src/tint/resolver/var_let_validation_test.cc - dawn - Git at Google

 // Copyright 2021 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/tint/resolver/resolver.h"
 #include "src/tint/resolver/resolver_test_helper.h"

 #include "gmock/gmock.h"

 using namespace tint::number_suffixes;  // NOLINT

 namespace tint::resolver {
 namespace {

 struct ResolverVarLetValidationTest : public resolver::TestHelper, public testing::Test {};

 TEST_F(ResolverVarLetValidationTest, LetNoInitializer) {
     // let a : i32;
     WrapInFunction(Let(Source{{12, 34}}, "a", ty.i32(), nullptr));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: let declaration must have an initializer");
 }

 TEST_F(ResolverVarLetValidationTest, GlobalLetNoInitializer) {
     // let a : i32;
     GlobalConst(Source{{12, 34}}, "a", ty.i32(), nullptr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: let declaration must have an initializer");
 }

 TEST_F(ResolverVarLetValidationTest, VarNoInitializerNoType) {
     // var a;
     WrapInFunction(Var(Source{{12, 34}}, "a", nullptr));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "12:34 error: function scope var declaration requires a type or "
               "initializer");
 }

 TEST_F(ResolverVarLetValidationTest, GlobalVarNoInitializerNoType) {
     // var a;
     Global(Source{{12, 34}}, "a", nullptr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "12:34 error: module scope var declaration requires a type and "
               "initializer");
 }

 TEST_F(ResolverVarLetValidationTest, VarTypeNotStorable) {
     // var i : i32;
     // var p : pointer<function, i32> = &v;
     auto* i = Var("i", ty.i32(), ast::StorageClass::kNone);
     auto* p = Var(Source{{56, 78}}, "a", ty.pointer<i32>(ast::StorageClass::kFunction),
                   ast::StorageClass::kNone, AddressOf(Source{{12, 34}}, "i"));
     WrapInFunction(i, p);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "56:78 error: ptr<function, i32, read_write> cannot be used as the "
               "type of a var");
 }

 TEST_F(ResolverVarLetValidationTest, LetTypeNotConstructible) {
     // @group(0) @binding(0) var t1 : texture_2d<f32>;
     // let t2 : t1;
     auto* t1 = Global("t1", ty.sampled_texture(ast::TextureDimension::k2d, ty.f32()),
                       GroupAndBinding(0, 0));
     auto* t2 = Let(Source{{56, 78}}, "t2", nullptr, Expr(t1));
     WrapInFunction(t2);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "56:78 error: texture_2d<f32> cannot be used as the type of a let");
 }

 TEST_F(ResolverVarLetValidationTest, LetConstructorWrongType) {
     // var v : i32 = 2u
     WrapInFunction(Let(Source{{3, 3}}, "v", ty.i32(), Expr(2_u)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(3:3 error: cannot initialize let of type 'i32' with value of type 'u32')");
 }

 TEST_F(ResolverVarLetValidationTest, VarConstructorWrongType) {
     // var v : i32 = 2u
     WrapInFunction(Var(Source{{3, 3}}, "v", ty.i32(), ast::StorageClass::kNone, Expr(2_u)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(3:3 error: cannot initialize var of type 'i32' with value of type 'u32')");
 }

 TEST_F(ResolverVarLetValidationTest, LetConstructorWrongTypeViaAlias) {
     auto* a = Alias("I32", ty.i32());
     WrapInFunction(Let(Source{{3, 3}}, "v", ty.Of(a), Expr(2_u)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(3:3 error: cannot initialize let of type 'i32' with value of type 'u32')");
 }

 TEST_F(ResolverVarLetValidationTest, VarConstructorWrongTypeViaAlias) {
     auto* a = Alias("I32", ty.i32());
     WrapInFunction(Var(Source{{3, 3}}, "v", ty.Of(a), ast::StorageClass::kNone, Expr(2_u)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(3:3 error: cannot initialize var of type 'i32' with value of type 'u32')");
 }

 TEST_F(ResolverVarLetValidationTest, LetOfPtrConstructedWithRef) {
     // var a : f32;
     // let b : ptr<function,f32> = a;
     const auto priv = ast::StorageClass::kFunction;
     auto* var_a = Var("a", ty.f32(), priv);
     auto* var_b = Let(Source{{12, 34}}, "b", ty.pointer<f32>(priv), Expr("a"), {});
     WrapInFunction(var_a, var_b);

     ASSERT_FALSE(r()->Resolve());

     EXPECT_EQ(
         r()->error(),
         R"(12:34 error: cannot initialize let of type 'ptr<function, f32, read_write>' with value of type 'f32')");
 }

 TEST_F(ResolverVarLetValidationTest, LocalLetRedeclared) {
     // let l : f32 = 1.;
     // let l : i32 = 0;
     auto* l1 = Let("l", ty.f32(), Expr(1_f));
     auto* l2 = Let(Source{{12, 34}}, "l", ty.i32(), Expr(0_i));
     WrapInFunction(l1, l2);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "12:34 error: redeclaration of 'l'\nnote: 'l' previously declared here");
 }

 TEST_F(ResolverVarLetValidationTest, GlobalVarRedeclaredAsLocal) {
     // var v : f32 = 2.1;
     // fn my_func() {
     //   var v : f32 = 2.0;
     //   return 0;
     // }

     Global("v", ty.f32(), ast::StorageClass::kPrivate, Expr(2.1_f));

     WrapInFunction(Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone, Expr(2_f)));

     EXPECT_TRUE(r()->Resolve()) << r()->error();
 }

 TEST_F(ResolverVarLetValidationTest, VarRedeclaredInInnerBlock) {
     // {
     //  var v : f32;
     //  { var v : f32; }
     // }
     auto* var_outer = Var("v", ty.f32(), ast::StorageClass::kNone);
     auto* var_inner = Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone);
     auto* inner = Block(Decl(var_inner));
     auto* outer_body = Block(Decl(var_outer), inner);

     WrapInFunction(outer_body);

     EXPECT_TRUE(r()->Resolve()) << r()->error();
 }

 TEST_F(ResolverVarLetValidationTest, VarRedeclaredInIfBlock) {
     // {
     //   var v : f32 = 3.14;
     //   if (true) { var v : f32 = 2.0; }
     // }
     auto* var_a_float = Var("v", ty.f32(), ast::StorageClass::kNone, Expr(3.1_f));

     auto* var = Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone, Expr(2_f));

     auto* cond = Expr(true);
     auto* body = Block(Decl(var));

     auto* outer_body = Block(Decl(var_a_float), If(cond, body));

     WrapInFunction(outer_body);

     EXPECT_TRUE(r()->Resolve()) << r()->error();
 }

 TEST_F(ResolverVarLetValidationTest, InferredPtrStorageAccessMismatch) {
     // struct Inner {
     //    arr: array<i32, 4>;
     // }
     // struct S {
     //    inner: Inner;
     // }
     // @group(0) @binding(0) var<storage> s : S;
     // fn f() {
     //   let p : pointer<storage, i32, read_write> = &s.inner.arr[2i];
     // }
     auto* inner = Structure("Inner", {Member("arr", ty.array<i32, 4>())});
     auto* buf = Structure("S", {Member("inner", ty.Of(inner))});
     auto* storage = Global("s", ty.Of(buf), ast::StorageClass::kStorage,
                            ast::AttributeList{
                                create<ast::BindingAttribute>(0),
                                create<ast::GroupAttribute>(0),
                            });

     auto* expr = IndexAccessor(MemberAccessor(MemberAccessor(storage, "inner"), "arr"), 2_i);
     auto* ptr =
         Let(Source{{12, 34}}, "p",
             ty.pointer<i32>(ast::StorageClass::kStorage, ast::Access::kReadWrite), AddressOf(expr));

     WrapInFunction(ptr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "12:34 error: cannot initialize let of type "
               "'ptr<storage, i32, read_write>' with value of type "
               "'ptr<storage, i32, read>'");
 }

 TEST_F(ResolverVarLetValidationTest, NonConstructibleType_Atomic) {
     auto* v = Var("v", ty.atomic(Source{{12, 34}}, ty.i32()));
     WrapInFunction(v);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: function variable must have a constructible type");
 }

 TEST_F(ResolverVarLetValidationTest, NonConstructibleType_RuntimeArray) {
     auto* s = Structure("S", {Member(Source{{56, 78}}, "m", ty.array(ty.i32()))});
     auto* v = Var(Source{{12, 34}}, "v", ty.Of(s));
     WrapInFunction(v);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: runtime-sized arrays can only be used in the <storage> storage class
 56:78 note: while analysing structure member S.m
 12:34 note: while instantiating variable v)");
 }

 TEST_F(ResolverVarLetValidationTest, NonConstructibleType_Struct_WithAtomic) {
     auto* s = Structure("S", {Member("m", ty.atomic(ty.i32()))});
     auto* v = Var("v", ty.Of(s));
     WrapInFunction(v);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "error: function variable must have a constructible type");
 }

 TEST_F(ResolverVarLetValidationTest, NonConstructibleType_InferredType) {
     // @group(0) @binding(0) var s : sampler;
     // fn foo() {
     //   var v = s;
     // }
     Global("s", ty.sampler(ast::SamplerKind::kSampler), GroupAndBinding(0, 0));
     auto* v = Var(Source{{12, 34}}, "v", nullptr, Expr("s"));
     WrapInFunction(v);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: function variable must have a constructible type");
 }

 TEST_F(ResolverVarLetValidationTest, InvalidStorageClassForInitializer) {
     // var<workgroup> v : f32 = 1.23;
     Global(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kWorkgroup, Expr(1.23_f));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               "12:34 error: var of storage class 'workgroup' cannot have "
               "an initializer. var initializers are only supported for the "
               "storage classes 'private' and 'function'");
 }

 TEST_F(ResolverVarLetValidationTest, VectorLetNoType) {
     // let a : mat3x3 = mat3x3<f32>();
     WrapInFunction(Let("a", create<ast::Vector>(Source{{12, 34}}, nullptr, 3), vec3<f32>()));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: missing vector element type");
 }

 TEST_F(ResolverVarLetValidationTest, VectorVarNoType) {
     // var a : mat3x3;
     WrapInFunction(Var("a", create<ast::Vector>(Source{{12, 34}}, nullptr, 3)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: missing vector element type");
 }

 TEST_F(ResolverVarLetValidationTest, MatrixLetNoType) {
     // let a : mat3x3 = mat3x3<f32>();
     WrapInFunction(Let("a", create<ast::Matrix>(Source{{12, 34}}, nullptr, 3, 3), mat3x3<f32>()));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: missing matrix element type");
 }

 TEST_F(ResolverVarLetValidationTest, MatrixVarNoType) {
     // var a : mat3x3;
     WrapInFunction(Var("a", create<ast::Matrix>(Source{{12, 34}}, nullptr, 3, 3)));

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), "12:34 error: missing matrix element type");
 }

 }  // namespace
 }  // namespace tint::resolver
	// Copyright 2021 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/tint/resolver/resolver.h"
	#include "src/tint/resolver/resolver_test_helper.h"

	#include "gmock/gmock.h"

	using namespace tint::number_suffixes; // NOLINT

	namespace tint::resolver {
	namespace {

	struct ResolverVarLetValidationTest : public resolver::TestHelper, public testing::Test {};

	TEST_F(ResolverVarLetValidationTest, LetNoInitializer) {
	// let a : i32;
	WrapInFunction(Let(Source{{12, 34}}, "a", ty.i32(), nullptr));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: let declaration must have an initializer");
	}

	TEST_F(ResolverVarLetValidationTest, GlobalLetNoInitializer) {
	// let a : i32;
	GlobalConst(Source{{12, 34}}, "a", ty.i32(), nullptr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: let declaration must have an initializer");
	}

	TEST_F(ResolverVarLetValidationTest, VarNoInitializerNoType) {
	// var a;
	WrapInFunction(Var(Source{{12, 34}}, "a", nullptr));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"12:34 error: function scope var declaration requires a type or "
	"initializer");
	}

	TEST_F(ResolverVarLetValidationTest, GlobalVarNoInitializerNoType) {
	// var a;
	Global(Source{{12, 34}}, "a", nullptr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"12:34 error: module scope var declaration requires a type and "
	"initializer");
	}

	TEST_F(ResolverVarLetValidationTest, VarTypeNotStorable) {
	// var i : i32;
	// var p : pointer<function, i32> = &v;
	auto* i = Var("i", ty.i32(), ast::StorageClass::kNone);
	auto* p = Var(Source{{56, 78}}, "a", ty.pointer<i32>(ast::StorageClass::kFunction),
	ast::StorageClass::kNone, AddressOf(Source{{12, 34}}, "i"));
	WrapInFunction(i, p);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"56:78 error: ptr<function, i32, read_write> cannot be used as the "
	"type of a var");
	}

	TEST_F(ResolverVarLetValidationTest, LetTypeNotConstructible) {
	// @group(0) @binding(0) var t1 : texture_2d<f32>;
	// let t2 : t1;
	auto* t1 = Global("t1", ty.sampled_texture(ast::TextureDimension::k2d, ty.f32()),
	GroupAndBinding(0, 0));
	auto* t2 = Let(Source{{56, 78}}, "t2", nullptr, Expr(t1));
	WrapInFunction(t2);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "56:78 error: texture_2d<f32> cannot be used as the type of a let");
	}

	TEST_F(ResolverVarLetValidationTest, LetConstructorWrongType) {
	// var v : i32 = 2u
	WrapInFunction(Let(Source{{3, 3}}, "v", ty.i32(), Expr(2_u)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(3:3 error: cannot initialize let of type 'i32' with value of type 'u32')");
	}

	TEST_F(ResolverVarLetValidationTest, VarConstructorWrongType) {
	// var v : i32 = 2u
	WrapInFunction(Var(Source{{3, 3}}, "v", ty.i32(), ast::StorageClass::kNone, Expr(2_u)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(3:3 error: cannot initialize var of type 'i32' with value of type 'u32')");
	}

	TEST_F(ResolverVarLetValidationTest, LetConstructorWrongTypeViaAlias) {
	auto* a = Alias("I32", ty.i32());
	WrapInFunction(Let(Source{{3, 3}}, "v", ty.Of(a), Expr(2_u)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(3:3 error: cannot initialize let of type 'i32' with value of type 'u32')");
	}

	TEST_F(ResolverVarLetValidationTest, VarConstructorWrongTypeViaAlias) {
	auto* a = Alias("I32", ty.i32());
	WrapInFunction(Var(Source{{3, 3}}, "v", ty.Of(a), ast::StorageClass::kNone, Expr(2_u)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(3:3 error: cannot initialize var of type 'i32' with value of type 'u32')");
	}

	TEST_F(ResolverVarLetValidationTest, LetOfPtrConstructedWithRef) {
	// var a : f32;
	// let b : ptr<function,f32> = a;
	const auto priv = ast::StorageClass::kFunction;
	auto* var_a = Var("a", ty.f32(), priv);
	auto* var_b = Let(Source{{12, 34}}, "b", ty.pointer<f32>(priv), Expr("a"), {});
	WrapInFunction(var_a, var_b);

	ASSERT_FALSE(r()->Resolve());

	EXPECT_EQ(
	r()->error(),
	R"(12:34 error: cannot initialize let of type 'ptr<function, f32, read_write>' with value of type 'f32')");
	}

	TEST_F(ResolverVarLetValidationTest, LocalLetRedeclared) {
	// let l : f32 = 1.;
	// let l : i32 = 0;
	auto* l1 = Let("l", ty.f32(), Expr(1_f));
	auto* l2 = Let(Source{{12, 34}}, "l", ty.i32(), Expr(0_i));
	WrapInFunction(l1, l2);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"12:34 error: redeclaration of 'l'\nnote: 'l' previously declared here");
	}

	TEST_F(ResolverVarLetValidationTest, GlobalVarRedeclaredAsLocal) {
	// var v : f32 = 2.1;
	// fn my_func() {
	// var v : f32 = 2.0;
	// return 0;
	// }

	Global("v", ty.f32(), ast::StorageClass::kPrivate, Expr(2.1_f));

	WrapInFunction(Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone, Expr(2_f)));

	EXPECT_TRUE(r()->Resolve()) << r()->error();
	}

	TEST_F(ResolverVarLetValidationTest, VarRedeclaredInInnerBlock) {
	// {
	// var v : f32;
	// { var v : f32; }
	// }
	auto* var_outer = Var("v", ty.f32(), ast::StorageClass::kNone);
	auto* var_inner = Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone);
	auto* inner = Block(Decl(var_inner));
	auto* outer_body = Block(Decl(var_outer), inner);

	WrapInFunction(outer_body);

	EXPECT_TRUE(r()->Resolve()) << r()->error();
	}

	TEST_F(ResolverVarLetValidationTest, VarRedeclaredInIfBlock) {
	// {
	// var v : f32 = 3.14;
	// if (true) { var v : f32 = 2.0; }
	// }
	auto* var_a_float = Var("v", ty.f32(), ast::StorageClass::kNone, Expr(3.1_f));

	auto* var = Var(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kNone, Expr(2_f));

	auto* cond = Expr(true);
	auto* body = Block(Decl(var));

	auto* outer_body = Block(Decl(var_a_float), If(cond, body));

	WrapInFunction(outer_body);

	EXPECT_TRUE(r()->Resolve()) << r()->error();
	}

	TEST_F(ResolverVarLetValidationTest, InferredPtrStorageAccessMismatch) {
	// struct Inner {
	// arr: array<i32, 4>;
	// }
	// struct S {
	// inner: Inner;
	// }
	// @group(0) @binding(0) var<storage> s : S;
	// fn f() {
	// let p : pointer<storage, i32, read_write> = &s.inner.arr[2i];
	// }
	auto* inner = Structure("Inner", {Member("arr", ty.array<i32, 4>())});
	auto* buf = Structure("S", {Member("inner", ty.Of(inner))});
	auto* storage = Global("s", ty.Of(buf), ast::StorageClass::kStorage,
	ast::AttributeList{
	create<ast::BindingAttribute>(0),
	create<ast::GroupAttribute>(0),
	});

	auto* expr = IndexAccessor(MemberAccessor(MemberAccessor(storage, "inner"), "arr"), 2_i);
	auto* ptr =
	Let(Source{{12, 34}}, "p",
	ty.pointer<i32>(ast::StorageClass::kStorage, ast::Access::kReadWrite), AddressOf(expr));

	WrapInFunction(ptr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"12:34 error: cannot initialize let of type "
	"'ptr<storage, i32, read_write>' with value of type "
	"'ptr<storage, i32, read>'");
	}

	TEST_F(ResolverVarLetValidationTest, NonConstructibleType_Atomic) {
	auto* v = Var("v", ty.atomic(Source{{12, 34}}, ty.i32()));
	WrapInFunction(v);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: function variable must have a constructible type");
	}

	TEST_F(ResolverVarLetValidationTest, NonConstructibleType_RuntimeArray) {
	auto* s = Structure("S", {Member(Source{{56, 78}}, "m", ty.array(ty.i32()))});
	auto* v = Var(Source{{12, 34}}, "v", ty.Of(s));
	WrapInFunction(v);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: runtime-sized arrays can only be used in the <storage> storage class
	56:78 note: while analysing structure member S.m
	12:34 note: while instantiating variable v)");
	}

	TEST_F(ResolverVarLetValidationTest, NonConstructibleType_Struct_WithAtomic) {
	auto* s = Structure("S", {Member("m", ty.atomic(ty.i32()))});
	auto* v = Var("v", ty.Of(s));
	WrapInFunction(v);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "error: function variable must have a constructible type");
	}

	TEST_F(ResolverVarLetValidationTest, NonConstructibleType_InferredType) {
	// @group(0) @binding(0) var s : sampler;
	// fn foo() {
	// var v = s;
	// }
	Global("s", ty.sampler(ast::SamplerKind::kSampler), GroupAndBinding(0, 0));
	auto* v = Var(Source{{12, 34}}, "v", nullptr, Expr("s"));
	WrapInFunction(v);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: function variable must have a constructible type");
	}

	TEST_F(ResolverVarLetValidationTest, InvalidStorageClassForInitializer) {
	// var<workgroup> v : f32 = 1.23;
	Global(Source{{12, 34}}, "v", ty.f32(), ast::StorageClass::kWorkgroup, Expr(1.23_f));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	"12:34 error: var of storage class 'workgroup' cannot have "
	"an initializer. var initializers are only supported for the "
	"storage classes 'private' and 'function'");
	}

	TEST_F(ResolverVarLetValidationTest, VectorLetNoType) {
	// let a : mat3x3 = mat3x3<f32>();
	WrapInFunction(Let("a", create<ast::Vector>(Source{{12, 34}}, nullptr, 3), vec3<f32>()));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: missing vector element type");
	}

	TEST_F(ResolverVarLetValidationTest, VectorVarNoType) {
	// var a : mat3x3;
	WrapInFunction(Var("a", create<ast::Vector>(Source{{12, 34}}, nullptr, 3)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: missing vector element type");
	}

	TEST_F(ResolverVarLetValidationTest, MatrixLetNoType) {
	// let a : mat3x3 = mat3x3<f32>();
	WrapInFunction(Let("a", create<ast::Matrix>(Source{{12, 34}}, nullptr, 3, 3), mat3x3<f32>()));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: missing matrix element type");
	}

	TEST_F(ResolverVarLetValidationTest, MatrixVarNoType) {
	// var a : mat3x3;
	WrapInFunction(Var("a", create<ast::Matrix>(Source{{12, 34}}, nullptr, 3, 3)));

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), "12:34 error: missing matrix element type");
	}

	} // namespace
	} // namespace tint::resolver