diff --git a/src/tint/writer/spirv/binary_writer.cc b/src/tint/writer/spirv/binary_writer.cc
index 28fcc752db..aa32f38e0e 100644
--- a/src/tint/writer/spirv/binary_writer.cc
+++ b/src/tint/writer/spirv/binary_writer.cc
@@ -16,9 +16,7 @@
 
 #include <cstring>
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 const uint32_t kGeneratorId = 23u << 16;
@@ -72,6 +70,4 @@ void BinaryWriter::process_op(const Operand& op) {
   }
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/binary_writer.h b/src/tint/writer/spirv/binary_writer.h
index f852a3585e..89789fd955 100644
--- a/src/tint/writer/spirv/binary_writer.h
+++ b/src/tint/writer/spirv/binary_writer.h
@@ -19,9 +19,7 @@
 
 #include "src/tint/writer/spirv/builder.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// Writer to convert from builder to SPIR-V binary
 class BinaryWriter {
@@ -54,8 +52,6 @@ class BinaryWriter {
   std::vector<uint32_t> out_;
 };
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_BINARY_WRITER_H_
diff --git a/src/tint/writer/spirv/binary_writer_test.cc b/src/tint/writer/spirv/binary_writer_test.cc
index 86420e0e49..5d6b8b8f55 100644
--- a/src/tint/writer/spirv/binary_writer_test.cc
+++ b/src/tint/writer/spirv/binary_writer_test.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BinaryWriterTest = TestHelper;
@@ -125,6 +123,4 @@ TEST_F(BinaryWriterTest, TestInstructionWriter) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder.cc b/src/tint/writer/spirv/builder.cc
index 5de6e46ce9..30a5f41b07 100644
--- a/src/tint/writer/spirv/builder.cc
+++ b/src/tint/writer/spirv/builder.cc
@@ -62,9 +62,7 @@
 #include "src/tint/writer/append_vector.h"
 #include "src/tint/writer/generate_external_texture_bindings.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuiltinType = sem::BuiltinType;
@@ -4380,6 +4378,4 @@ Builder::Backedge& Builder::Backedge::operator=(
     const Builder::Backedge& other) = default;
 Builder::Backedge::~Backedge() = default;
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder.h b/src/tint/writer/spirv/builder.h
index 2a94635c17..297fbaf1f8 100644
--- a/src/tint/writer/spirv/builder.h
+++ b/src/tint/writer/spirv/builder.h
@@ -40,18 +40,16 @@
 #include "src/tint/writer/spirv/function.h"
 #include "src/tint/writer/spirv/scalar_constant.h"
 
-namespace tint {
 
 // Forward declarations
-namespace sem {
+namespace tint::sem {
 class Call;
 class Reference;
 class TypeConstructor;
 class TypeConversion;
-}  // namespace sem
+}  // namespace tint::sem
 
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// The result of sanitizing a program for generation.
 struct SanitizedResult {
@@ -658,8 +656,6 @@ class Builder {
   std::vector<Backedge> backedge_stack_;
 };
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_BUILDER_H_
diff --git a/src/tint/writer/spirv/builder_accessor_expression_test.cc b/src/tint/writer/spirv/builder_accessor_expression_test.cc
index a545613b21..285d2594ee 100644
--- a/src/tint/writer/spirv/builder_accessor_expression_test.cc
+++ b/src/tint/writer/spirv/builder_accessor_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -1042,6 +1040,4 @@ OpReturn
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_assign_test.cc b/src/tint/writer/spirv/builder_assign_test.cc
index 2fd1db25f0..cd64741bc9 100644
--- a/src/tint/writer/spirv/builder_assign_test.cc
+++ b/src/tint/writer/spirv/builder_assign_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -315,6 +313,4 @@ OpStore %9 %10
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_binary_expression_test.cc b/src/tint/writer/spirv/builder_binary_expression_test.cc
index 22007a9e9c..e2768a8d8a 100644
--- a/src/tint/writer/spirv/builder_binary_expression_test.cc
+++ b/src/tint/writer/spirv/builder_binary_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -1244,6 +1242,4 @@ INSTANTIATE_TEST_SUITE_P(  //
 }  // namespace BinaryArithMatrixMatrix
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_bitcast_expression_test.cc b/src/tint/writer/spirv/builder_bitcast_expression_test.cc
index 513712b958..655ed33ae1 100644
--- a/src/tint/writer/spirv/builder_bitcast_expression_test.cc
+++ b/src/tint/writer/spirv/builder_bitcast_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -60,6 +58,4 @@ TEST_F(BuilderTest, Bitcast_DuplicateType) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_block_test.cc b/src/tint/writer/spirv/builder_block_test.cc
index 579d7bcf47..462161b06c 100644
--- a/src/tint/writer/spirv/builder_block_test.cc
+++ b/src/tint/writer/spirv/builder_block_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -61,6 +59,4 @@ OpStore %1 %8
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_builtin_test.cc b/src/tint/writer/spirv/builder_builtin_test.cc
index 67385460b8..0e6ab277ee 100644
--- a/src/tint/writer/spirv/builder_builtin_test.cc
+++ b/src/tint/writer/spirv/builder_builtin_test.cc
@@ -19,9 +19,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuiltinBuilderTest = TestHelper;
@@ -2642,6 +2640,4 @@ OpFunctionEnd
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_builtin_texture_test.cc b/src/tint/writer/spirv/builder_builtin_texture_test.cc
index 67df5ad020..00f8e7658c 100644
--- a/src/tint/writer/spirv/builder_builtin_texture_test.cc
+++ b/src/tint/writer/spirv/builder_builtin_texture_test.cc
@@ -19,9 +19,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 struct expected_texture_overload_spirv {
@@ -3750,6 +3748,4 @@ TEST_P(BuiltinTextureTest, OutsideFunction_IsError) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_call_test.cc b/src/tint/writer/spirv/builder_call_test.cc
index 8761bacd95..77b169f7c4 100644
--- a/src/tint/writer/spirv/builder_call_test.cc
+++ b/src/tint/writer/spirv/builder_call_test.cc
@@ -17,9 +17,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -102,6 +100,4 @@ OpFunctionEnd
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_constructor_expression_test.cc b/src/tint/writer/spirv/builder_constructor_expression_test.cc
index 2615b05867..495f1c4f5e 100644
--- a/src/tint/writer/spirv/builder_constructor_expression_test.cc
+++ b/src/tint/writer/spirv/builder_constructor_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using SpvBuilderConstructorTest = TestHelper;
@@ -1853,6 +1851,4 @@ TEST_F(SpvBuilderConstructorTest,
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_discard_test.cc b/src/tint/writer/spirv/builder_discard_test.cc
index 5a85bff952..baa566f691 100644
--- a/src/tint/writer/spirv/builder_discard_test.cc
+++ b/src/tint/writer/spirv/builder_discard_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -35,6 +33,4 @@ TEST_F(BuilderTest, Discard) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_entry_point_test.cc b/src/tint/writer/spirv/builder_entry_point_test.cc
index a860d655c6..738aa4be1e 100644
--- a/src/tint/writer/spirv/builder_entry_point_test.cc
+++ b/src/tint/writer/spirv/builder_entry_point_test.cc
@@ -29,9 +29,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -317,6 +315,4 @@ TEST_F(BuilderTest, SampleIndex_SampleRateShadingCapability) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_format_conversion_test.cc b/src/tint/writer/spirv/builder_format_conversion_test.cc
index 7ff824f84e..396b5ac167 100644
--- a/src/tint/writer/spirv/builder_format_conversion_test.cc
+++ b/src/tint/writer/spirv/builder_format_conversion_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 struct TestData {
@@ -90,6 +88,4 @@ INSTANTIATE_TEST_SUITE_P(
         TestData{ast::TexelFormat::kRgba32Float, SpvImageFormatRgba32f}));
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_function_attribute_test.cc b/src/tint/writer/spirv/builder_function_attribute_test.cc
index 3ddb7eb89c..8a9e82a2fb 100644
--- a/src/tint/writer/spirv/builder_function_attribute_test.cc
+++ b/src/tint/writer/spirv/builder_function_attribute_test.cc
@@ -17,9 +17,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -267,6 +265,4 @@ OpExecutionMode %11 DepthReplacing
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_function_test.cc b/src/tint/writer/spirv/builder_function_test.cc
index b3185636c9..23dd0c8a42 100644
--- a/src/tint/writer/spirv/builder_function_test.cc
+++ b/src/tint/writer/spirv/builder_function_test.cc
@@ -16,9 +16,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -285,6 +283,4 @@ OpFunctionEnd
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_function_variable_test.cc b/src/tint/writer/spirv/builder_function_variable_test.cc
index fd64ea93ac..6264b27e03 100644
--- a/src/tint/writer/spirv/builder_function_variable_test.cc
+++ b/src/tint/writer/spirv/builder_function_variable_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -194,6 +192,4 @@ TEST_F(BuilderTest, FunctionVar_Const) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_global_variable_test.cc b/src/tint/writer/spirv/builder_global_variable_test.cc
index b7234fd31f..16ae30bff3 100644
--- a/src/tint/writer/spirv/builder_global_variable_test.cc
+++ b/src/tint/writer/spirv/builder_global_variable_test.cc
@@ -17,9 +17,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -660,6 +658,4 @@ TEST_F(BuilderTest, GlobalVar_WorkgroupWithZeroInit) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_ident_expression_test.cc b/src/tint/writer/spirv/builder_ident_expression_test.cc
index dfaf9f6f41..48d35a35bb 100644
--- a/src/tint/writer/spirv/builder_ident_expression_test.cc
+++ b/src/tint/writer/spirv/builder_ident_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -160,6 +158,4 @@ TEST_F(BuilderTest, IdentifierExpression_NoLoadConst) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_if_test.cc b/src/tint/writer/spirv/builder_if_test.cc
index 25ec9e8ac7..661bbd8658 100644
--- a/src/tint/writer/spirv/builder_if_test.cc
+++ b/src/tint/writer/spirv/builder_if_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -668,6 +666,4 @@ OpReturn
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_literal_test.cc b/src/tint/writer/spirv/builder_literal_test.cc
index 1b68523060..49378efe08 100644
--- a/src/tint/writer/spirv/builder_literal_test.cc
+++ b/src/tint/writer/spirv/builder_literal_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 using BuilderTest = TestHelper;
 
@@ -163,6 +161,4 @@ TEST_F(BuilderTest, Literal_F32_Dedup) {
 )");
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_loop_test.cc b/src/tint/writer/spirv/builder_loop_test.cc
index 23a7ec4d10..555c167185 100644
--- a/src/tint/writer/spirv/builder_loop_test.cc
+++ b/src/tint/writer/spirv/builder_loop_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -490,6 +488,4 @@ OpBranchConditional %10 %1 %2
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_return_test.cc b/src/tint/writer/spirv/builder_return_test.cc
index 73f0c1a135..3b0eb4a0fc 100644
--- a/src/tint/writer/spirv/builder_return_test.cc
+++ b/src/tint/writer/spirv/builder_return_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -86,6 +84,4 @@ OpReturnValue %5
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_switch_test.cc b/src/tint/writer/spirv/builder_switch_test.cc
index 4336ccf7ea..8fd79213fb 100644
--- a/src/tint/writer/spirv/builder_switch_test.cc
+++ b/src/tint/writer/spirv/builder_switch_test.cc
@@ -16,9 +16,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -447,6 +445,4 @@ OpFunctionEnd
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_test.cc b/src/tint/writer/spirv/builder_test.cc
index 6a82ce51c0..59938ad56d 100644
--- a/src/tint/writer/spirv/builder_test.cc
+++ b/src/tint/writer/spirv/builder_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -43,6 +41,4 @@ TEST_F(BuilderTest, Capabilities_Dedup) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_type_test.cc b/src/tint/writer/spirv/builder_type_test.cc
index 3a8941c03c..8ab7b9d454 100644
--- a/src/tint/writer/spirv/builder_type_test.cc
+++ b/src/tint/writer/spirv/builder_type_test.cc
@@ -18,9 +18,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest_Type = TestHelper;
@@ -961,6 +959,4 @@ TEST_F(BuilderTest_Type, Dedup_Sampler_And_ComparisonSampler) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/builder_unary_op_expression_test.cc b/src/tint/writer/spirv/builder_unary_op_expression_test.cc
index 901d51affb..ae08c947c9 100644
--- a/src/tint/writer/spirv/builder_unary_op_expression_test.cc
+++ b/src/tint/writer/spirv/builder_unary_op_expression_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/spv_dump.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using BuilderTest = TestHelper;
@@ -117,6 +115,4 @@ TEST_F(BuilderTest, UnaryOp_LoadRequired) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/function.cc b/src/tint/writer/spirv/function.cc
index f8857e9a26..c7dc85588b 100644
--- a/src/tint/writer/spirv/function.cc
+++ b/src/tint/writer/spirv/function.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/spirv/function.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 Function::Function()
     : declaration_(Instruction{spv::Op::OpNop, {}}),
@@ -50,6 +48,4 @@ void Function::iterate(std::function<void(const Instruction&)> cb) const {
   cb(Instruction{spv::Op::OpFunctionEnd, {}});
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/function.h b/src/tint/writer/spirv/function.h
index 2f856d278b..de6f8a4876 100644
--- a/src/tint/writer/spirv/function.h
+++ b/src/tint/writer/spirv/function.h
@@ -19,9 +19,7 @@
 
 #include "src/tint/writer/spirv/instruction.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// A SPIR-V function
 class Function {
@@ -94,8 +92,6 @@ class Function {
   InstructionList instructions_;
 };
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_FUNCTION_H_
diff --git a/src/tint/writer/spirv/generator.cc b/src/tint/writer/spirv/generator.cc
index f27514aa0e..7d299355ff 100644
--- a/src/tint/writer/spirv/generator.cc
+++ b/src/tint/writer/spirv/generator.cc
@@ -16,9 +16,7 @@
 
 #include "src/tint/writer/spirv/binary_writer.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 Result::Result() = default;
 Result::~Result() = default;
@@ -62,6 +60,4 @@ Result Generate(const Program* program, const Options& options) {
   return result;
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/generator.h b/src/tint/writer/spirv/generator.h
index 191e43abfa..3d6f43215d 100644
--- a/src/tint/writer/spirv/generator.h
+++ b/src/tint/writer/spirv/generator.h
@@ -21,17 +21,16 @@
 
 #include "src/tint/writer/writer.h"
 
-namespace tint {
-
 // Forward declarations
+namespace tint {
 class Program;
-
-namespace writer {
-namespace spirv {
-
-/// Forward declarations
+namespace writer::spirv {
 class Builder;
 class BinaryWriter;
+}  // namespace writer::spirv
+}  // namespace tint
+
+namespace tint::writer::spirv {
 
 /// Configuration options used for generating SPIR-V.
 struct Options {
@@ -79,8 +78,6 @@ struct Result {
 /// @returns the resulting SPIR-V and supplementary information
 Result Generate(const Program* program, const Options& options);
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_GENERATOR_H_
diff --git a/src/tint/writer/spirv/instruction.cc b/src/tint/writer/spirv/instruction.cc
index 29f8bcaaab..4be648b37a 100644
--- a/src/tint/writer/spirv/instruction.cc
+++ b/src/tint/writer/spirv/instruction.cc
@@ -16,9 +16,7 @@
 
 #include <utility>
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 Instruction::Instruction(spv::Op op, OperandList operands)
     : op_(op), operands_(std::move(operands)) {}
@@ -35,6 +33,4 @@ uint32_t Instruction::word_length() const {
   return size;
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/instruction.h b/src/tint/writer/spirv/instruction.h
index e2892b19d0..7fd126c6ea 100644
--- a/src/tint/writer/spirv/instruction.h
+++ b/src/tint/writer/spirv/instruction.h
@@ -20,9 +20,7 @@
 #include "spirv/unified1/spirv.hpp11"
 #include "src/tint/writer/spirv/operand.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// A single SPIR-V instruction
 class Instruction {
@@ -52,8 +50,6 @@ class Instruction {
 /// A list of instructions
 using InstructionList = std::vector<Instruction>;
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_INSTRUCTION_H_
diff --git a/src/tint/writer/spirv/instruction_test.cc b/src/tint/writer/spirv/instruction_test.cc
index 46e8d25085..2c919f05b1 100644
--- a/src/tint/writer/spirv/instruction_test.cc
+++ b/src/tint/writer/spirv/instruction_test.cc
@@ -16,9 +16,7 @@
 
 #include "gtest/gtest.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using InstructionTest = testing::Test;
@@ -47,6 +45,4 @@ TEST_F(InstructionTest, Length) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/operand.cc b/src/tint/writer/spirv/operand.cc
index ef85b3a3b6..7d2724997c 100644
--- a/src/tint/writer/spirv/operand.cc
+++ b/src/tint/writer/spirv/operand.cc
@@ -14,9 +14,7 @@
 
 #include "src/tint/writer/spirv/operand.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 // static
 Operand Operand::Float(float val) {
@@ -60,6 +58,4 @@ uint32_t Operand::length() const {
   return val;
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/operand.h b/src/tint/writer/spirv/operand.h
index 9af06ced15..46a5deb55b 100644
--- a/src/tint/writer/spirv/operand.h
+++ b/src/tint/writer/spirv/operand.h
@@ -18,9 +18,7 @@
 #include <string>
 #include <vector>
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// A single SPIR-V instruction operand
 class Operand {
@@ -92,8 +90,6 @@ class Operand {
 /// A list of operands
 using OperandList = std::vector<Operand>;
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_OPERAND_H_
diff --git a/src/tint/writer/spirv/operand_test.cc b/src/tint/writer/spirv/operand_test.cc
index 36b4306dba..9a688e9056 100644
--- a/src/tint/writer/spirv/operand_test.cc
+++ b/src/tint/writer/spirv/operand_test.cc
@@ -16,9 +16,7 @@
 
 #include "gtest/gtest.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using OperandTest = testing::Test;
@@ -62,6 +60,4 @@ TEST_F(OperandTest, Length_String_Empty) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/scalar_constant.h b/src/tint/writer/spirv/scalar_constant.h
index 100ebcc6d2..abb1a0dcf6 100644
--- a/src/tint/writer/spirv/scalar_constant.h
+++ b/src/tint/writer/spirv/scalar_constant.h
@@ -22,15 +22,12 @@
 
 #include "src/tint/utils/hash.h"
 
-namespace tint {
-
 // Forward declarations
-namespace sem {
+namespace tint::sem {
 class Call;
-}  // namespace sem
+}  // namespace tint::sem
 
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// ScalarConstant represents a scalar constant value
 struct ScalarConstant {
@@ -127,9 +124,7 @@ struct ScalarConstant {
   uint32_t constant_id = 0;
 };
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 namespace std {
 
diff --git a/src/tint/writer/spirv/scalar_constant_test.cc b/src/tint/writer/spirv/scalar_constant_test.cc
index 3113e553b8..253f05b86f 100644
--- a/src/tint/writer/spirv/scalar_constant_test.cc
+++ b/src/tint/writer/spirv/scalar_constant_test.cc
@@ -15,9 +15,7 @@
 #include "src/tint/writer/spirv/scalar_constant.h"
 #include "src/tint/writer/spirv/test_helper.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 using SpirvScalarConstantTest = TestHelper;
@@ -55,6 +53,4 @@ TEST_F(SpirvScalarConstantTest, U32) {
 }
 
 }  // namespace
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/spv_dump.cc b/src/tint/writer/spirv/spv_dump.cc
index 463b1fedb5..21dc1a54ab 100644
--- a/src/tint/writer/spirv/spv_dump.cc
+++ b/src/tint/writer/spirv/spv_dump.cc
@@ -17,9 +17,7 @@
 #include "spirv-tools/libspirv.hpp"
 #include "src/tint/writer/spirv/binary_writer.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 namespace {
 
 std::string Disassemble(const std::vector<uint32_t>& data) {
@@ -84,6 +82,4 @@ std::string DumpInstructions(const InstructionList& insts) {
   return Disassemble(writer.result());
 }
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
diff --git a/src/tint/writer/spirv/spv_dump.h b/src/tint/writer/spirv/spv_dump.h
index 6d9170ca13..2147d1d4f7 100644
--- a/src/tint/writer/spirv/spv_dump.h
+++ b/src/tint/writer/spirv/spv_dump.h
@@ -20,9 +20,7 @@
 
 #include "src/tint/writer/spirv/builder.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// Dumps the given builder to a SPIR-V disassembly string
 /// @param builder the builder to convert
@@ -39,8 +37,6 @@ std::string DumpInstruction(const Instruction& inst);
 /// @returns the instruction as a SPIR-V disassembly string
 std::string DumpInstructions(const InstructionList& insts);
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_SPV_DUMP_H_
diff --git a/src/tint/writer/spirv/test_helper.h b/src/tint/writer/spirv/test_helper.h
index 6e233f0f95..e80c331685 100644
--- a/src/tint/writer/spirv/test_helper.h
+++ b/src/tint/writer/spirv/test_helper.h
@@ -23,9 +23,7 @@
 #include "spirv-tools/libspirv.hpp"
 #include "src/tint/writer/spirv/binary_writer.h"
 
-namespace tint {
-namespace writer {
-namespace spirv {
+namespace tint::writer::spirv {
 
 /// Helper class for testing
 template <typename BASE>
@@ -132,8 +130,6 @@ using TestHelper = TestHelperBase<testing::Test>;
 template <typename T>
 using TestParamHelper = TestHelperBase<testing::TestWithParam<T>>;
 
-}  // namespace spirv
-}  // namespace writer
-}  // namespace tint
+}  // namespace tint::writer::spirv
 
 #endif  // SRC_TINT_WRITER_SPIRV_TEST_HELPER_H_