validator tests: Replace std::make_unique<T> -> create<T>

create() is currently just a simple forwarder to std::make_unique<>, but
will be later replaced with a function that returns a raw pointer,
and owned by the context.

Bug: tint:322
Change-Id: I69487200d9595f3176615ee1edf81da9fe1f5abc
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/32670
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
diff --git a/src/validator/validator_control_block_test.cc b/src/validator/validator_control_block_test.cc
index 7406aae..a80e656 100644
--- a/src/validator/validator_control_block_test.cc
+++ b/src/validator/validator_control_block_test.cc
@@ -43,23 +43,21 @@
   //   default: {}
   // }
   ast::type::F32Type f32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&f32, 3.14f)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&f32, 3.14f)));
 
-  auto cond = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "a");
+  auto cond =
+      create<ast::IdentifierExpression>(Source{Source::Location{12, 34}}, "a");
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
+  auto block_default = create<ast::BlockStatement>();
   ast::CaseStatementList body;
-  body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                            std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(
-      std::make_unique<ast::SwitchStatement>(std::move(cond), std::move(body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(std::move(cond), std::move(body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -74,22 +72,21 @@
   //   case 1: {}
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
   ast::CaseSelectorList csl;
-  csl.push_back(std::make_unique<ast::SintLiteral>(&i32, 1));
+  csl.push_back(create<ast::SintLiteral>(&i32, 1));
   ast::CaseStatementList body;
-  body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(csl), std::make_unique<ast::BlockStatement>()));
+  body.push_back(create<ast::CaseStatement>(std::move(csl),
+                                            create<ast::BlockStatement>()));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(
-      Source{Source::Location{12, 34}}, std::move(cond), std::move(body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(Source{Source::Location{12, 34}},
+                                             std::move(cond), std::move(body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -106,35 +103,34 @@
   //   default: {}
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
   ast::CaseStatementList switch_body;
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
 
   ast::CaseSelectorList default_csl_1;
-  auto block_default_1 = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl_1), std::move(block_default_1)));
+  auto block_default_1 = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl_1),
+                                                   std::move(block_default_1)));
 
   ast::CaseSelectorList csl_case_1;
-  csl_case_1.push_back(std::make_unique<ast::SintLiteral>(&i32, 1));
-  auto block_case_1 = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(csl_case_1), std::move(block_case_1)));
+  csl_case_1.push_back(create<ast::SintLiteral>(&i32, 1));
+  auto block_case_1 = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(csl_case_1),
+                                                   std::move(block_case_1)));
 
   ast::CaseSelectorList default_csl_2;
-  auto block_default_2 = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl_2), std::move(block_default_2)));
+  auto block_default_2 = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl_2),
+                                                   std::move(block_default_2)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(
-      Source{Source::Location{12, 34}}, std::move(cond),
-      std::move(switch_body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(Source{Source::Location{12, 34}},
+                                             std::move(cond),
+                                             std::move(switch_body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -152,29 +148,28 @@
   // }
   ast::type::U32Type u32;
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
   ast::CaseStatementList switch_body;
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
 
   ast::CaseSelectorList csl;
-  csl.push_back(std::make_unique<ast::UintLiteral>(&u32, 1));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
+  csl.push_back(create<ast::UintLiteral>(&u32, 1));
+  switch_body.push_back(create<ast::CaseStatement>(
       Source{Source::Location{12, 34}}, std::move(csl),
-      std::make_unique<ast::BlockStatement>()));
+      create<ast::BlockStatement>()));
 
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  auto block_default = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                                   std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(std::move(cond),
-                                                       std::move(switch_body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(
+      create<ast::SwitchStatement>(std::move(cond), std::move(switch_body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -192,29 +187,28 @@
   // }
   ast::type::U32Type u32;
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &u32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::UintLiteral>(&u32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &u32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::UintLiteral>(&u32, 2)));
 
   ast::CaseStatementList switch_body;
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
 
   ast::CaseSelectorList csl;
-  csl.push_back(std::make_unique<ast::SintLiteral>(&i32, -1));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
+  csl.push_back(create<ast::SintLiteral>(&i32, -1));
+  switch_body.push_back(create<ast::CaseStatement>(
       Source{Source::Location{12, 34}}, std::move(csl),
-      std::make_unique<ast::BlockStatement>()));
+      create<ast::BlockStatement>()));
 
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  auto block_default = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                                   std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(std::move(cond),
-                                                       std::move(switch_body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(
+      create<ast::SwitchStatement>(std::move(cond), std::move(switch_body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -231,35 +225,34 @@
   //   default: {}
   // }
   ast::type::U32Type u32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &u32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::UintLiteral>(&u32, 3)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &u32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::UintLiteral>(&u32, 3)));
 
   ast::CaseStatementList switch_body;
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
 
   ast::CaseSelectorList csl_1;
-  csl_1.push_back(std::make_unique<ast::UintLiteral>(&u32, 0));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(csl_1), std::make_unique<ast::BlockStatement>()));
+  csl_1.push_back(create<ast::UintLiteral>(&u32, 0));
+  switch_body.push_back(create<ast::CaseStatement>(
+      std::move(csl_1), create<ast::BlockStatement>()));
 
   ast::CaseSelectorList csl_2;
-  csl_2.push_back(std::make_unique<ast::UintLiteral>(&u32, 2));
-  csl_2.push_back(std::make_unique<ast::UintLiteral>(&u32, 2));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
+  csl_2.push_back(create<ast::UintLiteral>(&u32, 2));
+  csl_2.push_back(create<ast::UintLiteral>(&u32, 2));
+  switch_body.push_back(create<ast::CaseStatement>(
       Source{Source::Location{12, 34}}, std::move(csl_2),
-      std::make_unique<ast::BlockStatement>()));
+      create<ast::BlockStatement>()));
 
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  auto block_default = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                                   std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(std::move(cond),
-                                                       std::move(switch_body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(
+      create<ast::SwitchStatement>(std::move(cond), std::move(switch_body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -276,37 +269,36 @@
   //   default: {}
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
   ast::CaseStatementList switch_body;
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
 
   ast::CaseSelectorList csl_1;
-  csl_1.push_back(std::make_unique<ast::SintLiteral>(&i32, 10));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(csl_1), std::make_unique<ast::BlockStatement>()));
+  csl_1.push_back(create<ast::SintLiteral>(&i32, 10));
+  switch_body.push_back(create<ast::CaseStatement>(
+      std::move(csl_1), create<ast::BlockStatement>()));
 
   ast::CaseSelectorList csl_2;
-  csl_2.push_back(std::make_unique<ast::SintLiteral>(&i32, 0));
-  csl_2.push_back(std::make_unique<ast::SintLiteral>(&i32, 1));
-  csl_2.push_back(std::make_unique<ast::SintLiteral>(&i32, 2));
-  csl_2.push_back(std::make_unique<ast::SintLiteral>(&i32, 10));
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
+  csl_2.push_back(create<ast::SintLiteral>(&i32, 0));
+  csl_2.push_back(create<ast::SintLiteral>(&i32, 1));
+  csl_2.push_back(create<ast::SintLiteral>(&i32, 2));
+  csl_2.push_back(create<ast::SintLiteral>(&i32, 10));
+  switch_body.push_back(create<ast::CaseStatement>(
       Source{Source::Location{12, 34}}, std::move(csl_2),
-      std::make_unique<ast::BlockStatement>()));
+      create<ast::BlockStatement>()));
 
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
-  switch_body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  auto block_default = create<ast::BlockStatement>();
+  switch_body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                                   std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(std::make_unique<ast::SwitchStatement>(std::move(cond),
-                                                       std::move(switch_body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(
+      create<ast::SwitchStatement>(std::move(cond), std::move(switch_body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -321,24 +313,22 @@
   //   default: { fallthrough; }
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
-  block_default->append(std::make_unique<ast::FallthroughStatement>(
-      Source{Source::Location{12, 34}}));
+  auto block_default = create<ast::BlockStatement>();
+  block_default->append(
+      create<ast::FallthroughStatement>(Source{Source::Location{12, 34}}));
   ast::CaseStatementList body;
-  body.push_back(std::make_unique<ast::CaseStatement>(
-      std::move(default_csl), std::move(block_default)));
+  body.push_back(create<ast::CaseStatement>(std::move(default_csl),
+                                            std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(
-      std::make_unique<ast::SwitchStatement>(std::move(cond), std::move(body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(std::move(cond), std::move(body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(block.get()));
@@ -354,28 +344,26 @@
   //   case 5: {}
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
+  auto block_default = create<ast::BlockStatement>();
   ast::CaseStatementList body;
-  body.push_back(std::make_unique<ast::CaseStatement>(
-      Source{Source::Location{12, 34}}, std::move(default_csl),
-      std::move(block_default)));
+  body.push_back(create<ast::CaseStatement>(Source{Source::Location{12, 34}},
+                                            std::move(default_csl),
+                                            std::move(block_default)));
   ast::CaseSelectorList case_csl;
-  case_csl.push_back(std::make_unique<ast::SintLiteral>(&i32, 5));
-  auto block_case = std::make_unique<ast::BlockStatement>();
-  body.push_back(std::make_unique<ast::CaseStatement>(std::move(case_csl),
-                                                      std::move(block_case)));
+  case_csl.push_back(create<ast::SintLiteral>(&i32, 5));
+  auto block_case = create<ast::BlockStatement>();
+  body.push_back(
+      create<ast::CaseStatement>(std::move(case_csl), std::move(block_case)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(
-      std::make_unique<ast::SwitchStatement>(std::move(cond), std::move(body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(std::move(cond), std::move(body)));
 
   EXPECT_TRUE(td()->DetermineStatements(block.get())) << td()->error();
   EXPECT_TRUE(v()->ValidateStatements(block.get())) << v()->error();
@@ -391,23 +379,21 @@
   ast::type::U32Type u32;
   ast::type::AliasType my_int{"MyInt", &u32};
 
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &my_int);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&u32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &my_int);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&u32, 2)));
 
-  auto cond = std::make_unique<ast::IdentifierExpression>("a");
+  auto cond = create<ast::IdentifierExpression>("a");
   ast::CaseSelectorList default_csl;
-  auto block_default = std::make_unique<ast::BlockStatement>();
+  auto block_default = create<ast::BlockStatement>();
   ast::CaseStatementList body;
-  body.push_back(std::make_unique<ast::CaseStatement>(
-      Source{Source::Location{12, 34}}, std::move(default_csl),
-      std::move(block_default)));
+  body.push_back(create<ast::CaseStatement>(Source{Source::Location{12, 34}},
+                                            std::move(default_csl),
+                                            std::move(block_default)));
 
-  auto block = std::make_unique<ast::BlockStatement>();
-  block->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block->append(
-      std::make_unique<ast::SwitchStatement>(std::move(cond), std::move(body)));
+  auto block = create<ast::BlockStatement>();
+  block->append(create<ast::VariableDeclStatement>(std::move(var)));
+  block->append(create<ast::SwitchStatement>(std::move(cond), std::move(body)));
 
   mod()->AddConstructedType(&my_int);
 
diff --git a/src/validator/validator_function_test.cc b/src/validator/validator_function_test.cc
index 5f60f85..6ad4acd 100644
--- a/src/validator/validator_function_test.cc
+++ b/src/validator/validator_function_test.cc
@@ -39,20 +39,19 @@
   // [[stage(vertex)]]
   // fn func -> void { var a:i32 = 2; }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
   ast::VariableList params;
   ast::type::VoidType void_type;
-  auto func = std::make_unique<ast::Function>(
-      Source{Source::Location{12, 34}}, "func", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}}, "func",
+                                    std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -65,10 +64,10 @@
   // fn func -> void {}
   ast::type::VoidType void_type;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>(
-      Source{Source::Location{12, 34}}, "func", std::move(params), &void_type);
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}}, "func",
+                                    std::move(params), &void_type);
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -79,17 +78,16 @@
   // fn func -> int { var a:i32 = 2; }
 
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
   ast::VariableList params;
   ast::type::VoidType void_type;
-  auto func = std::make_unique<ast::Function>(Source{Source::Location{12, 34}},
-                                              "func", std::move(params), &i32);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}}, "func",
+                                    std::move(params), &i32);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
   func->set_body(std::move(body));
   mod()->AddFunction(std::move(func));
 
@@ -105,8 +103,8 @@
   ast::type::VoidType void_type;
   ast::type::I32Type i32;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>(Source{Source::Location{12, 34}},
-                                              "func", std::move(params), &i32);
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}}, "func",
+                                    std::move(params), &i32);
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -122,13 +120,12 @@
   ast::type::VoidType void_type;
   ast::VariableList params;
 
-  auto func =
-      std::make_unique<ast::Function>("func", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>());
+  auto func = create<ast::Function>("func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->DetermineFunctions(mod()->functions())) << td()->error();
@@ -140,14 +137,13 @@
   ast::type::VoidType void_type;
   ast::type::I32Type i32;
   ast::VariableList params;
-  auto func =
-      std::make_unique<ast::Function>("func", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  auto return_expr = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto func = create<ast::Function>("func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  auto return_expr = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  body->append(std::make_unique<ast::ReturnStatement>(
-      Source{Source::Location{12, 34}}, std::move(return_expr)));
+  body->append(create<ast::ReturnStatement>(Source{Source::Location{12, 34}},
+                                            std::move(return_expr)));
   func->set_body(std::move(body));
   mod()->AddFunction(std::move(func));
 
@@ -164,13 +160,13 @@
   ast::type::I32Type i32;
   ast::type::F32Type f32;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>("func", std::move(params), &f32);
-  auto body = std::make_unique<ast::BlockStatement>();
-  auto return_expr = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto func = create<ast::Function>("func", std::move(params), &f32);
+  auto body = create<ast::BlockStatement>();
+  auto return_expr = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  body->append(std::make_unique<ast::ReturnStatement>(
-      Source{Source::Location{12, 34}}, std::move(return_expr)));
+  body->append(create<ast::ReturnStatement>(Source{Source::Location{12, 34}},
+                                            std::move(return_expr)));
   func->set_body(std::move(body));
   mod()->AddFunction(std::move(func));
 
@@ -189,23 +185,22 @@
   ast::type::I32Type i32;
 
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>("func", std::move(params), &i32);
-  auto body = std::make_unique<ast::BlockStatement>();
-  auto return_expr = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto func = create<ast::Function>("func", std::move(params), &i32);
+  auto body = create<ast::BlockStatement>();
+  auto return_expr = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  body->append(std::make_unique<ast::ReturnStatement>(std::move(return_expr)));
+  body->append(create<ast::ReturnStatement>(std::move(return_expr)));
   func->set_body(std::move(body));
 
   ast::VariableList params_copy;
-  auto func_copy = std::make_unique<ast::Function>(
-      Source{Source::Location{12, 34}}, "func", std::move(params_copy), &i32);
-  auto body_copy = std::make_unique<ast::BlockStatement>();
-  auto return_expr_copy = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto func_copy = create<ast::Function>(Source{Source::Location{12, 34}},
+                                         "func", std::move(params_copy), &i32);
+  auto body_copy = create<ast::BlockStatement>();
+  auto return_expr_copy = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  body_copy->append(
-      std::make_unique<ast::ReturnStatement>(std::move(return_expr_copy)));
+  body_copy->append(create<ast::ReturnStatement>(std::move(return_expr_copy)));
   func_copy->set_body(std::move(body_copy));
 
   mod()->AddFunction(std::move(func));
@@ -222,16 +217,14 @@
   ast::type::F32Type f32;
   ast::type::VoidType void_type;
   ast::ExpressionList call_params;
-  auto call_expr = std::make_unique<ast::CallExpression>(
+  auto call_expr = create<ast::CallExpression>(
       Source{Source::Location{12, 34}},
-      std::make_unique<ast::IdentifierExpression>("func"),
-      std::move(call_params));
+      create<ast::IdentifierExpression>("func"), std::move(call_params));
   ast::VariableList params0;
-  auto func0 =
-      std::make_unique<ast::Function>("func", std::move(params0), &f32);
-  auto body0 = std::make_unique<ast::BlockStatement>();
-  body0->append(std::make_unique<ast::CallStatement>(std::move(call_expr)));
-  body0->append(std::make_unique<ast::ReturnStatement>());
+  auto func0 = create<ast::Function>("func", std::move(params0), &f32);
+  auto body0 = create<ast::BlockStatement>();
+  body0->append(create<ast::CallStatement>(std::move(call_expr)));
+  body0->append(create<ast::ReturnStatement>());
   func0->set_body(std::move(body0));
   mod()->AddFunction(std::move(func0));
 
@@ -243,23 +236,20 @@
 TEST_F(ValidateFunctionTest, RecursionIsNotAllowedExpr_Fail) {
   // fn func() -> i32 {var a: i32 = func(); return 2; }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
   ast::ExpressionList call_params;
-  auto call_expr = std::make_unique<ast::CallExpression>(
+  auto call_expr = create<ast::CallExpression>(
       Source{Source::Location{12, 34}},
-      std::make_unique<ast::IdentifierExpression>("func"),
-      std::move(call_params));
+      create<ast::IdentifierExpression>("func"), std::move(call_params));
   var->set_constructor(std::move(call_expr));
   ast::VariableList params0;
-  auto func0 =
-      std::make_unique<ast::Function>("func", std::move(params0), &i32);
-  auto body0 = std::make_unique<ast::BlockStatement>();
-  body0->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  auto return_expr = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto func0 = create<ast::Function>("func", std::move(params0), &i32);
+  auto body0 = create<ast::BlockStatement>();
+  body0->append(create<ast::VariableDeclStatement>(std::move(var)));
+  auto return_expr = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  body0->append(std::make_unique<ast::ReturnStatement>(std::move(return_expr)));
+  body0->append(create<ast::ReturnStatement>(std::move(return_expr)));
   func0->set_body(std::move(body0));
   mod()->AddFunction(std::move(func0));
 
@@ -273,16 +263,16 @@
   // fn vtx_main() -> i32 { return 0; }
   ast::type::I32Type i32;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>(
-      Source{Source::Location{12, 34}}, "vtx_main", std::move(params), &i32);
-  auto return_expr = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 0));
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}},
+                                    "vtx_main", std::move(params), &i32);
+  auto return_expr = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 0));
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>(std::move(return_expr)));
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>(std::move(return_expr)));
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
 
   mod()->AddFunction(std::move(func));
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -297,16 +287,14 @@
   ast::type::I32Type i32;
   ast::type::VoidType void_type;
   ast::VariableList params;
-  params.push_back(
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32));
-  auto func = std::make_unique<ast::Function>(Source{Source::Location{12, 34}},
-                                              "vtx_func", std::move(params),
-                                              &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>());
+  params.push_back(create<ast::Variable>("a", ast::StorageClass::kNone, &i32));
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}},
+                                    "vtx_func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
 
   mod()->AddFunction(std::move(func));
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -322,15 +310,15 @@
   // fn main() -> void { return; }
   ast::type::VoidType void_type;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>(
-      Source{Source::Location{12, 34}}, "main", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>());
+  auto func = create<ast::Function>(Source{Source::Location{12, 34}}, "main",
+                                    std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kFragment, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kFragment, Source{}));
   mod()->AddFunction(std::move(func));
   EXPECT_TRUE(td()->Determine()) << td()->error();
   EXPECT_FALSE(v()->Validate(mod()));
@@ -344,13 +332,12 @@
   // fn vtx_func() -> void { return; }
   ast::type::VoidType void_type;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>("vtx_func", std::move(params),
-                                              &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>());
+  auto func = create<ast::Function>("vtx_func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -361,10 +348,9 @@
   // fn vtx_func() -> void { return; }
   ast::type::VoidType void_type;
   ast::VariableList params;
-  auto func = std::make_unique<ast::Function>("vtx_func", std::move(params),
-                                              &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::ReturnStatement>());
+  auto func = create<ast::Function>("vtx_func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
   mod()->AddFunction(std::move(func));
 
diff --git a/src/validator/validator_test.cc b/src/validator/validator_test.cc
index 000493f..a6bed90 100644
--- a/src/validator/validator_test.cc
+++ b/src/validator/validator_test.cc
@@ -64,9 +64,9 @@
   // 1 = my_var;
   ast::type::I32Type i32;
 
-  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 1));
-  auto rhs = std::make_unique<ast::IdentifierExpression>("my_var");
+  auto lhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 1));
+  auto rhs = create<ast::IdentifierExpression>("my_var");
   ast::AssignmentStatement assign(Source{Source::Location{12, 34}},
                                   std::move(lhs), std::move(rhs));
 
@@ -80,11 +80,11 @@
   // b = 2;
   ast::type::I32Type i32;
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "b");
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
-  auto assign = std::make_unique<ast::AssignmentStatement>(
+  auto lhs =
+      create<ast::IdentifierExpression>(Source{Source::Location{12, 34}}, "b");
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
+  auto assign = create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs));
 
   EXPECT_FALSE(td()->DetermineResultType(assign.get()));
@@ -98,13 +98,13 @@
   // }
   ast::type::I32Type i32;
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "b");
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto lhs =
+      create<ast::IdentifierExpression>(Source{Source::Location{12, 34}}, "b");
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_FALSE(td()->DetermineStatements(body.get()));
@@ -116,15 +116,14 @@
   // var a :i32 = 2;
   // a = 2
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
   auto* rhs_ptr = rhs.get();
 
   ast::AssignmentStatement assign(Source{Source::Location{12, 34}},
@@ -144,14 +143,13 @@
   ast::type::F32Type f32;
   ast::type::I32Type i32;
 
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.3f));
   auto* rhs_ptr = rhs.get();
 
   ast::AssignmentStatement assign(Source{Source::Location{12, 34}},
@@ -174,20 +172,19 @@
   //  a = 2
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
   auto* rhs_ptr = rhs.get();
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_TRUE(td()->DetermineStatements(body.get())) << td()->error();
@@ -205,19 +202,18 @@
   ast::type::F32Type f32;
   ast::type::I32Type i32;
 
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.3f));
   auto* rhs_ptr = rhs.get();
 
   ast::BlockStatement block;
-  block.append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  block.append(std::make_unique<ast::AssignmentStatement>(
+  block.append(create<ast::VariableDeclStatement>(std::move(var)));
+  block.append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_TRUE(td()->DetermineStatements(&block)) << td()->error();
@@ -234,9 +230,9 @@
 TEST_F(ValidatorTest, GlobalVariableWithStorageClass_Pass) {
   // var<in> gloabl_var: f32;
   ast::type::F32Type f32;
-  auto global_var = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var", ast::StorageClass::kInput,
-      &f32);
+  auto global_var =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var",
+                            ast::StorageClass::kInput, &f32);
   mod()->AddGlobalVariable(std::move(global_var));
   EXPECT_TRUE(v()->ValidateGlobalVariables(mod()->global_variables()))
       << v()->error();
@@ -245,9 +241,9 @@
 TEST_F(ValidatorTest, GlobalVariableNoStorageClass_Fail) {
   // var gloabl_var: f32;
   ast::type::F32Type f32;
-  auto global_var = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var", ast::StorageClass::kNone,
-      &f32);
+  auto global_var =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var",
+                            ast::StorageClass::kNone, &f32);
   mod()->AddGlobalVariable(std::move(global_var));
   EXPECT_TRUE(td()->Determine()) << td()->error();
   EXPECT_FALSE(v()->Validate(mod()));
@@ -257,9 +253,9 @@
 TEST_F(ValidatorTest, GlobalConstantWithStorageClass_Fail) {
   // const<in> gloabl_var: f32;
   ast::type::F32Type f32;
-  auto global_var = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var", ast::StorageClass::kInput,
-      &f32);
+  auto global_var =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var",
+                            ast::StorageClass::kInput, &f32);
   global_var->set_is_const(true);
 
   mod()->AddGlobalVariable(std::move(global_var));
@@ -273,9 +269,9 @@
 TEST_F(ValidatorTest, GlobalConstNoStorageClass_Pass) {
   // const gloabl_var: f32;
   ast::type::F32Type f32;
-  auto global_var = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var", ast::StorageClass::kNone,
-      &f32);
+  auto global_var =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var",
+                            ast::StorageClass::kNone, &f32);
   global_var->set_is_const(true);
 
   mod()->AddGlobalVariable(std::move(global_var));
@@ -289,24 +285,22 @@
   //   not_global_var = 3.14f;
   // }
   ast::type::F32Type f32;
-  auto global_var = std::make_unique<ast::Variable>(
-      "global_var", ast::StorageClass::kPrivate, &f32);
-  global_var->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 2.1)));
+  auto global_var =
+      create<ast::Variable>("global_var", ast::StorageClass::kPrivate, &f32);
+  global_var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.1)));
   mod()->AddGlobalVariable(std::move(global_var));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "not_global_var");
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 3.14f));
+  auto lhs = create<ast::IdentifierExpression>(Source{Source::Location{12, 34}},
+                                               "not_global_var");
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14f));
 
   ast::VariableList params;
-  auto func =
-      std::make_unique<ast::Function>("my_func", std::move(params), &f32);
+  auto func = create<ast::Function>("my_func", std::move(params), &f32);
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
   func->set_body(std::move(body));
   mod()->AddFunction(std::move(func));
@@ -324,28 +318,26 @@
   ast::type::F32Type f32;
   ast::type::VoidType void_type;
 
-  auto global_var = std::make_unique<ast::Variable>(
-      "global_var", ast::StorageClass::kPrivate, &f32);
-  global_var->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 2.1)));
+  auto global_var =
+      create<ast::Variable>("global_var", ast::StorageClass::kPrivate, &f32);
+  global_var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.1)));
   mod()->AddGlobalVariable(std::move(global_var));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>("global_var");
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 3.14f));
+  auto lhs = create<ast::IdentifierExpression>("global_var");
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14f));
 
   ast::VariableList params;
-  auto func =
-      std::make_unique<ast::Function>("my_func", std::move(params), &void_type);
+  auto func = create<ast::Function>("my_func", std::move(params), &void_type);
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
-  body->append(std::make_unique<ast::ReturnStatement>());
+  body->append(create<ast::ReturnStatement>());
   func->set_body(std::move(body));
-  func->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
   mod()->AddFunction(std::move(func));
 
   EXPECT_TRUE(td()->Determine()) << td()->error();
@@ -358,28 +350,27 @@
   //   a = 3.14;
   // }
   ast::type::F32Type f32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
 
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::BoolLiteral>(&bool_type, true));
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
+  auto cond = create<ast::ScalarConstructorExpression>(
+      create<ast::BoolLiteral>(&bool_type, true));
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "a");
+  auto lhs =
+      create<ast::IdentifierExpression>(Source{Source::Location{12, 34}}, "a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 3.14f));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14f));
   auto* rhs_ptr = rhs.get();
 
-  auto outer_body = std::make_unique<ast::BlockStatement>();
+  auto outer_body = create<ast::BlockStatement>();
   outer_body->append(
-      std::make_unique<ast::IfStatement>(std::move(cond), std::move(body)));
-  outer_body->append(std::make_unique<ast::AssignmentStatement>(
+      create<ast::IfStatement>(std::move(cond), std::move(body)));
+  outer_body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_TRUE(td()->DetermineStatements(outer_body.get())) << td()->error();
@@ -395,29 +386,27 @@
   //   if (true) { a = 3.14; }
   // }
   ast::type::F32Type f32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>(
-      Source{Source::Location{12, 34}}, "a");
+  auto lhs =
+      create<ast::IdentifierExpression>(Source{Source::Location{12, 34}}, "a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 3.14f));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14f));
   auto* rhs_ptr = rhs.get();
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::BoolLiteral>(&bool_type, true));
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto cond = create<ast::ScalarConstructorExpression>(
+      create<ast::BoolLiteral>(&bool_type, true));
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
-  auto outer_body = std::make_unique<ast::BlockStatement>();
+  auto outer_body = create<ast::BlockStatement>();
+  outer_body->append(create<ast::VariableDeclStatement>(std::move(var)));
   outer_body->append(
-      std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  outer_body->append(
-      std::make_unique<ast::IfStatement>(std::move(cond), std::move(body)));
+      create<ast::IfStatement>(std::move(cond), std::move(body)));
   EXPECT_TRUE(td()->DetermineStatements(outer_body.get())) << td()->error();
   ASSERT_NE(lhs_ptr->result_type(), nullptr);
   ASSERT_NE(rhs_ptr->result_type(), nullptr);
@@ -429,17 +418,17 @@
   // var global_var1 : i32 = 0;
   ast::type::F32Type f32;
   ast::type::I32Type i32;
-  auto var0 = std::make_unique<ast::Variable>(
-      "global_var0", ast::StorageClass::kPrivate, &f32);
-  var0->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 0.1)));
+  auto var0 =
+      create<ast::Variable>("global_var0", ast::StorageClass::kPrivate, &f32);
+  var0->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 0.1)));
   mod()->AddGlobalVariable(std::move(var0));
 
-  auto var1 = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var1",
-      ast::StorageClass::kPrivate, &f32);
-  var1->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 0)));
+  auto var1 =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var1",
+                            ast::StorageClass::kPrivate, &f32);
+  var1->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 0)));
   mod()->AddGlobalVariable(std::move(var1));
 
   EXPECT_TRUE(v()->ValidateGlobalVariables(mod()->global_variables()))
@@ -451,17 +440,17 @@
   // var global_var : i32 = 0;
   ast::type::F32Type f32;
   ast::type::I32Type i32;
-  auto var0 = std::make_unique<ast::Variable>(
-      "global_var", ast::StorageClass::kPrivate, &f32);
-  var0->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 0.1)));
+  auto var0 =
+      create<ast::Variable>("global_var", ast::StorageClass::kPrivate, &f32);
+  var0->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 0.1)));
   mod()->AddGlobalVariable(std::move(var0));
 
-  auto var1 = std::make_unique<ast::Variable>(
-      Source{Source::Location{12, 34}}, "global_var",
-      ast::StorageClass::kPrivate, &f32);
-  var1->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 0)));
+  auto var1 =
+      create<ast::Variable>(Source{Source::Location{12, 34}}, "global_var",
+                            ast::StorageClass::kPrivate, &f32);
+  var1->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 0)));
   mod()->AddGlobalVariable(std::move(var1));
 
   EXPECT_FALSE(v()->ValidateGlobalVariables(mod()->global_variables()));
@@ -475,21 +464,20 @@
   //  a = 2
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
   var->set_is_const(true);
 
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
   auto* rhs_ptr = rhs.get();
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_TRUE(td()->DetermineStatements(body.get())) << td()->error();
@@ -510,21 +498,18 @@
   ast::type::VoidType void_type;
   ast::type::F32Type f32;
   auto global_var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kPrivate, &f32);
-  global_var->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 2.1)));
+      create<ast::Variable>("a", ast::StorageClass::kPrivate, &f32);
+  global_var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.1)));
   mod()->AddGlobalVariable(std::move(global_var));
 
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
   ast::VariableList params;
-  auto func =
-      std::make_unique<ast::Function>("my_func", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(
+  auto func = create<ast::Function>("my_func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{12, 34}}, std::move(var)));
   func->set_body(std::move(body));
   auto* func_ptr = func.get();
@@ -544,23 +529,19 @@
   ast::type::VoidType void_type;
   ast::type::I32Type i32;
   ast::type::F32Type f32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2)));
 
-  auto var_a_float =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var_a_float->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 0.1)));
+  auto var_a_float = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var_a_float->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 0.1)));
 
   ast::VariableList params;
-  auto func =
-      std::make_unique<ast::Function>("my_func", std::move(params), &void_type);
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  body->append(std::make_unique<ast::VariableDeclStatement>(
+  auto func = create<ast::Function>("my_func", std::move(params), &void_type);
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
+  body->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{12, 34}}, std::move(var_a_float)));
   func->set_body(std::move(body));
   auto* func_ptr = func.get();
@@ -578,27 +559,24 @@
   // var a : f32 = 3.14;
   // }
   ast::type::F32Type f32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
 
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::BoolLiteral>(&bool_type, true));
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
+  auto cond = create<ast::ScalarConstructorExpression>(
+      create<ast::BoolLiteral>(&bool_type, true));
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
 
-  auto var_a_float =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var_a_float->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 3.14)));
+  auto var_a_float = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var_a_float->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14)));
 
-  auto outer_body = std::make_unique<ast::BlockStatement>();
+  auto outer_body = create<ast::BlockStatement>();
   outer_body->append(
-      std::make_unique<ast::IfStatement>(std::move(cond), std::move(body)));
-  outer_body->append(std::make_unique<ast::VariableDeclStatement>(
+      create<ast::IfStatement>(std::move(cond), std::move(body)));
+  outer_body->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{12, 34}}, std::move(var_a_float)));
 
   EXPECT_TRUE(td()->DetermineStatements(outer_body.get())) << td()->error();
@@ -613,29 +591,26 @@
   // if (true) { var a : f32 = 2.0; }
   // }
   ast::type::F32Type f32;
-  auto var_a_float =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var_a_float->set_constructor(
-      std::make_unique<ast::ScalarConstructorExpression>(
-          std::make_unique<ast::FloatLiteral>(&f32, 3.14)));
+  auto var_a_float = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var_a_float->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 3.14)));
 
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
 
   ast::type::BoolType bool_type;
-  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::BoolLiteral>(&bool_type, true));
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(
+  auto cond = create<ast::ScalarConstructorExpression>(
+      create<ast::BoolLiteral>(&bool_type, true));
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{12, 34}}, std::move(var)));
 
-  auto outer_body = std::make_unique<ast::BlockStatement>();
+  auto outer_body = create<ast::BlockStatement>();
   outer_body->append(
-      std::make_unique<ast::VariableDeclStatement>(std::move(var_a_float)));
+      create<ast::VariableDeclStatement>(std::move(var_a_float)));
   outer_body->append(
-      std::make_unique<ast::IfStatement>(std::move(cond), std::move(body)));
+      create<ast::IfStatement>(std::move(cond), std::move(body)));
 
   EXPECT_TRUE(td()->DetermineStatements(outer_body.get())) << td()->error();
   EXPECT_FALSE(v()->ValidateStatements(outer_body.get()));
@@ -647,35 +622,31 @@
   // func1 { var a : f32 = 3.0; return; }
   ast::type::F32Type f32;
   ast::type::VoidType void_type;
-  auto var0 =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &f32);
-  var0->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 2.0)));
+  auto var0 = create<ast::Variable>("a", ast::StorageClass::kNone, &f32);
+  var0->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 2.0)));
 
-  auto var1 = std::make_unique<ast::Variable>("a", ast::StorageClass::kNone,
-                                              &void_type);
-  var1->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::FloatLiteral>(&f32, 1.0)));
+  auto var1 = create<ast::Variable>("a", ast::StorageClass::kNone, &void_type);
+  var1->set_constructor(create<ast::ScalarConstructorExpression>(
+      create<ast::FloatLiteral>(&f32, 1.0)));
 
   ast::VariableList params0;
-  auto func0 =
-      std::make_unique<ast::Function>("func0", std::move(params0), &void_type);
-  auto body0 = std::make_unique<ast::BlockStatement>();
-  body0->append(std::make_unique<ast::VariableDeclStatement>(
+  auto func0 = create<ast::Function>("func0", std::move(params0), &void_type);
+  auto body0 = create<ast::BlockStatement>();
+  body0->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{12, 34}}, std::move(var0)));
-  body0->append(std::make_unique<ast::ReturnStatement>());
+  body0->append(create<ast::ReturnStatement>());
   func0->set_body(std::move(body0));
 
   ast::VariableList params1;
-  auto func1 =
-      std::make_unique<ast::Function>("func1", std::move(params1), &void_type);
-  auto body1 = std::make_unique<ast::BlockStatement>();
-  body1->append(std::make_unique<ast::VariableDeclStatement>(
+  auto func1 = create<ast::Function>("func1", std::move(params1), &void_type);
+  auto body1 = create<ast::BlockStatement>();
+  body1->append(create<ast::VariableDeclStatement>(
       Source{Source::Location{13, 34}}, std::move(var1)));
-  body1->append(std::make_unique<ast::ReturnStatement>());
+  body1->append(create<ast::ReturnStatement>());
   func1->set_body(std::move(body1));
-  func1->add_decoration(std::make_unique<ast::StageDecoration>(
-      ast::PipelineStage::kVertex, Source{}));
+  func1->add_decoration(
+      create<ast::StageDecoration>(ast::PipelineStage::kVertex, Source{}));
 
   mod()->AddFunction(std::move(func0));
   mod()->AddFunction(std::move(func1));
@@ -690,19 +661,18 @@
   // a = 2;
   // }
   ast::type::I32Type i32;
-  auto var =
-      std::make_unique<ast::Variable>("a", ast::StorageClass::kNone, &i32);
+  auto var = create<ast::Variable>("a", ast::StorageClass::kNone, &i32);
 
   td()->RegisterVariableForTesting(var.get());
-  auto lhs = std::make_unique<ast::IdentifierExpression>("a");
+  auto lhs = create<ast::IdentifierExpression>("a");
   auto* lhs_ptr = lhs.get();
-  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
-      std::make_unique<ast::SintLiteral>(&i32, 2));
+  auto rhs = create<ast::ScalarConstructorExpression>(
+      create<ast::SintLiteral>(&i32, 2));
   auto* rhs_ptr = rhs.get();
 
-  auto body = std::make_unique<ast::BlockStatement>();
-  body->append(std::make_unique<ast::VariableDeclStatement>(std::move(var)));
-  body->append(std::make_unique<ast::AssignmentStatement>(
+  auto body = create<ast::BlockStatement>();
+  body->append(create<ast::VariableDeclStatement>(std::move(var)));
+  body->append(create<ast::AssignmentStatement>(
       Source{Source::Location{12, 34}}, std::move(lhs), std::move(rhs)));
 
   EXPECT_TRUE(td()->DetermineStatements(body.get())) << td()->error();
diff --git a/src/validator/validator_test_helper.h b/src/validator/validator_test_helper.h
index 9e51c3f..26e91f3 100644
--- a/src/validator/validator_test_helper.h
+++ b/src/validator/validator_test_helper.h
@@ -16,6 +16,7 @@
 #define SRC_VALIDATOR_VALIDATOR_TEST_HELPER_H_
 
 #include <memory>
+#include <utility>
 
 #include "src/ast/type/void_type.h"
 #include "src/type_determiner.h"
@@ -40,6 +41,13 @@
   /// @return a pointer to the test module
   ast::Module* mod() { return &mod_; }
 
+  /// @return a `std::unique_ptr` to a new `T` constructed with `args`
+  /// @param args the arguments to forward to the constructor for `T`
+  template <typename T, typename... ARGS>
+  std::unique_ptr<T> create(ARGS&&... args) {
+    return std::make_unique<T>(std::forward<ARGS>(args)...);
+  }
+
  private:
   std::unique_ptr<ValidatorImpl> v_;
   Context ctx_;