diff --git a/src/tint/writer/glsl/generator.cc b/src/tint/writer/glsl/generator.cc
index 9ae88adc1b..ad06ac4e90 100644
--- a/src/tint/writer/glsl/generator.cc
+++ b/src/tint/writer/glsl/generator.cc
@@ -19,9 +19,7 @@
 #include "src/tint/transform/glsl.h"
 #include "src/tint/writer/glsl/generator_impl.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 
 Options::Options() = default;
 Options::~Options() = default;
@@ -71,6 +69,4 @@ Result Generate(const Program* program,
   return result;
 }
 
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator.h b/src/tint/writer/glsl/generator.h
index 88be42993b..19c3d8d99a 100644
--- a/src/tint/writer/glsl/generator.h
+++ b/src/tint/writer/glsl/generator.h
@@ -28,16 +28,15 @@
 #include "src/tint/writer/glsl/version.h"
 #include "src/tint/writer/text.h"
 
+// Forward declarations
 namespace tint {
-
-// Forward declarations
 class Program;
-
-namespace writer {
-namespace glsl {
-
-// Forward declarations
+namespace writer::glsl {
 class GeneratorImpl;
+}  // namespace writer::glsl
+}  // namespace tint
+
+namespace tint::writer::glsl {
 
 using BindingMap = std::unordered_map<sem::SamplerTexturePair, std::string>;
 
@@ -112,8 +111,6 @@ Result Generate(const Program* program,
                 const Options& options,
                 const std::string& entry_point);
 
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
 
 #endif  // SRC_TINT_WRITER_GLSL_GENERATOR_H_
diff --git a/src/tint/writer/glsl/generator_impl.cc b/src/tint/writer/glsl/generator_impl.cc
index 05fd7613b3..729a8c07b4 100644
--- a/src/tint/writer/glsl/generator_impl.cc
+++ b/src/tint/writer/glsl/generator_impl.cc
@@ -75,9 +75,7 @@ bool RequiresOESSampleVariables(tint::ast::Builtin builtin) {
 
 }  // namespace
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 const char kTempNamePrefix[] = "tint_tmp";
@@ -2890,6 +2888,4 @@ sem::Type* GeneratorImpl::BoolTypeToUint(const sem::Type* type) {
   }
 }
 
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl.h b/src/tint/writer/glsl/generator_impl.h
index b158391083..37be658229 100644
--- a/src/tint/writer/glsl/generator_impl.h
+++ b/src/tint/writer/glsl/generator_impl.h
@@ -38,18 +38,15 @@
 #include "src/tint/writer/glsl/version.h"
 #include "src/tint/writer/text_generator.h"
 
-namespace tint {
-
 // Forward declarations
-namespace sem {
+namespace tint::sem {
 class Call;
 class Builtin;
 class TypeConstructor;
 class TypeConversion;
-}  // namespace sem
+}  // namespace tint::sem
 
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 
 /// Implementation class for GLSL generator
 class GeneratorImpl : public TextGenerator {
@@ -500,8 +497,6 @@ class GeneratorImpl : public TextGenerator {
   Version version_;
 };
 
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
 
 #endif  // SRC_TINT_WRITER_GLSL_GENERATOR_IMPL_H_
diff --git a/src/tint/writer/glsl/generator_impl_array_accessor_test.cc b/src/tint/writer/glsl/generator_impl_array_accessor_test.cc
index 484685c7bf..7858f9bd9e 100644
--- a/src/tint/writer/glsl/generator_impl_array_accessor_test.cc
+++ b/src/tint/writer/glsl/generator_impl_array_accessor_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Expression = TestHelper;
@@ -34,6 +32,4 @@ TEST_F(GlslGeneratorImplTest_Expression, IndexAccessor) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_assign_test.cc b/src/tint/writer/glsl/generator_impl_assign_test.cc
index 2b55ceb540..c0da89ee96 100644
--- a/src/tint/writer/glsl/generator_impl_assign_test.cc
+++ b/src/tint/writer/glsl/generator_impl_assign_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Assign = TestHelper;
@@ -36,6 +34,4 @@ TEST_F(GlslGeneratorImplTest_Assign, Emit_Assign) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_binary_test.cc b/src/tint/writer/glsl/generator_impl_binary_test.cc
index ad11beb17f..744eef48af 100644
--- a/src/tint/writer/glsl/generator_impl_binary_test.cc
+++ b/src/tint/writer/glsl/generator_impl_binary_test.cc
@@ -16,9 +16,7 @@
 #include "src/tint/ast/variable_decl_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Binary = TestHelper;
@@ -541,6 +539,4 @@ foo((tint_tmp), (tint_tmp_1), (tint_tmp_2));
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_bitcast_test.cc b/src/tint/writer/glsl/generator_impl_bitcast_test.cc
index 15667302ed..c0fcfb4a34 100644
--- a/src/tint/writer/glsl/generator_impl_bitcast_test.cc
+++ b/src/tint/writer/glsl/generator_impl_bitcast_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Bitcast = TestHelper;
@@ -55,6 +53,4 @@ TEST_F(GlslGeneratorImplTest_Bitcast, EmitExpression_Bitcast_Uint) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_block_test.cc b/src/tint/writer/glsl/generator_impl_block_test.cc
index 8a9a504e86..cdfc9259f4 100644
--- a/src/tint/writer/glsl/generator_impl_block_test.cc
+++ b/src/tint/writer/glsl/generator_impl_block_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Block = TestHelper;
@@ -37,6 +35,4 @@ TEST_F(GlslGeneratorImplTest_Block, Emit_Block) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_break_test.cc b/src/tint/writer/glsl/generator_impl_break_test.cc
index 32a2a6554f..7e716a23a0 100644
--- a/src/tint/writer/glsl/generator_impl_break_test.cc
+++ b/src/tint/writer/glsl/generator_impl_break_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Break = TestHelper;
@@ -34,6 +32,4 @@ TEST_F(GlslGeneratorImplTest_Break, Emit_Break) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_builtin_test.cc b/src/tint/writer/glsl/generator_impl_builtin_test.cc
index 9fdce03524..3b313263f2 100644
--- a/src/tint/writer/glsl/generator_impl_builtin_test.cc
+++ b/src/tint/writer/glsl/generator_impl_builtin_test.cc
@@ -18,9 +18,7 @@
 #include "src/tint/sem/call.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using BuiltinType = sem::BuiltinType;
@@ -877,6 +875,4 @@ void main() {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_builtin_texture_test.cc b/src/tint/writer/glsl/generator_impl_builtin_texture_test.cc
index 78d7267458..a94eb67f76 100644
--- a/src/tint/writer/glsl/generator_impl_builtin_texture_test.cc
+++ b/src/tint/writer/glsl/generator_impl_builtin_texture_test.cc
@@ -18,9 +18,7 @@
 #include "src/tint/ast/stage_attribute.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using ::testing::HasSubstr;
@@ -299,6 +297,4 @@ INSTANTIATE_TEST_SUITE_P(
     testing::ValuesIn(ast::builtin::test::TextureOverloadCase::ValidCases()));
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_call_test.cc b/src/tint/writer/glsl/generator_impl_call_test.cc
index bf1fefaa54..fc74bb9c0a 100644
--- a/src/tint/writer/glsl/generator_impl_call_test.cc
+++ b/src/tint/writer/glsl/generator_impl_call_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/ast/call_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Call = TestHelper;
@@ -76,6 +74,4 @@ TEST_F(GlslGeneratorImplTest_Call, EmitStatement_Call) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_case_test.cc b/src/tint/writer/glsl/generator_impl_case_test.cc
index 9814ff053f..ecf39371b3 100644
--- a/src/tint/writer/glsl/generator_impl_case_test.cc
+++ b/src/tint/writer/glsl/generator_impl_case_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/ast/fallthrough_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Case = TestHelper;
@@ -103,6 +101,4 @@ TEST_F(GlslGeneratorImplTest_Case, Emit_Case_Default) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_cast_test.cc b/src/tint/writer/glsl/generator_impl_cast_test.cc
index 21fb8ba706..8228af6855 100644
--- a/src/tint/writer/glsl/generator_impl_cast_test.cc
+++ b/src/tint/writer/glsl/generator_impl_cast_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Cast = TestHelper;
@@ -44,6 +42,4 @@ TEST_F(GlslGeneratorImplTest_Cast, EmitExpression_Cast_Vector) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_constructor_test.cc b/src/tint/writer/glsl/generator_impl_constructor_test.cc
index ff90549968..51f29434d7 100644
--- a/src/tint/writer/glsl/generator_impl_constructor_test.cc
+++ b/src/tint/writer/glsl/generator_impl_constructor_test.cc
@@ -15,9 +15,7 @@
 #include "gmock/gmock.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using ::testing::HasSubstr;
@@ -235,6 +233,4 @@ TEST_F(GlslGeneratorImplTest_Constructor, EmitConstructor_Type_Struct_Empty) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_continue_test.cc b/src/tint/writer/glsl/generator_impl_continue_test.cc
index 675b408b3c..961aec5c71 100644
--- a/src/tint/writer/glsl/generator_impl_continue_test.cc
+++ b/src/tint/writer/glsl/generator_impl_continue_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Continue = TestHelper;
@@ -41,6 +39,4 @@ TEST_F(GlslGeneratorImplTest_Continue, Emit_Continue) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_discard_test.cc b/src/tint/writer/glsl/generator_impl_discard_test.cc
index f218c9e0bd..7f3f183905 100644
--- a/src/tint/writer/glsl/generator_impl_discard_test.cc
+++ b/src/tint/writer/glsl/generator_impl_discard_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Discard = TestHelper;
@@ -34,6 +32,4 @@ TEST_F(GlslGeneratorImplTest_Discard, Emit_Discard) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_function_test.cc b/src/tint/writer/glsl/generator_impl_function_test.cc
index 6a42143a1d..c9aa3b9ef0 100644
--- a/src/tint/writer/glsl/generator_impl_function_test.cc
+++ b/src/tint/writer/glsl/generator_impl_function_test.cc
@@ -20,9 +20,7 @@
 
 using ::testing::HasSubstr;
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Function = TestHelper;
@@ -984,6 +982,4 @@ void main_1() {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_identifier_test.cc b/src/tint/writer/glsl/generator_impl_identifier_test.cc
index cf86f6501c..18369cbc72 100644
--- a/src/tint/writer/glsl/generator_impl_identifier_test.cc
+++ b/src/tint/writer/glsl/generator_impl_identifier_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Identifier = TestHelper;
@@ -35,6 +33,4 @@ TEST_F(GlslGeneratorImplTest_Identifier, EmitIdentifierExpression) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_if_test.cc b/src/tint/writer/glsl/generator_impl_if_test.cc
index e44a2bcb76..69759433b8 100644
--- a/src/tint/writer/glsl/generator_impl_if_test.cc
+++ b/src/tint/writer/glsl/generator_impl_if_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_If = TestHelper;
@@ -130,6 +128,4 @@ TEST_F(GlslGeneratorImplTest_If, Emit_IfWithMultiple) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_import_test.cc b/src/tint/writer/glsl/generator_impl_import_test.cc
index 54f9a77b28..b2cdf55176 100644
--- a/src/tint/writer/glsl/generator_impl_import_test.cc
+++ b/src/tint/writer/glsl/generator_impl_import_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Import = TestHelper;
@@ -276,6 +274,4 @@ TEST_F(GlslGeneratorImplTest_Import, GlslImportData_Determinant) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_loop_test.cc b/src/tint/writer/glsl/generator_impl_loop_test.cc
index bbe8749580..a8fa039232 100644
--- a/src/tint/writer/glsl/generator_impl_loop_test.cc
+++ b/src/tint/writer/glsl/generator_impl_loop_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/ast/variable_decl_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Loop = TestHelper;
@@ -385,6 +383,4 @@ TEST_F(GlslGeneratorImplTest_Loop, Emit_ForLoopWithMultiStmtInitCondCont) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_member_accessor_test.cc b/src/tint/writer/glsl/generator_impl_member_accessor_test.cc
index e297050c35..f46779864f 100644
--- a/src/tint/writer/glsl/generator_impl_member_accessor_test.cc
+++ b/src/tint/writer/glsl/generator_impl_member_accessor_test.cc
@@ -16,9 +16,7 @@
 #include "src/tint/ast/stage_attribute.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using ::testing::HasSubstr;
@@ -879,6 +877,4 @@ TEST_F(GlslGeneratorImplTest_MemberAccessor, Swizzle_gbr) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_module_constant_test.cc b/src/tint/writer/glsl/generator_impl_module_constant_test.cc
index a636041167..bf9c74c714 100644
--- a/src/tint/writer/glsl/generator_impl_module_constant_test.cc
+++ b/src/tint/writer/glsl/generator_impl_module_constant_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/ast/id_attribute.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_ModuleConstant = TestHelper;
@@ -87,6 +85,4 @@ const float b = WGSL_SPEC_CONSTANT_1;
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_return_test.cc b/src/tint/writer/glsl/generator_impl_return_test.cc
index 414f0e1308..760188a9f8 100644
--- a/src/tint/writer/glsl/generator_impl_return_test.cc
+++ b/src/tint/writer/glsl/generator_impl_return_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Return = TestHelper;
@@ -46,6 +44,4 @@ TEST_F(GlslGeneratorImplTest_Return, Emit_ReturnWithValue) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_sanitizer_test.cc b/src/tint/writer/glsl/generator_impl_sanitizer_test.cc
index 6447d2c11b..812806f8f4 100644
--- a/src/tint/writer/glsl/generator_impl_sanitizer_test.cc
+++ b/src/tint/writer/glsl/generator_impl_sanitizer_test.cc
@@ -17,9 +17,7 @@
 #include "src/tint/ast/variable_decl_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslSanitizerTest = TestHelper;
@@ -328,6 +326,4 @@ void main() {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_storage_buffer_test.cc b/src/tint/writer/glsl/generator_impl_storage_buffer_test.cc
index be4e7c8d43..00bca6c523 100644
--- a/src/tint/writer/glsl/generator_impl_storage_buffer_test.cc
+++ b/src/tint/writer/glsl/generator_impl_storage_buffer_test.cc
@@ -17,9 +17,7 @@
 
 using ::testing::HasSubstr;
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_StorageBuffer = TestHelper;
@@ -92,6 +90,4 @@ layout(binding = 0, std430) buffer Nephews_1 {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_switch_test.cc b/src/tint/writer/glsl/generator_impl_switch_test.cc
index f18587144a..e49c08ce06 100644
--- a/src/tint/writer/glsl/generator_impl_switch_test.cc
+++ b/src/tint/writer/glsl/generator_impl_switch_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_Switch = TestHelper;
@@ -59,6 +57,4 @@ TEST_F(GlslGeneratorImplTest_Switch, Emit_Switch) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_test.cc b/src/tint/writer/glsl/generator_impl_test.cc
index fe5acb02bb..cecfa92677 100644
--- a/src/tint/writer/glsl/generator_impl_test.cc
+++ b/src/tint/writer/glsl/generator_impl_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest = TestHelper;
@@ -95,6 +93,4 @@ int my_func() {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_type_test.cc b/src/tint/writer/glsl/generator_impl_type_test.cc
index c6d7e86e74..c6dbf539f8 100644
--- a/src/tint/writer/glsl/generator_impl_type_test.cc
+++ b/src/tint/writer/glsl/generator_impl_type_test.cc
@@ -22,9 +22,7 @@
 #include "src/tint/sem/storage_texture_type.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using ::testing::HasSubstr;
@@ -537,6 +535,4 @@ INSTANTIATE_TEST_SUITE_P(
                                ast::TexelFormat::kRgba32Sint, "image1D tex;"}));
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_unary_op_test.cc b/src/tint/writer/glsl/generator_impl_unary_op_test.cc
index 5f84322857..2743ad18d1 100644
--- a/src/tint/writer/glsl/generator_impl_unary_op_test.cc
+++ b/src/tint/writer/glsl/generator_impl_unary_op_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslUnaryOpTest = TestHelper;
@@ -88,6 +86,4 @@ TEST_F(GlslUnaryOpTest, Negation) {
   EXPECT_EQ(out.str(), "-(expr)");
 }
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_uniform_buffer_test.cc b/src/tint/writer/glsl/generator_impl_uniform_buffer_test.cc
index 32e484ef11..b7a5f88814 100644
--- a/src/tint/writer/glsl/generator_impl_uniform_buffer_test.cc
+++ b/src/tint/writer/glsl/generator_impl_uniform_buffer_test.cc
@@ -17,9 +17,7 @@
 
 using ::testing::HasSubstr;
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using GlslGeneratorImplTest_UniformBuffer = TestHelper;
@@ -67,6 +65,4 @@ layout(binding = 0, std140) uniform Simple_1 {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_variable_decl_statement_test.cc b/src/tint/writer/glsl/generator_impl_variable_decl_statement_test.cc
index 64c3b02013..29d5a41095 100644
--- a/src/tint/writer/glsl/generator_impl_variable_decl_statement_test.cc
+++ b/src/tint/writer/glsl/generator_impl_variable_decl_statement_test.cc
@@ -16,9 +16,7 @@
 #include "src/tint/ast/variable_decl_statement.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 
 using ::testing::HasSubstr;
@@ -124,6 +122,4 @@ TEST_F(GlslGeneratorImplTest_VariableDecl,
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/generator_impl_workgroup_var_test.cc b/src/tint/writer/glsl/generator_impl_workgroup_var_test.cc
index c33b168096..9c5a51b519 100644
--- a/src/tint/writer/glsl/generator_impl_workgroup_var_test.cc
+++ b/src/tint/writer/glsl/generator_impl_workgroup_var_test.cc
@@ -17,9 +17,7 @@
 #include "src/tint/ast/stage_attribute.h"
 #include "src/tint/writer/glsl/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 namespace {
 using ::testing::HasSubstr;
 
@@ -56,6 +54,4 @@ TEST_F(GlslGeneratorImplTest_WorkgroupVar, Aliased) {
 }
 
 }  // namespace
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
diff --git a/src/tint/writer/glsl/test_helper.h b/src/tint/writer/glsl/test_helper.h
index cea266e43d..969490aa38 100644
--- a/src/tint/writer/glsl/test_helper.h
+++ b/src/tint/writer/glsl/test_helper.h
@@ -24,9 +24,7 @@
 #include "src/tint/transform/manager.h"
 #include "src/tint/writer/glsl/generator_impl.h"
 
-namespace tint {
-namespace writer {
-namespace glsl {
+namespace tint::writer::glsl {
 
 /// Helper class for testing
 template <typename BODY>
@@ -102,8 +100,6 @@ using TestHelper = TestHelperBase<testing::Test>;
 template <typename T>
 using TestParamHelper = TestHelperBase<testing::TestWithParam<T>>;
 
-}  // namespace glsl
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::glsl
 
 #endif  // SRC_TINT_WRITER_GLSL_TEST_HELPER_H_