src/tint/lang/wgsl/reader/parser/assignment_stmt_test.cc - dawn - Git at Google

 // Copyright 2020 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 "src/tint/lang/wgsl/reader/parser/helper_test.h"

 namespace tint::wgsl::reader {
 namespace {

 TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToVariable) {
     auto p = parser("a = 123");
     auto e = p->variable_updating_statement();
     EXPECT_TRUE(e.matched);
     EXPECT_FALSE(e.errored);
     EXPECT_FALSE(p->has_error()) << p->error();
     ASSERT_NE(e.value, nullptr);

     auto* a = e->As<ast::AssignmentStatement>();
     ASSERT_NE(a, nullptr);
     ASSERT_NE(a->lhs, nullptr);
     ASSERT_NE(a->rhs, nullptr);

     EXPECT_EQ(a->source.range.begin.line, 1u);
     EXPECT_EQ(a->source.range.begin.column, 3u);
     EXPECT_EQ(a->source.range.end.line, 1u);
     EXPECT_EQ(a->source.range.end.column, 4u);

     ASSERT_TRUE(a->lhs->Is<ast::IdentifierExpression>());
     auto* ident_expr = a->lhs->As<ast::IdentifierExpression>();
     EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));

     ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
               ast::IntLiteralExpression::Suffix::kNone);
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToMember) {
     auto p = parser("a.b.c[2].d = 123");
     auto e = p->variable_updating_statement();
     EXPECT_TRUE(e.matched);
     EXPECT_FALSE(e.errored);
     EXPECT_FALSE(p->has_error()) << p->error();
     ASSERT_NE(e.value, nullptr);

     auto* a = e->As<ast::AssignmentStatement>();
     ASSERT_NE(a, nullptr);
     ASSERT_NE(a->lhs, nullptr);
     ASSERT_NE(a->rhs, nullptr);

     EXPECT_EQ(a->source.range.begin.line, 1u);
     EXPECT_EQ(a->source.range.begin.column, 12u);
     EXPECT_EQ(a->source.range.end.line, 1u);
     EXPECT_EQ(a->source.range.end.column, 13u);

     ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
               ast::IntLiteralExpression::Suffix::kNone);

     ASSERT_TRUE(a->lhs->Is<ast::MemberAccessorExpression>());
     auto* mem = a->lhs->As<ast::MemberAccessorExpression>();

     EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("d"));

     ASSERT_TRUE(mem->object->Is<ast::IndexAccessorExpression>());
     auto* idx = mem->object->As<ast::IndexAccessorExpression>();

     ASSERT_NE(idx->index, nullptr);
     ASSERT_TRUE(idx->index->Is<ast::IntLiteralExpression>());
     EXPECT_EQ(idx->index->As<ast::IntLiteralExpression>()->value, 2);

     ASSERT_TRUE(idx->object->Is<ast::MemberAccessorExpression>());
     mem = idx->object->As<ast::MemberAccessorExpression>();
     EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("c"));

     ASSERT_TRUE(mem->object->Is<ast::MemberAccessorExpression>());

     mem = mem->object->As<ast::MemberAccessorExpression>();
     ASSERT_TRUE(mem->object->Is<ast::IdentifierExpression>());
     auto* ident_expr = mem->object->As<ast::IdentifierExpression>();
     EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
     EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("b"));
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToPhony) {
     auto p = parser("_ = 123i");
     auto e = p->variable_updating_statement();
     EXPECT_TRUE(e.matched);
     EXPECT_FALSE(e.errored);
     EXPECT_FALSE(p->has_error()) << p->error();
     ASSERT_NE(e.value, nullptr);

     auto* a = e->As<ast::AssignmentStatement>();
     ASSERT_NE(a, nullptr);
     ASSERT_NE(a->lhs, nullptr);
     ASSERT_NE(a->rhs, nullptr);

     EXPECT_EQ(a->source.range.begin.line, 1u);
     EXPECT_EQ(a->source.range.begin.column, 3u);
     EXPECT_EQ(a->source.range.end.line, 1u);
     EXPECT_EQ(a->source.range.end.column, 4u);

     ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
               ast::IntLiteralExpression::Suffix::kI);

     ASSERT_TRUE(a->lhs->Is<ast::PhonyExpression>());
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Phony_CompoundOpFails) {
     auto p = parser("_ += 123i");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(e.value, nullptr);
     EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Phony_IncrementFails) {
     auto p = parser("_ ++");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(e.value, nullptr);
     EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Phony_EqualIncrementFails) {
     auto p = parser("_ = ++");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(e.value, nullptr);
     EXPECT_EQ(
         p->error(),
         "1:5: prefix increment and decrement operators are reserved for a future WGSL version");
 }

 struct CompoundData {
     std::string str;
     core::BinaryOp op;
 };
 using CompoundOpTest = WGSLParserTestWithParam<CompoundData>;
 TEST_P(CompoundOpTest, CompoundOp) {
     auto params = GetParam();
     auto p = parser("a " + params.str + " 123u");
     auto e = p->variable_updating_statement();
     EXPECT_TRUE(e.matched);
     EXPECT_FALSE(e.errored);
     EXPECT_FALSE(p->has_error()) << p->error();
     ASSERT_NE(e.value, nullptr);

     auto* a = e->As<ast::CompoundAssignmentStatement>();
     ASSERT_NE(a, nullptr);
     ASSERT_NE(a->lhs, nullptr);
     ASSERT_NE(a->rhs, nullptr);
     EXPECT_EQ(a->op, params.op);

     EXPECT_EQ(a->source.range.begin.line, 1u);
     EXPECT_EQ(a->source.range.begin.column, 3u);
     EXPECT_EQ(a->source.range.end.line, 1u);
     EXPECT_EQ(a->source.range.end.column, 3u + params.str.length());

     ASSERT_TRUE(a->lhs->Is<ast::IdentifierExpression>());
     auto* ident_expr = a->lhs->As<ast::IdentifierExpression>();
     EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));

     ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
     EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
               ast::IntLiteralExpression::Suffix::kU);
 }
 INSTANTIATE_TEST_SUITE_P(WGSLParserTest,
                          CompoundOpTest,
                          testing::Values(CompoundData{"+=", core::BinaryOp::kAdd},
                                          CompoundData{"-=", core::BinaryOp::kSubtract},
                                          CompoundData{"*=", core::BinaryOp::kMultiply},
                                          CompoundData{"/=", core::BinaryOp::kDivide},
                                          CompoundData{"%=", core::BinaryOp::kModulo},
                                          CompoundData{"&=", core::BinaryOp::kAnd},
                                          CompoundData{"|=", core::BinaryOp::kOr},
                                          CompoundData{"^=", core::BinaryOp::kXor},
                                          CompoundData{">>=", core::BinaryOp::kShiftRight},
                                          CompoundData{"<<=", core::BinaryOp::kShiftLeft}));

 TEST_F(WGSLParserTest, AssignmentStmt_MissingEqual) {
     auto p = parser("a.b.c[2].d 123");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(e.value, nullptr);
     EXPECT_EQ(p->error(), "1:12: expected '=' for assignment");
 }

 TEST_F(WGSLParserTest, AssignmentStmt_Compound_MissingEqual) {
     auto p = parser("a + 123");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(e.value, nullptr);
     EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
 }

 TEST_F(WGSLParserTest, AssignmentStmt_InvalidLHS) {
     auto p = parser("if (true) {} = 123");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_FALSE(e.errored);
     EXPECT_FALSE(p->has_error()) << p->error();
     EXPECT_EQ(e.value, nullptr);
 }

 TEST_F(WGSLParserTest, AssignmentStmt_InvalidRHS) {
     auto p = parser("a.b.c[2].d = if (true) {}");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_EQ(e.value, nullptr);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "1:14: unable to parse right side of assignment");
 }

 TEST_F(WGSLParserTest, AssignmentStmt_InvalidCompoundOp) {
     auto p = parser("a &&= true");
     auto e = p->variable_updating_statement();
     EXPECT_FALSE(e.matched);
     EXPECT_TRUE(e.errored);
     EXPECT_EQ(e.value, nullptr);
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
 }

 }  // namespace
 }  // namespace tint::wgsl::reader
	// Copyright 2020 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 "src/tint/lang/wgsl/reader/parser/helper_test.h"

	namespace tint::wgsl::reader {
	namespace {

	TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToVariable) {
	auto p = parser("a = 123");
	auto e = p->variable_updating_statement();
	EXPECT_TRUE(e.matched);
	EXPECT_FALSE(e.errored);
	EXPECT_FALSE(p->has_error()) << p->error();
	ASSERT_NE(e.value, nullptr);

	auto* a = e->As<ast::AssignmentStatement>();
	ASSERT_NE(a, nullptr);
	ASSERT_NE(a->lhs, nullptr);
	ASSERT_NE(a->rhs, nullptr);

	EXPECT_EQ(a->source.range.begin.line, 1u);
	EXPECT_EQ(a->source.range.begin.column, 3u);
	EXPECT_EQ(a->source.range.end.line, 1u);
	EXPECT_EQ(a->source.range.end.column, 4u);

	ASSERT_TRUE(a->lhs->Is<ast::IdentifierExpression>());
	auto* ident_expr = a->lhs->As<ast::IdentifierExpression>();
	EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));

	ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
	ast::IntLiteralExpression::Suffix::kNone);
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToMember) {
	auto p = parser("a.b.c[2].d = 123");
	auto e = p->variable_updating_statement();
	EXPECT_TRUE(e.matched);
	EXPECT_FALSE(e.errored);
	EXPECT_FALSE(p->has_error()) << p->error();
	ASSERT_NE(e.value, nullptr);

	auto* a = e->As<ast::AssignmentStatement>();
	ASSERT_NE(a, nullptr);
	ASSERT_NE(a->lhs, nullptr);
	ASSERT_NE(a->rhs, nullptr);

	EXPECT_EQ(a->source.range.begin.line, 1u);
	EXPECT_EQ(a->source.range.begin.column, 12u);
	EXPECT_EQ(a->source.range.end.line, 1u);
	EXPECT_EQ(a->source.range.end.column, 13u);

	ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
	ast::IntLiteralExpression::Suffix::kNone);

	ASSERT_TRUE(a->lhs->Is<ast::MemberAccessorExpression>());
	auto* mem = a->lhs->As<ast::MemberAccessorExpression>();

	EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("d"));

	ASSERT_TRUE(mem->object->Is<ast::IndexAccessorExpression>());
	auto* idx = mem->object->As<ast::IndexAccessorExpression>();

	ASSERT_NE(idx->index, nullptr);
	ASSERT_TRUE(idx->index->Is<ast::IntLiteralExpression>());
	EXPECT_EQ(idx->index->As<ast::IntLiteralExpression>()->value, 2);

	ASSERT_TRUE(idx->object->Is<ast::MemberAccessorExpression>());
	mem = idx->object->As<ast::MemberAccessorExpression>();
	EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("c"));

	ASSERT_TRUE(mem->object->Is<ast::MemberAccessorExpression>());

	mem = mem->object->As<ast::MemberAccessorExpression>();
	ASSERT_TRUE(mem->object->Is<ast::IdentifierExpression>());
	auto* ident_expr = mem->object->As<ast::IdentifierExpression>();
	EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));
	EXPECT_EQ(mem->member->symbol, p->builder().Symbols().Get("b"));
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Parses_ToPhony) {
	auto p = parser("_ = 123i");
	auto e = p->variable_updating_statement();
	EXPECT_TRUE(e.matched);
	EXPECT_FALSE(e.errored);
	EXPECT_FALSE(p->has_error()) << p->error();
	ASSERT_NE(e.value, nullptr);

	auto* a = e->As<ast::AssignmentStatement>();
	ASSERT_NE(a, nullptr);
	ASSERT_NE(a->lhs, nullptr);
	ASSERT_NE(a->rhs, nullptr);

	EXPECT_EQ(a->source.range.begin.line, 1u);
	EXPECT_EQ(a->source.range.begin.column, 3u);
	EXPECT_EQ(a->source.range.end.line, 1u);
	EXPECT_EQ(a->source.range.end.column, 4u);

	ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
	ast::IntLiteralExpression::Suffix::kI);

	ASSERT_TRUE(a->lhs->Is<ast::PhonyExpression>());
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Phony_CompoundOpFails) {
	auto p = parser("_ += 123i");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(e.value, nullptr);
	EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Phony_IncrementFails) {
	auto p = parser("_ ++");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(e.value, nullptr);
	EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Phony_EqualIncrementFails) {
	auto p = parser("_ = ++");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(e.value, nullptr);
	EXPECT_EQ(
	p->error(),
	"1:5: prefix increment and decrement operators are reserved for a future WGSL version");
	}

	struct CompoundData {
	std::string str;
	core::BinaryOp op;
	};
	using CompoundOpTest = WGSLParserTestWithParam<CompoundData>;
	TEST_P(CompoundOpTest, CompoundOp) {
	auto params = GetParam();
	auto p = parser("a " + params.str + " 123u");
	auto e = p->variable_updating_statement();
	EXPECT_TRUE(e.matched);
	EXPECT_FALSE(e.errored);
	EXPECT_FALSE(p->has_error()) << p->error();
	ASSERT_NE(e.value, nullptr);

	auto* a = e->As<ast::CompoundAssignmentStatement>();
	ASSERT_NE(a, nullptr);
	ASSERT_NE(a->lhs, nullptr);
	ASSERT_NE(a->rhs, nullptr);
	EXPECT_EQ(a->op, params.op);

	EXPECT_EQ(a->source.range.begin.line, 1u);
	EXPECT_EQ(a->source.range.begin.column, 3u);
	EXPECT_EQ(a->source.range.end.line, 1u);
	EXPECT_EQ(a->source.range.end.column, 3u + params.str.length());

	ASSERT_TRUE(a->lhs->Is<ast::IdentifierExpression>());
	auto* ident_expr = a->lhs->As<ast::IdentifierExpression>();
	EXPECT_EQ(ident_expr->identifier->symbol, p->builder().Symbols().Get("a"));

	ASSERT_TRUE(a->rhs->Is<ast::IntLiteralExpression>());
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->value, 123);
	EXPECT_EQ(a->rhs->As<ast::IntLiteralExpression>()->suffix,
	ast::IntLiteralExpression::Suffix::kU);
	}
	INSTANTIATE_TEST_SUITE_P(WGSLParserTest,
	CompoundOpTest,
	testing::Values(CompoundData{"+=", core::BinaryOp::kAdd},
	CompoundData{"-=", core::BinaryOp::kSubtract},
	CompoundData{"*=", core::BinaryOp::kMultiply},
	CompoundData{"/=", core::BinaryOp::kDivide},
	CompoundData{"%=", core::BinaryOp::kModulo},
	CompoundData{"&=", core::BinaryOp::kAnd},
	CompoundData{"\|=", core::BinaryOp::kOr},
	CompoundData{"^=", core::BinaryOp::kXor},
	CompoundData{">>=", core::BinaryOp::kShiftRight},
	CompoundData{"<<=", core::BinaryOp::kShiftLeft}));

	TEST_F(WGSLParserTest, AssignmentStmt_MissingEqual) {
	auto p = parser("a.b.c[2].d 123");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(e.value, nullptr);
	EXPECT_EQ(p->error(), "1:12: expected '=' for assignment");
	}

	TEST_F(WGSLParserTest, AssignmentStmt_Compound_MissingEqual) {
	auto p = parser("a + 123");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(e.value, nullptr);
	EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
	}

	TEST_F(WGSLParserTest, AssignmentStmt_InvalidLHS) {
	auto p = parser("if (true) {} = 123");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_FALSE(e.errored);
	EXPECT_FALSE(p->has_error()) << p->error();
	EXPECT_EQ(e.value, nullptr);
	}

	TEST_F(WGSLParserTest, AssignmentStmt_InvalidRHS) {
	auto p = parser("a.b.c[2].d = if (true) {}");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_EQ(e.value, nullptr);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "1:14: unable to parse right side of assignment");
	}

	TEST_F(WGSLParserTest, AssignmentStmt_InvalidCompoundOp) {
	auto p = parser("a &&= true");
	auto e = p->variable_updating_statement();
	EXPECT_FALSE(e.matched);
	EXPECT_TRUE(e.errored);
	EXPECT_EQ(e.value, nullptr);
	EXPECT_TRUE(p->has_error());
	EXPECT_EQ(p->error(), "1:3: expected '=' for assignment");
	}

	} // namespace
	} // namespace tint::wgsl::reader