src/tint/lang/wgsl/resolver/ptr_ref_validation_test.cc - dawn - Git at Google

 // Copyright 2021 The Dawn & Tint Authors
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 // 1. Redistributions of source code must retain the above copyright notice, this
 //    list of conditions and the following disclaimer.
 //
 // 2. Redistributions in binary form must reproduce the above copyright notice,
 //    this list of conditions and the following disclaimer in the documentation
 //    and/or other materials provided with the distribution.
 //
 // 3. Neither the name of the copyright holder nor the names of its
 //    contributors may be used to endorse or promote products derived from
 //    this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include "gmock/gmock.h"
 #include "src/tint/lang/core/type/reference.h"
 #include "src/tint/lang/core/type/texture_dimension.h"
 #include "src/tint/lang/wgsl/ast/bitcast_expression.h"
 #include "src/tint/lang/wgsl/resolver/resolver.h"
 #include "src/tint/lang/wgsl/resolver/resolver_helper_test.h"

 namespace tint::resolver {
 namespace {

 using namespace tint::core::fluent_types;     // NOLINT
 using namespace tint::core::number_suffixes;  // NOLINT

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

 TEST_F(ResolverPtrRefValidationTest, AddressOfLiteral) {
     // &1

     auto* expr = AddressOf(Expr(Source{{12, 34}}, 1_i));

     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of value of type 'i32')");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfLet) {
     // let l : i32 = 1;
     // &l
     auto* l = Let("l", ty.i32(), Expr(1_i));
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "l"));

     WrapInFunction(l, expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of let 'l')");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfConst) {
     // const c : i32 = 1;
     // &c
     auto* l = Const("c", ty.i32(), Expr(1_i));
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "c"));

     WrapInFunction(l, expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of const 'c')");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfOverride) {
     // override c : i32;
     // &o
     Override("o", ty.i32());
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "o"));

     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of override 'o')");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfParameter) {
     // fn F(p : i32) { _ = &p }
     // &F
     Func("F", Vector{Param("p", ty.i32())}, ty.void_(),
          Vector{
              Assign(Phony(), AddressOf(Expr(Source{{12, 34}}, "p"))),
          });

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of parameter 'p')");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfHandle) {
     // @group(0) @binding(0) var t: texture_3d<f32>;
     // &t
     GlobalVar("t", ty.sampled_texture(core::type::TextureDimension::k3d, ty.f32()), Group(0_a),
               Binding(0_a));
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "t"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot take the address of var 't' in handle address space)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfFunction) {
     // fn F() {}
     // &F
     Func("F", Empty, ty.void_(), Empty);
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "F"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot use function 'F' as value
 note: function 'F' declared here
 12:34 note: are you missing '()'?)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfBuiltinFunction) {
     // &max
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "max"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot use builtin function 'max' as value
 12:34 note: are you missing '()'?)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfType) {
     // &i32
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "i32"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot use type 'i32' as value
 12:34 note: are you missing '()'?)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfTypeAlias) {
     // alias T = i32
     // &T
     Alias("T", ty.i32());
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "T"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot use type 'i32' as value
 12:34 note: are you missing '()'?)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfAccess) {
     // &read_write
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "read_write"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot use access 'read_write' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfAddressSpace) {
     // &handle
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "uniform"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot use address space 'uniform' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfBuiltinValue) {
     // &position
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "position"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot use builtin value 'position' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfInterpolationSampling) {
     // &centroid
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "centroid"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot use interpolation sampling 'centroid' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfInterpolationType) {
     // &perspective
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "perspective"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot use interpolation type 'perspective' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfTexelFormat) {
     // &rgba8snorm
     auto* expr = AddressOf(Expr(Source{{12, 34}}, "rgba8snorm"));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(), R"(12:34 error: cannot use texel format 'rgba8snorm' as value)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfVectorComponent_MemberAccessor) {
     // var v : vec4<i32>;
     // &v.y
     auto* v = Var("v", ty.vec4<i32>());
     auto* expr = AddressOf(MemberAccessor(Source{{12, 34}}, "v", "y"));

     WrapInFunction(v, expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of a vector component)");
 }

 TEST_F(ResolverPtrRefValidationTest, AddressOfVectorComponent_IndexAccessor) {
     // var v : vec4<i32>;
     // &v[2i]
     auto* v = Var("v", ty.vec4<i32>());
     auto* expr = AddressOf(IndexAccessor(Source{{12, 34}}, "v", 2_i));

     WrapInFunction(v, expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of a vector component)");
 }

 TEST_F(ResolverPtrRefValidationTest, IndirectOfAddressOfHandle) {
     // @group(0) @binding(0) var t: texture_3d<f32>;
     // *&t
     GlobalVar("t", ty.sampled_texture(core::type::TextureDimension::k3d, ty.f32()), Group(0_a),
               Binding(0_a));
     auto* expr = Deref(AddressOf(Expr(Source{{12, 34}}, "t")));
     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());
     EXPECT_EQ(r()->error(),
               R"(12:34 error: cannot take the address of var 't' in handle address space)");
 }

 TEST_F(ResolverPtrRefValidationTest, DerefOfLiteral) {
     // *1

     auto* expr = Deref(Expr(Source{{12, 34}}, 1_i));

     WrapInFunction(expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot dereference expression of type 'i32')");
 }

 TEST_F(ResolverPtrRefValidationTest, DerefOfVar) {
     // var v : i32;
     // *v
     auto* v = Var("v", ty.i32());
     auto* expr = Deref(Expr(Source{{12, 34}}, "v"));

     WrapInFunction(v, expr);

     EXPECT_FALSE(r()->Resolve());

     EXPECT_EQ(r()->error(), R"(12:34 error: cannot dereference expression of type 'i32')");
 }

 TEST_F(ResolverPtrRefValidationTest, InferredPtrAccessMismatch) {
     // struct Inner {
     //    arr: array<i32, 4u>;
     // }
     // struct S {
     //    inner: Inner;
     // }
     // @group(0) @binding(0) var<storage, read_write> s : S;
     // fn f() {
     //   let p : pointer<storage, i32> = &s.inner.arr[2i];
     // }
     auto* inner = Structure("Inner", Vector{Member("arr", ty.array<i32, 4>())});
     auto* buf = Structure("S", Vector{Member("inner", ty.Of(inner))});
     auto* var = GlobalVar("s", ty.Of(buf), core::AddressSpace::kStorage, core::Access::kReadWrite,
                           Binding(0_a), Group(0_a));

     auto* expr = IndexAccessor(MemberAccessor(MemberAccessor(var, "inner"), "arr"), 2_i);
     auto* ptr = Let(Source{{12, 34}}, "p", ty.ptr<storage, i32>(), AddressOf(expr));

     WrapInFunction(ptr);

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

 }  // namespace
 }  // namespace tint::resolver
	// Copyright 2021 The Dawn & Tint Authors
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// 1. Redistributions of source code must retain the above copyright notice, this
	// list of conditions and the following disclaimer.
	//
	// 2. Redistributions in binary form must reproduce the above copyright notice,
	// this list of conditions and the following disclaimer in the documentation
	// and/or other materials provided with the distribution.
	//
	// 3. Neither the name of the copyright holder nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#include "gmock/gmock.h"
	#include "src/tint/lang/core/type/reference.h"
	#include "src/tint/lang/core/type/texture_dimension.h"
	#include "src/tint/lang/wgsl/ast/bitcast_expression.h"
	#include "src/tint/lang/wgsl/resolver/resolver.h"
	#include "src/tint/lang/wgsl/resolver/resolver_helper_test.h"

	namespace tint::resolver {
	namespace {

	using namespace tint::core::fluent_types; // NOLINT
	using namespace tint::core::number_suffixes; // NOLINT

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

	TEST_F(ResolverPtrRefValidationTest, AddressOfLiteral) {
	// &1

	auto* expr = AddressOf(Expr(Source{{12, 34}}, 1_i));

	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of value of type 'i32')");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfLet) {
	// let l : i32 = 1;
	// &l
	auto* l = Let("l", ty.i32(), Expr(1_i));
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "l"));

	WrapInFunction(l, expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of let 'l')");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfConst) {
	// const c : i32 = 1;
	// &c
	auto* l = Const("c", ty.i32(), Expr(1_i));
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "c"));

	WrapInFunction(l, expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of const 'c')");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfOverride) {
	// override c : i32;
	// &o
	Override("o", ty.i32());
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "o"));

	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of override 'o')");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfParameter) {
	// fn F(p : i32) { _ = &p }
	// &F
	Func("F", Vector{Param("p", ty.i32())}, ty.void_(),
	Vector{
	Assign(Phony(), AddressOf(Expr(Source{{12, 34}}, "p"))),
	});

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of parameter 'p')");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfHandle) {
	// @group(0) @binding(0) var t: texture_3d<f32>;
	// &t
	GlobalVar("t", ty.sampled_texture(core::type::TextureDimension::k3d, ty.f32()), Group(0_a),
	Binding(0_a));
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "t"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot take the address of var 't' in handle address space)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfFunction) {
	// fn F() {}
	// &F
	Func("F", Empty, ty.void_(), Empty);
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "F"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot use function 'F' as value
	note: function 'F' declared here
	12:34 note: are you missing '()'?)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfBuiltinFunction) {
	// &max
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "max"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot use builtin function 'max' as value
	12:34 note: are you missing '()'?)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfType) {
	// &i32
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "i32"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot use type 'i32' as value
	12:34 note: are you missing '()'?)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfTypeAlias) {
	// alias T = i32
	// &T
	Alias("T", ty.i32());
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "T"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot use type 'i32' as value
	12:34 note: are you missing '()'?)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfAccess) {
	// &read_write
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "read_write"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot use access 'read_write' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfAddressSpace) {
	// &handle
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "uniform"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot use address space 'uniform' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfBuiltinValue) {
	// &position
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "position"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot use builtin value 'position' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfInterpolationSampling) {
	// &centroid
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "centroid"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot use interpolation sampling 'centroid' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfInterpolationType) {
	// &perspective
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "perspective"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot use interpolation type 'perspective' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfTexelFormat) {
	// &rgba8snorm
	auto* expr = AddressOf(Expr(Source{{12, 34}}, "rgba8snorm"));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(), R"(12:34 error: cannot use texel format 'rgba8snorm' as value)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfVectorComponent_MemberAccessor) {
	// var v : vec4<i32>;
	// &v.y
	auto* v = Var("v", ty.vec4<i32>());
	auto* expr = AddressOf(MemberAccessor(Source{{12, 34}}, "v", "y"));

	WrapInFunction(v, expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of a vector component)");
	}

	TEST_F(ResolverPtrRefValidationTest, AddressOfVectorComponent_IndexAccessor) {
	// var v : vec4<i32>;
	// &v[2i]
	auto* v = Var("v", ty.vec4<i32>());
	auto* expr = AddressOf(IndexAccessor(Source{{12, 34}}, "v", 2_i));

	WrapInFunction(v, expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot take the address of a vector component)");
	}

	TEST_F(ResolverPtrRefValidationTest, IndirectOfAddressOfHandle) {
	// @group(0) @binding(0) var t: texture_3d<f32>;
	// *&t
	GlobalVar("t", ty.sampled_texture(core::type::TextureDimension::k3d, ty.f32()), Group(0_a),
	Binding(0_a));
	auto* expr = Deref(AddressOf(Expr(Source{{12, 34}}, "t")));
	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());
	EXPECT_EQ(r()->error(),
	R"(12:34 error: cannot take the address of var 't' in handle address space)");
	}

	TEST_F(ResolverPtrRefValidationTest, DerefOfLiteral) {
	// *1

	auto* expr = Deref(Expr(Source{{12, 34}}, 1_i));

	WrapInFunction(expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot dereference expression of type 'i32')");
	}

	TEST_F(ResolverPtrRefValidationTest, DerefOfVar) {
	// var v : i32;
	// *v
	auto* v = Var("v", ty.i32());
	auto* expr = Deref(Expr(Source{{12, 34}}, "v"));

	WrapInFunction(v, expr);

	EXPECT_FALSE(r()->Resolve());

	EXPECT_EQ(r()->error(), R"(12:34 error: cannot dereference expression of type 'i32')");
	}

	TEST_F(ResolverPtrRefValidationTest, InferredPtrAccessMismatch) {
	// struct Inner {
	// arr: array<i32, 4u>;
	// }
	// struct S {
	// inner: Inner;
	// }
	// @group(0) @binding(0) var<storage, read_write> s : S;
	// fn f() {
	// let p : pointer<storage, i32> = &s.inner.arr[2i];
	// }
	auto* inner = Structure("Inner", Vector{Member("arr", ty.array<i32, 4>())});
	auto* buf = Structure("S", Vector{Member("inner", ty.Of(inner))});
	auto* var = GlobalVar("s", ty.Of(buf), core::AddressSpace::kStorage, core::Access::kReadWrite,
	Binding(0_a), Group(0_a));

	auto* expr = IndexAccessor(MemberAccessor(MemberAccessor(var, "inner"), "arr"), 2_i);
	auto* ptr = Let(Source{{12, 34}}, "p", ty.ptr<storage, i32>(), AddressOf(expr));

	WrapInFunction(ptr);

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

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