInitializer());
-  ASSERT_TRUE(c->expr()->AsInitializer()->IsConstInitializer());
+  ASSERT_TRUE(c->expr()->IsConstructor());
+  ASSERT_TRUE(c->expr()->AsConstructor()->IsScalarConstructor());
 }
 
 TEST_F(ParserImplTest, PrimaryExpression_As_MissingGreaterThan) {
diff --git a/src/reader/wgsl/parser_impl_relational_expression_test.cc b/src/reader/wgsl/parser_impl_relational_expression_test.cc
index b7a41d6..5673535 100644
--- a/src/reader/wgsl/parser_impl_relational_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_relational_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -62,9 +62,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -84,9 +84,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -106,9 +106,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_shift_expression_test.cc b/src/reader/wgsl/parser_impl_shift_expression_test.cc
index 0fd54b9..76f5270 100644
--- a/src/reader/wgsl/parser_impl_shift_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_shift_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/reader/wgsl/parser_impl.h"
 #include "src/reader/wgsl/parser_impl_test_helper.h"
 
@@ -40,9 +40,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -62,9 +62,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
@@ -84,9 +84,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(rel->rhs()->IsInitializer());
-  ASSERT_TRUE(rel->rhs()->AsInitializer()->IsConstInitializer());
-  auto init = rel->rhs()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(rel->rhs()->IsConstructor());
+  ASSERT_TRUE(rel->rhs()->AsConstructor()->IsScalarConstructor());
+  auto init = rel->rhs()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsBool());
   ASSERT_TRUE(init->literal()->AsBool()->IsTrue());
 }
diff --git a/src/reader/wgsl/parser_impl_statement_test.cc b/src/reader/wgsl/parser_impl_statement_test.cc
index 3a4d846..51082cc 100644
--- a/src/reader/wgsl/parser_impl_statement_test.cc
+++ b/src/reader/wgsl/parser_impl_statement_test.cc
@@ -138,7 +138,7 @@
   auto e = p->statement();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:14: missing initializer for variable declaration");
+  EXPECT_EQ(p->error(), "1:14: missing constructor for variable declaration");
 }
 
 TEST_F(ParserImplTest, Statement_Variable_MissingSemicolon) {
diff --git a/src/reader/wgsl/parser_impl_unary_expression_test.cc b/src/reader/wgsl/parser_impl_unary_expression_test.cc
index 37ac9cf..090c9af 100644
--- a/src/reader/wgsl/parser_impl_unary_expression_test.cc
+++ b/src/reader/wgsl/parser_impl_unary_expression_test.cc
@@ -14,9 +14,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/array_accessor_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/unary_derivative_expression.h"
 #include "src/ast/unary_method_expression.h"
 #include "src/ast/unary_op_expression.h"
@@ -41,9 +41,9 @@
   ASSERT_EQ(ident->name().size(), 1);
   EXPECT_EQ(ident->name()[0], "a");
 
-  ASSERT_TRUE(ary->idx_expr()->IsInitializer());
-  ASSERT_TRUE(ary->idx_expr()->AsInitializer()->IsConstInitializer());
-  auto init = ary->idx_expr()->AsInitializer()->AsConstInitializer();
+  ASSERT_TRUE(ary->idx_expr()->IsConstructor());
+  ASSERT_TRUE(ary->idx_expr()->AsConstructor()->IsScalarConstructor());
+  auto init = ary->idx_expr()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsInt());
   ASSERT_EQ(init->literal()->AsInt()->value(), 2);
 }
@@ -58,10 +58,10 @@
   auto u = e->AsUnaryOp();
   ASSERT_EQ(u->op(), ast::UnaryOp::kNegation);
 
-  ASSERT_TRUE(u->expr()->IsInitializer());
-  ASSERT_TRUE(u->expr()->AsInitializer()->IsConstInitializer());
+  ASSERT_TRUE(u->expr()->IsConstructor());
+  ASSERT_TRUE(u->expr()->AsConstructor()->IsScalarConstructor());
 
-  auto init = u->expr()->AsInitializer()->AsConstInitializer();
+  auto init = u->expr()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsInt());
   EXPECT_EQ(init->literal()->AsInt()->value(), 1);
 }
@@ -84,10 +84,10 @@
   auto u = e->AsUnaryOp();
   ASSERT_EQ(u->op(), ast::UnaryOp::kNot);
 
-  ASSERT_TRUE(u->expr()->IsInitializer());
-  ASSERT_TRUE(u->expr()->AsInitializer()->IsConstInitializer());
+  ASSERT_TRUE(u->expr()->IsConstructor());
+  ASSERT_TRUE(u->expr()->AsConstructor()->IsScalarConstructor());
 
-  auto init = u->expr()->AsInitializer()->AsConstInitializer();
+  auto init = u->expr()->AsConstructor()->AsScalarConstructor();
   ASSERT_TRUE(init->literal()->IsInt());
   EXPECT_EQ(init->literal()->AsInt()->value(), 1);
 }
diff --git a/src/reader/wgsl/parser_impl_variable_stmt_test.cc b/src/reader/wgsl/parser_impl_variable_stmt_test.cc
index 10b5728..8777380 100644
--- a/src/reader/wgsl/parser_impl_variable_stmt_test.cc
+++ b/src/reader/wgsl/parser_impl_variable_stmt_test.cc
@@ -32,7 +32,7 @@
   ASSERT_NE(e->variable(), nullptr);
   EXPECT_EQ(e->variable()->name(), "a");
 
-  EXPECT_EQ(e->variable()->initializer(), nullptr);
+  EXPECT_EQ(e->variable()->constructor(), nullptr);
 }
 
 TEST_F(ParserImplTest, VariableStmt_VariableDecl_WithInit) {
@@ -44,8 +44,8 @@
   ASSERT_NE(e->variable(), nullptr);
   EXPECT_EQ(e->variable()->name(), "a");
 
-  ASSERT_NE(e->variable()->initializer(), nullptr);
-  EXPECT_TRUE(e->variable()->initializer()->IsInitializer());
+  ASSERT_NE(e->variable()->constructor(), nullptr);
+  EXPECT_TRUE(e->variable()->constructor()->IsConstructor());
 }
 
 TEST_F(ParserImplTest, VariableStmt_VariableDecl_Invalid) {
@@ -56,12 +56,12 @@
   EXPECT_EQ(p->error(), "1:9: unknown type alias 'invalid'");
 }
 
-TEST_F(ParserImplTest, VariableStmt_VariableDecl_InitializerInvalid) {
+TEST_F(ParserImplTest, VariableStmt_VariableDecl_ConstructorInvalid) {
   auto p = parser("var a : i32 = if(a) {}");
   auto e = p->variable_stmt();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:15: missing initializer for variable declaration");
+  EXPECT_EQ(p->error(), "1:15: missing constructor for variable declaration");
 }
 
 TEST_F(ParserImplTest, VariableStmt_Const) {
@@ -88,20 +88,20 @@
   EXPECT_EQ(p->error(), "1:15: missing = for constant declaration");
 }
 
-TEST_F(ParserImplTest, VariableStmt_Const_MissingInitializer) {
+TEST_F(ParserImplTest, VariableStmt_Const_MissingConstructor) {
   auto p = parser("const a : i32 =");
   auto e = p->variable_stmt();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:16: missing initializer for const declaration");
+  EXPECT_EQ(p->error(), "1:16: missing constructor for const declaration");
 }
 
-TEST_F(ParserImplTest, VariableStmt_Const_InvalidInitializer) {
+TEST_F(ParserImplTest, VariableStmt_Const_InvalidConstructor) {
   auto p = parser("const a : i32 = if (a) {}");
   auto e = p->variable_stmt();
   ASSERT_TRUE(p->has_error());
   ASSERT_EQ(e, nullptr);
-  EXPECT_EQ(p->error(), "1:17: missing initializer for const declaration");
+  EXPECT_EQ(p->error(), "1:17: missing constructor for const declaration");
 }
 
 }  // namespace
diff --git a/src/writer/spirv/builder.cc b/src/writer/spirv/builder.cc
index 32b0d98..d0e10eb 100644
--- a/src/writer/spirv/builder.cc
+++ b/src/writer/spirv/builder.cc
@@ -20,13 +20,13 @@
 #include "src/ast/binding_decoration.h"
 #include "src/ast/bool_literal.h"
 #include "src/ast/builtin_decoration.h"
-#include "src/ast/const_initializer_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/decorated_variable.h"
 #include "src/ast/float_literal.h"
-#include "src/ast/initializer_expression.h"
 #include "src/ast/int_literal.h"
 #include "src/ast/location_decoration.h"
 #include "src/ast/return_statement.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/set_decoration.h"
 #include "src/ast/struct.h"
 #include "src/ast/struct_member.h"
@@ -37,7 +37,7 @@
 #include "src/ast/type/struct_type.h"
 #include "src/ast/type/u32_type.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/uint_literal.h"
 
 namespace tint {
@@ -173,8 +173,8 @@
 }
 
 uint32_t Builder::GenerateExpression(ast::Expression* expr) {
-  if (expr->IsInitializer()) {
-    return GenerateInitializerExpression(expr->AsInitializer(), false);
+  if (expr->IsConstructor()) {
+    return GenerateConstructorExpression(expr->AsConstructor(), false);
   }
 
   error_ = "unknown expression type";
@@ -239,13 +239,13 @@
 
 bool Builder::GenerateGlobalVariable(ast::Variable* var) {
   uint32_t init_id = 0;
-  if (var->has_initializer()) {
-    if (!var->initializer()->IsInitializer()) {
-      error_ = "constant initializer expected";
+  if (var->has_constructor()) {
+    if (!var->constructor()->IsConstructor()) {
+      error_ = "scalar constructor expected";
       return false;
     }
 
-    init_id = GenerateInitializerExpression(var->initializer()->AsInitializer(),
+    init_id = GenerateConstructorExpression(var->constructor()->AsConstructor(),
                                             true);
     if (init_id == 0) {
       return false;
@@ -253,8 +253,8 @@
   }
 
   if (var->is_const()) {
-    if (!var->has_initializer()) {
-      error_ = "missing initializer for constant";
+    if (!var->has_constructor()) {
+      error_ = "missing constructor for constant";
       return false;
     }
 
@@ -280,7 +280,7 @@
 
   std::vector<Operand> ops = {Operand::Int(type_id), result,
                               Operand::Int(ConvertStorageClass(sc))};
-  if (var->has_initializer()) {
+  if (var->has_constructor()) {
     ops.push_back(Operand::Int(init_id));
   }
 
@@ -327,14 +327,14 @@
   import_name_to_id_[imp->name()] = id;
 }
 
-uint32_t Builder::GenerateInitializerExpression(
-    ast::InitializerExpression* expr,
+uint32_t Builder::GenerateConstructorExpression(
+    ast::ConstructorExpression* expr,
     bool is_global_init) {
-  if (expr->IsConstInitializer()) {
-    return GenerateLiteralIfNeeded(expr->AsConstInitializer()->literal());
+  if (expr->IsScalarConstructor()) {
+    return GenerateLiteralIfNeeded(expr->AsScalarConstructor()->literal());
   }
-  if (expr->IsTypeInitializer()) {
-    auto init = expr->AsTypeInitializer();
+  if (expr->IsTypeConstructor()) {
+    auto init = expr->AsTypeConstructor();
     auto type_id = GenerateTypeIfNeeded(init->type());
     if (type_id == 0) {
       return 0;
@@ -345,12 +345,12 @@
 
     std::vector<Operand> ops;
     for (const auto& e : init->values()) {
-      if (is_global_init && !e->IsInitializer()) {
-        error_ = "initializer must be a constant expression";
+      if (is_global_init && !e->IsConstructor()) {
+        error_ = "constructor must be a constant expression";
         return 0;
       }
       auto id =
-          GenerateInitializerExpression(e->AsInitializer(), is_global_init);
+          GenerateConstructorExpression(e->AsConstructor(), is_global_init);
       if (id == 0) {
         return 0;
       }
@@ -375,7 +375,7 @@
     return result.to_i();
   }
 
-  error_ = "unknown initializer expression";
+  error_ = "unknown constructor expression";
   return 0;
 }
 
diff --git a/src/writer/spirv/builder.h b/src/writer/spirv/builder.h
index a7429bb..79082d7 100644
--- a/src/writer/spirv/builder.h
+++ b/src/writer/spirv/builder.h
@@ -156,11 +156,11 @@
   /// Generates an import instruction
   /// @param imp the import
   void GenerateImport(ast::Import* imp);
-  /// Generates an initializer expression
+  /// Generates an constructor expression
   /// @param expr the expression to generate
-  /// @param is_global_init set true if this is a global variable initializer
+  /// @param is_global_init set true if this is a global variable constructor
   /// @returns the ID of the expression or 0 on failure.
-  uint32_t GenerateInitializerExpression(ast::InitializerExpression* expr,
+  uint32_t GenerateConstructorExpression(ast::ConstructorExpression* expr,
                                          bool is_global_init);
   /// Generates a literal constant if needed
   /// @param lit the literal to generate
diff --git a/src/writer/spirv/builder_initializer_expression_test.cc b/src/writer/spirv/builder_constructor_expression_test.cc
similarity index 65%
rename from src/writer/spirv/builder_initializer_expression_test.cc
rename to src/writer/spirv/builder_constructor_expression_test.cc
index 443493f..51bb271 100644
--- a/src/writer/spirv/builder_initializer_expression_test.cc
+++ b/src/writer/spirv/builder_constructor_expression_test.cc
@@ -17,12 +17,12 @@
 #include "gtest/gtest.h"
 #include "spirv/unified1/spirv.h"
 #include "spirv/unified1/spirv.hpp11"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/relational_expression.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/f32_type.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/writer/spirv/builder.h"
 #include "src/writer/spirv/spv_dump.h"
 
@@ -33,13 +33,13 @@
 
 using BuilderTest = testing::Test;
 
-TEST_F(BuilderTest, Initializer_Const) {
+TEST_F(BuilderTest, Constructor_Const) {
   ast::type::F32Type f32;
   auto fl = std::make_unique<ast::FloatLiteral>(&f32, 42.2f);
-  ast::ConstInitializerExpression c(std::move(fl));
+  ast::ScalarConstructorExpression c(std::move(fl));
 
   Builder b;
-  EXPECT_EQ(b.GenerateInitializerExpression(&c, true), 2);
+  EXPECT_EQ(b.GenerateConstructorExpression(&c, true), 2);
   ASSERT_FALSE(b.has_error()) << b.error();
 
   EXPECT_EQ(DumpInstructions(b.types()), R"(%1 = OpTypeFloat 32
@@ -47,22 +47,22 @@
 )");
 }
 
-TEST_F(BuilderTest, Initializer_Type) {
+TEST_F(BuilderTest, Constructor_Type) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 3);
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
-  ast::TypeInitializerExpression t(&vec, std::move(vals));
+  ast::TypeConstructorExpression t(&vec, std::move(vals));
 
   Builder b;
-  EXPECT_EQ(b.GenerateInitializerExpression(&t, true), 5);
+  EXPECT_EQ(b.GenerateConstructorExpression(&t, true), 5);
   ASSERT_FALSE(b.has_error()) << b.error();
 
   EXPECT_EQ(DumpInstructions(b.types()), R"(%2 = OpTypeFloat 32
@@ -73,47 +73,47 @@
 )");
 }
 
-TEST_F(BuilderTest, Initializer_Type_Dedups) {
+TEST_F(BuilderTest, Constructor_Type_Dedups) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 3);
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
-  ast::TypeInitializerExpression t(&vec, std::move(vals));
+  ast::TypeConstructorExpression t(&vec, std::move(vals));
 
   Builder b;
-  EXPECT_EQ(b.GenerateInitializerExpression(&t, true), 5);
-  EXPECT_EQ(b.GenerateInitializerExpression(&t, true), 5);
+  EXPECT_EQ(b.GenerateConstructorExpression(&t, true), 5);
+  EXPECT_EQ(b.GenerateConstructorExpression(&t, true), 5);
   ASSERT_FALSE(b.has_error()) << b.error();
 }
 
-TEST_F(BuilderTest, Initializer_NonConst_Type_Fails) {
+TEST_F(BuilderTest, Constructor_NonConst_Type_Fails) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 2);
   auto rel = std::make_unique<ast::RelationalExpression>(
       ast::Relation::kAdd,
-      std::make_unique<ast::ConstInitializerExpression>(
+      std::make_unique<ast::ScalarConstructorExpression>(
           std::make_unique<ast::FloatLiteral>(&f32, 3.0f)),
-      std::make_unique<ast::ConstInitializerExpression>(
+      std::make_unique<ast::ScalarConstructorExpression>(
           std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
   vals.push_back(std::move(rel));
 
-  ast::TypeInitializerExpression t(&vec, std::move(vals));
+  ast::TypeConstructorExpression t(&vec, std::move(vals));
 
   Builder b;
-  EXPECT_EQ(b.GenerateInitializerExpression(&t, true), 0);
+  EXPECT_EQ(b.GenerateConstructorExpression(&t, true), 0);
   EXPECT_TRUE(b.has_error());
-  EXPECT_EQ(b.error(), R"(initializer must be a constant expression)");
+  EXPECT_EQ(b.error(), R"(constructor must be a constant expression)");
 }
 
 }  // namespace
diff --git a/src/writer/spirv/builder_global_variable_test.cc b/src/writer/spirv/builder_global_variable_test.cc
index 0a66899..3f2deac 100644
--- a/src/writer/spirv/builder_global_variable_test.cc
+++ b/src/writer/spirv/builder_global_variable_test.cc
@@ -18,15 +18,15 @@
 #include "src/ast/binding_decoration.h"
 #include "src/ast/builtin.h"
 #include "src/ast/builtin_decoration.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/decorated_variable.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/location_decoration.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/set_decoration.h"
 #include "src/ast/storage_class.h"
 #include "src/ast/type/f32_type.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/variable.h"
 #include "src/ast/variable_decoration.h"
 #include "src/writer/spirv/builder.h"
@@ -67,23 +67,23 @@
 )");
 }
 
-TEST_F(BuilderTest, GlobalVar_WithInitializer) {
+TEST_F(BuilderTest, GlobalVar_WithConstructor) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 3);
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
   auto init =
-      std::make_unique<ast::TypeInitializerExpression>(&vec, std::move(vals));
+      std::make_unique<ast::TypeConstructorExpression>(&vec, std::move(vals));
 
   ast::Variable v("var", ast::StorageClass::kOutput, &f32);
-  v.set_initializer(std::move(init));
+  v.set_constructor(std::move(init));
 
   Builder b;
   EXPECT_TRUE(b.GenerateGlobalVariable(&v)) << b.error();
@@ -106,18 +106,18 @@
   ast::type::VectorType vec(&f32, 3);
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
   auto init =
-      std::make_unique<ast::TypeInitializerExpression>(&vec, std::move(vals));
+      std::make_unique<ast::TypeConstructorExpression>(&vec, std::move(vals));
 
   ast::Variable v("var", ast::StorageClass::kOutput, &f32);
-  v.set_initializer(std::move(init));
+  v.set_constructor(std::move(init));
   v.set_is_const(true);
 
   Builder b;
diff --git a/src/writer/spirv/builder_return_test.cc b/src/writer/spirv/builder_return_test.cc
index 57134e6..038bbb7 100644
--- a/src/writer/spirv/builder_return_test.cc
+++ b/src/writer/spirv/builder_return_test.cc
@@ -15,12 +15,12 @@
 #include <memory>
 
 #include "gtest/gtest.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/return_statement.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/f32_type.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/writer/spirv/builder.h"
 #include "src/writer/spirv/spv_dump.h"
 
@@ -47,15 +47,15 @@
   ast::type::VectorType vec(&f32, 3);
 
   std::vector<std::unique_ptr<ast::Expression>> vals;
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
-  vals.push_back(std::make_unique<ast::ConstInitializerExpression>(
+  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
       std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
 
   auto val =
-      std::make_unique<ast::TypeInitializerExpression>(&vec, std::move(vals));
+      std::make_unique<ast::TypeConstructorExpression>(&vec, std::move(vals));
 
   ast::ReturnStatement ret(std::move(val));
 
diff --git a/src/writer/wgsl/generator_impl.cc b/src/writer/wgsl/generator_impl.cc
index c288b9d..d7bbf89 100644
--- a/src/writer/wgsl/generator_impl.cc
+++ b/src/writer/wgsl/generator_impl.cc
@@ -27,14 +27,13 @@
 #include "src/ast/call_expression.h"
 #include "src/ast/case_statement.h"
 #include "src/ast/cast_expression.h"
-#include "src/ast/const_initializer_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/continue_statement.h"
 #include "src/ast/decorated_variable.h"
 #include "src/ast/else_statement.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/if_statement.h"
-#include "src/ast/initializer_expression.h"
 #include "src/ast/int_literal.h"
 #include "src/ast/location_decoration.h"
 #include "src/ast/loop_statement.h"
@@ -42,6 +41,7 @@
 #include "src/ast/regardless_statement.h"
 #include "src/ast/relational_expression.h"
 #include "src/ast/return_statement.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/set_decoration.h"
 #include "src/ast/statement.h"
 #include "src/ast/struct.h"
@@ -53,7 +53,7 @@
 #include "src/ast/type/pointer_type.h"
 #include "src/ast/type/struct_type.h"
 #include "src/ast/type/vector_type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/uint_literal.h"
 #include "src/ast/unary_derivative_expression.h"
 #include "src/ast/unary_method_expression.h"
@@ -158,8 +158,8 @@
   if (expr->IsIdentifier()) {
     return EmitIdentifier(expr->AsIdentifier());
   }
-  if (expr->IsInitializer()) {
-    return EmitInitializer(expr->AsInitializer());
+  if (expr->IsConstructor()) {
+    return EmitConstructor(expr->AsConstructor());
   }
   if (expr->IsMemberAccessor()) {
     return EmitMemberAccessor(expr->AsMemberAccessor());
@@ -259,14 +259,14 @@
   return true;
 }
 
-bool GeneratorImpl::EmitInitializer(ast::InitializerExpression* expr) {
-  if (expr->IsConstInitializer()) {
-    return EmitConstInitializer(expr->AsConstInitializer());
+bool GeneratorImpl::EmitConstructor(ast::ConstructorExpression* expr) {
+  if (expr->IsScalarConstructor()) {
+    return EmitScalarConstructor(expr->AsScalarConstructor());
   }
-  return EmitTypeInitializer(expr->AsTypeInitializer());
+  return EmitTypeConstructor(expr->AsTypeConstructor());
 }
 
-bool GeneratorImpl::EmitTypeInitializer(ast::TypeInitializerExpression* expr) {
+bool GeneratorImpl::EmitTypeConstructor(ast::TypeConstructorExpression* expr) {
   if (!EmitType(expr->type())) {
     return false;
   }
@@ -289,8 +289,8 @@
   return true;
 }
 
-bool GeneratorImpl::EmitConstInitializer(
-    ast::ConstInitializerExpression* expr) {
+bool GeneratorImpl::EmitScalarConstructor(
+    ast::ScalarConstructorExpression* expr) {
   return EmitLiteral(expr->literal());
 }
 
@@ -480,9 +480,9 @@
     return false;
   }
 
-  if (var->initializer() != nullptr) {
+  if (var->constructor() != nullptr) {
     out_ << " = ";
-    if (!EmitExpression(var->initializer())) {
+    if (!EmitExpression(var->constructor())) {
       return false;
     }
   }
diff --git a/src/writer/wgsl/generator_impl.h b/src/writer/wgsl/generator_impl.h
index 8ec4572..d8b26b3 100644
--- a/src/writer/wgsl/generator_impl.h
+++ b/src/writer/wgsl/generator_impl.h
@@ -21,15 +21,15 @@
 #include <vector>
 
 #include "src/ast/array_accessor_expression.h"
-#include "src/ast/const_initializer_expression.h"
+#include "src/ast/constructor_expression.h"
 #include "src/ast/entry_point.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/import.h"
-#include "src/ast/initializer_expression.h"
 #include "src/ast/module.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/alias_type.h"
 #include "src/ast/type/type.h"
-#include "src/ast/type_initializer_expression.h"
+#include "src/ast/type_constructor_expression.h"
 #include "src/ast/variable.h"
 
 namespace tint {
@@ -100,10 +100,10 @@
   /// @param expr the cast expression
   /// @returns true if the cast was emitted
   bool EmitCast(ast::CastExpression* expr);
-  /// Handles generating a const initializer
-  /// @param expr the const initializer expression
-  /// @returns true if the initializer is emitted
-  bool EmitConstInitializer(ast::ConstInitializerExpression* expr);
+  /// Handles generating a scalar constructor
+  /// @param expr the scalar constructor expression
+  /// @returns true if the scalar constructor is emitted
+  bool EmitScalarConstructor(ast::ScalarConstructorExpression* expr);
   /// Handles a continue statement
   /// @param stmt the statement to emit
   /// @returns true if the statement was emitted successfully
@@ -140,10 +140,10 @@
   /// @param import the import to generate
   /// @returns true if the import was emitted
   bool EmitImport(const ast::Import* import);
-  /// Handles generating initializer expressions
-  /// @param expr the initializer expression
+  /// Handles generating constructor expressions
+  /// @param expr the constructor expression
   /// @returns true if the expression was emitted
-  bool EmitInitializer(ast::InitializerExpression* expr);
+  bool EmitConstructor(ast::ConstructorExpression* expr);
   /// Handles generating a kill statement
   /// @param stmt the kill statement
   /// @returns true if the statement was successfully emitted
@@ -198,10 +198,10 @@
   /// @param type the type to generate
   /// @returns true if the type is emitted
   bool EmitType(ast::type::Type* type);
-  /// Handles emitting a type initializer
-  /// @param expr the type initializer expression
-  /// @returns true if the initializer is emitted
-  bool EmitTypeInitializer(ast::TypeInitializerExpression* expr);
+  /// Handles emitting a type constructor
+  /// @param expr the type constructor expression
+  /// @returns true if the constructor is emitted
+  bool EmitTypeConstructor(ast::TypeConstructorExpression* expr);
   /// Handles a unary derivative expression
   /// @param expr the expression to emit
   /// @returns true if the expression was emitted
diff --git a/src/writer/wgsl/generator_impl_array_accessor_test.cc b/src/writer/wgsl/generator_impl_array_accessor_test.cc
index 4fd4c9d..437fcba 100644
--- a/src/writer/wgsl/generator_impl_array_accessor_test.cc
+++ b/src/writer/wgsl/generator_impl_array_accessor_test.cc
@@ -16,9 +16,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/array_accessor_expression.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/int_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/i32_type.h"
 #include "src/writer/wgsl/generator_impl.h"
 
@@ -32,7 +32,7 @@
 TEST_F(GeneratorImplTest, EmitExpression_ArrayAccessor) {
   ast::type::I32Type i32;
   auto lit = std::make_unique<ast::IntLiteral>(&i32, 5);
-  auto idx = std::make_unique<ast::ConstInitializerExpression>(std::move(lit));
+  auto idx = std::make_unique<ast::ScalarConstructorExpression>(std::move(lit));
   auto ary = std::make_unique<ast::IdentifierExpression>("ary");
 
   ast::ArrayAccessorExpression expr(std::move(ary), std::move(idx));
diff --git a/src/writer/wgsl/generator_impl_initializer_test.cc b/src/writer/wgsl/generator_impl_constructor_test.cc
similarity index 62%
rename from src/writer/wgsl/generator_impl_initializer_test.cc
rename to src/writer/wgsl/generator_impl_constructor_test.cc
index 44ae88a..4b3cd9a 100644
--- a/src/writer/wgsl/generator_impl_initializer_test.cc
+++ b/src/writer/wgsl/generator_impl_constructor_test.cc
@@ -17,9 +17,9 @@
 
 #include "gtest/gtest.h"
 #include "src/ast/bool_literal.h"
-#include "src/ast/const_initializer_expression.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/int_literal.h"
+#include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type/array_type.h"
 #include "src/ast/type/bool_type.h"
 #include "src/ast/type/f32_type.h"
@@ -37,107 +37,107 @@
 
 using GeneratorImplTest = testing::Test;
 
-TEST_F(GeneratorImplTest, EmitInitializer_Bool) {
+TEST_F(GeneratorImplTest, EmitConstructor_Bool) {
   ast::type::BoolType bool_type;
   auto lit = std::make_unique<ast::BoolLiteral>(&bool_type, false);
-  ast::ConstInitializerExpression expr(std::move(lit));
+  ast::ScalarConstructorExpression expr(std::move(lit));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "false");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Int) {
+TEST_F(GeneratorImplTest, EmitConstructor_Int) {
   ast::type::I32Type i32;
   auto lit = std::make_unique<ast::IntLiteral>(&i32, -12345);
-  ast::ConstInitializerExpression expr(std::move(lit));
+  ast::ScalarConstructorExpression expr(std::move(lit));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "-12345");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_UInt) {
+TEST_F(GeneratorImplTest, EmitConstructor_UInt) {
   ast::type::U32Type u32;
   auto lit = std::make_unique<ast::UintLiteral>(&u32, 56779);
-  ast::ConstInitializerExpression expr(std::move(lit));
+  ast::ScalarConstructorExpression expr(std::move(lit));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "56779u");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Float) {
+TEST_F(GeneratorImplTest, EmitConstructor_Float) {
   ast::type::F32Type f32;
   auto lit = std::make_unique<ast::FloatLiteral>(&f32, 1.5e27);
-  ast::ConstInitializerExpression expr(std::move(lit));
+  ast::ScalarConstructorExpression expr(std::move(lit));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "1.49999995e+27");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Float) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Float) {
   ast::type::F32Type f32;
 
   auto lit = std::make_unique<ast::FloatLiteral>(&f32, -1.2e-5);
   std::vector<std::unique_ptr<ast::Expression>> values;
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit)));
 
-  ast::TypeInitializerExpression expr(&f32, std::move(values));
+  ast::TypeConstructorExpression expr(&f32, std::move(values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "f32(-1.20000004e-05)");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Bool) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Bool) {
   ast::type::BoolType b;
 
   auto lit = std::make_unique<ast::BoolLiteral>(&b, true);
   std::vector<std::unique_ptr<ast::Expression>> values;
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit)));
 
-  ast::TypeInitializerExpression expr(&b, std::move(values));
+  ast::TypeConstructorExpression expr(&b, std::move(values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "bool(true)");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Int) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Int) {
   ast::type::I32Type i32;
 
   auto lit = std::make_unique<ast::IntLiteral>(&i32, -12345);
   std::vector<std::unique_ptr<ast::Expression>> values;
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit)));
 
-  ast::TypeInitializerExpression expr(&i32, std::move(values));
+  ast::TypeConstructorExpression expr(&i32, std::move(values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "i32(-12345)");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Uint) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Uint) {
   ast::type::U32Type u32;
 
   auto lit = std::make_unique<ast::UintLiteral>(&u32, 12345);
   std::vector<std::unique_ptr<ast::Expression>> values;
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit)));
 
-  ast::TypeInitializerExpression expr(&u32, std::move(values));
+  ast::TypeConstructorExpression expr(&u32, std::move(values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "u32(12345u)");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Vec) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Vec) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 3);
 
@@ -146,20 +146,20 @@
   auto lit3 = std::make_unique<ast::FloatLiteral>(&f32, 3.f);
   std::vector<std::unique_ptr<ast::Expression>> values;
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit1)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit1)));
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit2)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit2)));
   values.push_back(
-      std::make_unique<ast::ConstInitializerExpression>(std::move(lit3)));
+      std::make_unique<ast::ScalarConstructorExpression>(std::move(lit3)));
 
-  ast::TypeInitializerExpression expr(&vec, std::move(values));
+  ast::TypeConstructorExpression expr(&vec, std::move(values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), "vec3<f32>(1.00000000, 2.00000000, 3.00000000)");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Mat) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Mat) {
   ast::type::F32Type f32;
   ast::type::MatrixType mat(&f32, 3, 2);
 
@@ -173,25 +173,25 @@
 
     std::vector<std::unique_ptr<ast::Expression>> values;
     values.push_back(
-        std::make_unique<ast::ConstInitializerExpression>(std::move(lit1)));
+        std::make_unique<ast::ScalarConstructorExpression>(std::move(lit1)));
     values.push_back(
-        std::make_unique<ast::ConstInitializerExpression>(std::move(lit2)));
+        std::make_unique<ast::ScalarConstructorExpression>(std::move(lit2)));
 
-    mat_values.push_back(std::make_unique<ast::TypeInitializerExpression>(
+    mat_values.push_back(std::make_unique<ast::TypeConstructorExpression>(
         &vec, std::move(values)));
   }
 
-  ast::TypeInitializerExpression expr(&mat, std::move(mat_values));
+  ast::TypeConstructorExpression expr(&mat, std::move(mat_values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(),
             std::string("mat2x3<f32>(vec2<f32>(1.00000000, 2.00000000), ") +
                 "vec2<f32>(3.00000000, 4.00000000), " +
                 "vec2<f32>(5.00000000, 6.00000000))");
 }
 
-TEST_F(GeneratorImplTest, EmitInitializer_Type_Array) {
+TEST_F(GeneratorImplTest, EmitConstructor_Type_Array) {
   ast::type::F32Type f32;
   ast::type::VectorType vec(&f32, 3);
   ast::type::ArrayType ary(&vec, 3);
@@ -205,20 +205,20 @@
 
     std::vector<std::unique_ptr<ast::Expression>> values;
     values.push_back(
-        std::make_unique<ast::ConstInitializerExpression>(std::move(lit1)));
+        std::make_unique<ast::ScalarConstructorExpression>(std::move(lit1)));
     values.push_back(
-        std::make_unique<ast::ConstInitializerExpression>(std::move(lit2)));
+        std::make_unique<ast::ScalarConstructorExpression>(std::move(lit2)));
     values.push_back(
-        std::make_unique<ast::ConstInitializerExpression>(std::move(lit3)));
+        std::make_unique<ast::ScalarConstructorExpression>(std::move(lit3)));
 
-    ary_values.push_back(std::make_unique<ast::TypeInitializerExpression>(
+    ary_values.push_back(std::make_unique<ast::TypeConstructorExpression>(
         &vec, std::move(values)));
   }
 
-  ast::TypeInitializerExpression expr(&ary, std::move(ary_values));
+  ast::TypeConstructorExpression expr(&ary, std::move(ary_values));
 
   GeneratorImpl g;
-  ASSERT_TRUE(g.EmitInitializer(&expr)) << g.error();
+  ASSERT_TRUE(g.EmitConstructor(&expr)) << g.error();
   EXPECT_EQ(g.result(), std::string("array<vec3<f32>, 3>(") +
                             "vec3<f32>(1.00000000, 2.00000000, 3.00000000), " +
                             "vec3<f32>(4.00000000, 5.00000000, 6.00000000), " +
diff --git a/src/writer/wgsl/generator_impl_variable_test.cc b/src/writer/wgsl/generator_impl_variable_test.cc
index 06463e8..dce656a 100644
--- a/src/writer/wgsl/generator_impl_variable_test.cc
+++ b/src/writer/wgsl/generator_impl_variable_test.cc
@@ -91,12 +91,12 @@
 )");
 }
 
-TEST_F(GeneratorImplTest, EmitVariable_Initializer) {
+TEST_F(GeneratorImplTest, EmitVariable_Constructor) {
   auto ident = std::make_unique<ast::IdentifierExpression>("initializer");
 
   ast::type::F32Type f32;
   ast::Variable v("a", ast::StorageClass::kNone, &f32);
-  v.set_initializer(std::move(ident));
+  v.set_constructor(std::move(ident));
 
   GeneratorImpl g;
   ASSERT_TRUE(g.EmitVariable(&v)) << g.error();
@@ -109,7 +109,7 @@
 
   ast::type::F32Type f32;
   ast::Variable v("a", ast::StorageClass::kNone, &f32);
-  v.set_initializer(std::move(ident));
+  v.set_constructor(std::move(ident));
   v.set_is_const(true);
 
   GeneratorImpl g;