diff --git a/src/dawn/tests/end2end/ShaderTests.cpp b/src/dawn/tests/end2end/ShaderTests.cpp
index fc94c48..683e361 100644
--- a/src/dawn/tests/end2end/ShaderTests.cpp
+++ b/src/dawn/tests/end2end/ShaderTests.cpp
@@ -1462,6 +1462,48 @@
     EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8(255, 255, 255, 255), renderPass.color, 0, 0);
 }
 
+// Test that identifiers containing double underscores are renamed in the GLSL backend.
+TEST_P(ShaderTests, DoubleUnderscore) {
+    wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
+@vertex
+fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
+  const pos = array(
+      vec2( 1.0, -1.0),
+      vec2(-1.0, -1.0),
+      vec2( 0.0,  1.0),
+  );
+  return vec4(pos[VertexIndex], 0.0, 1.0);
+})");
+
+    wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
+diagnostic(off, derivative_uniformity);
+
+@fragment
+fn main() -> @location(0) vec4f {
+  let re__sult = vec4f(1.0);
+  return re__sult;
+})");
+
+    utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(device, 1, 1);
+
+    utils::ComboRenderPipelineDescriptor descriptor;
+    descriptor.vertex.module = vsModule;
+    descriptor.cFragment.module = fsModule;
+    descriptor.primitive.topology = wgpu::PrimitiveTopology::TriangleList;
+    descriptor.cTargets[0].format = renderPass.colorFormat;
+    wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&descriptor);
+
+    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
+    wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
+    pass.SetPipeline(pipeline);
+    pass.Draw(3);
+    pass.End();
+    wgpu::CommandBuffer commands = encoder.Finish();
+    queue.Submit(1, &commands);
+
+    EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8(255, 255, 255, 255), renderPass.color, 0, 0);
+}
+
 DAWN_INSTANTIATE_TEST(ShaderTests,
                       D3D11Backend(),
                       D3D12Backend(),
diff --git a/src/tint/ast/transform/renamer.cc b/src/tint/ast/transform/renamer.cc
index b7c03a1..ff669f7 100644
--- a/src/tint/ast/transform/renamer.cc
+++ b/src/tint/ast/transform/renamer.cc
@@ -1350,7 +1350,7 @@
                                           kReservedKeywordsGLSL +
                                               sizeof(kReservedKeywordsGLSL) / sizeof(const char*),
                                           name) ||
-                       name.compare(0, 3, "gl_") == 0;
+                       name.compare(0, 3, "gl_") == 0 || name.find("__") != std::string::npos;
             case Target::kHlslKeywords:
                 return std::binary_search(
                     kReservedKeywordsHLSL,
diff --git a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
index 9e34bab..873c746 100644
--- a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
@@ -15,7 +15,7 @@
   int arg_0;
 };
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -25,15 +25,15 @@
 } sb_rw;
 
 void atomicCompareExchangeWeak_1bd40a() {
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, 1, 1);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_19 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_19, (x_19 == 1));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_19, (x_19 == 1));
+  res = tint_symbol_2;
   return;
 }
 
@@ -66,7 +66,7 @@
   int arg_0;
 };
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -76,15 +76,15 @@
 } sb_rw;
 
 void atomicCompareExchangeWeak_1bd40a() {
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, 1, 1);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_19 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_19, (x_19 == 1));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_19, (x_19 == 1));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
index cb7126a..36812c3 100644
--- a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
@@ -15,7 +15,7 @@
   uint arg_0;
 };
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -25,15 +25,15 @@
 } sb_rw;
 
 void atomicCompareExchangeWeak_63d8e6() {
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, 1u, 1u);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1u;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_17 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_17, (x_17 == 1u));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_17, (x_17 == 1u));
+  res = tint_symbol_2;
   return;
 }
 
@@ -66,7 +66,7 @@
   uint arg_0;
 };
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -76,15 +76,15 @@
 } sb_rw;
 
 void atomicCompareExchangeWeak_63d8e6() {
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, 1u, 1u);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1u;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_17 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_17, (x_17 == 1u));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_17, (x_17 == 1u));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
index e84462a..6e8440d 100644
--- a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
@@ -6,7 +6,7 @@
 };
 
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -14,15 +14,15 @@
 uint local_invocation_index_1 = 0u;
 shared int arg_0;
 void atomicCompareExchangeWeak_e88938() {
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(arg_0, 1, 1);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_18 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_18, (x_18 == 1));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_18, (x_18 == 1));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
index b8db0ed..b127c4a 100644
--- a/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/literal/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
@@ -6,7 +6,7 @@
 };
 
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -14,15 +14,15 @@
 uint local_invocation_index_1 = 0u;
 shared uint arg_0;
 void atomicCompareExchangeWeak_83580d() {
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(arg_0, 1u, 1u);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == 1u;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_17 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_17, (x_17 == 1u));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_17, (x_17 == 1u));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
index dffc402..0ae1686 100644
--- a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_i32.spvasm.expected.glsl
@@ -15,7 +15,7 @@
   int arg_0;
 };
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -27,7 +27,7 @@
 void atomicCompareExchangeWeak_1bd40a() {
   int arg_1 = 0;
   int arg_2 = 0;
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   arg_1 = 1;
   arg_2 = 1;
   int x_23 = arg_2;
@@ -35,11 +35,11 @@
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, x_24, x_23);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_24;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_25 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_25, (x_25 == x_23));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_25, (x_25 == x_23));
+  res = tint_symbol_2;
   return;
 }
 
@@ -72,7 +72,7 @@
   int arg_0;
 };
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -84,7 +84,7 @@
 void atomicCompareExchangeWeak_1bd40a() {
   int arg_1 = 0;
   int arg_2 = 0;
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   arg_1 = 1;
   arg_2 = 1;
   int x_23 = arg_2;
@@ -92,11 +92,11 @@
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, x_24, x_23);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_24;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_25 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_25, (x_25 == x_23));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_25, (x_25 == x_23));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
index 7c0b63f..a52bb8e 100644
--- a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/storage_u32.spvasm.expected.glsl
@@ -15,7 +15,7 @@
   uint arg_0;
 };
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -27,7 +27,7 @@
 void atomicCompareExchangeWeak_63d8e6() {
   uint arg_1 = 0u;
   uint arg_2 = 0u;
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   arg_1 = 1u;
   arg_2 = 1u;
   uint x_21 = arg_2;
@@ -35,11 +35,11 @@
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, x_22, x_21);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_22;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_23 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_23, (x_23 == x_21));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_23, (x_23 == x_21));
+  res = tint_symbol_2;
   return;
 }
 
@@ -72,7 +72,7 @@
   uint arg_0;
 };
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -84,7 +84,7 @@
 void atomicCompareExchangeWeak_63d8e6() {
   uint arg_1 = 0u;
   uint arg_2 = 0u;
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   arg_1 = 1u;
   arg_2 = 1u;
   uint x_21 = arg_2;
@@ -92,11 +92,11 @@
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(sb_rw.inner.arg_0, x_22, x_21);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_22;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_23 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_23, (x_23 == x_21));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_23, (x_23 == x_21));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
index c93cea2..18b479f 100644
--- a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_i32.spvasm.expected.glsl
@@ -6,7 +6,7 @@
 };
 
 
-struct x__atomic_compare_exchange_resulti32 {
+struct tint_symbol {
   int old_value;
   bool exchanged;
 };
@@ -16,7 +16,7 @@
 void atomicCompareExchangeWeak_e88938() {
   int arg_1 = 0;
   int arg_2 = 0;
-  x__atomic_compare_exchange_resulti32 res = x__atomic_compare_exchange_resulti32(0, false);
+  tint_symbol res = tint_symbol(0, false);
   arg_1 = 1;
   arg_2 = 1;
   int x_22 = arg_2;
@@ -24,11 +24,11 @@
   atomic_compare_exchange_result_i32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(arg_0, x_23, x_22);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_23;
-  atomic_compare_exchange_result_i32 tint_symbol = atomic_compare_result;
-  int old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_i32 tint_symbol_1 = atomic_compare_result;
+  int old_value_1 = tint_symbol_1.old_value;
   int x_24 = old_value_1;
-  x__atomic_compare_exchange_resulti32 tint_symbol_1 = x__atomic_compare_exchange_resulti32(x_24, (x_24 == x_22));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_24, (x_24 == x_22));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
index 920a16e..51e6c91 100644
--- a/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
+++ b/test/tint/builtins/atomics/from_gen/var/atomicCompareExchangeWeak/workgroup_u32.spvasm.expected.glsl
@@ -6,7 +6,7 @@
 };
 
 
-struct x__atomic_compare_exchange_resultu32 {
+struct tint_symbol {
   uint old_value;
   bool exchanged;
 };
@@ -16,7 +16,7 @@
 void atomicCompareExchangeWeak_83580d() {
   uint arg_1 = 0u;
   uint arg_2 = 0u;
-  x__atomic_compare_exchange_resultu32 res = x__atomic_compare_exchange_resultu32(0u, false);
+  tint_symbol res = tint_symbol(0u, false);
   arg_1 = 1u;
   arg_2 = 1u;
   uint x_21 = arg_2;
@@ -24,11 +24,11 @@
   atomic_compare_exchange_result_u32 atomic_compare_result;
   atomic_compare_result.old_value = atomicCompSwap(arg_0, x_22, x_21);
   atomic_compare_result.exchanged = atomic_compare_result.old_value == x_22;
-  atomic_compare_exchange_result_u32 tint_symbol = atomic_compare_result;
-  uint old_value_1 = tint_symbol.old_value;
+  atomic_compare_exchange_result_u32 tint_symbol_1 = atomic_compare_result;
+  uint old_value_1 = tint_symbol_1.old_value;
   uint x_23 = old_value_1;
-  x__atomic_compare_exchange_resultu32 tint_symbol_1 = x__atomic_compare_exchange_resultu32(x_23, (x_23 == x_21));
-  res = tint_symbol_1;
+  tint_symbol tint_symbol_2 = tint_symbol(x_23, (x_23 == x_21));
+  res = tint_symbol_2;
   return;
 }
 
diff --git a/test/tint/identifiers/underscore/double/fn.wgsl.expected.glsl b/test/tint/identifiers/underscore/double/fn.wgsl.expected.glsl
index 8e59b08..03def72 100644
--- a/test/tint/identifiers/underscore/double/fn.wgsl.expected.glsl
+++ b/test/tint/identifiers/underscore/double/fn.wgsl.expected.glsl
@@ -7,14 +7,14 @@
 void a() {
 }
 
-void a__() {
+void tint_symbol() {
 }
 
 void b() {
   a();
 }
 
-void b__() {
-  a__();
+void tint_symbol_1() {
+  tint_symbol();
 }
 
diff --git a/test/tint/identifiers/underscore/double/let.wgsl.expected.glsl b/test/tint/identifiers/underscore/double/let.wgsl.expected.glsl
index f274d04..638acd9 100644
--- a/test/tint/identifiers/underscore/double/let.wgsl.expected.glsl
+++ b/test/tint/identifiers/underscore/double/let.wgsl.expected.glsl
@@ -6,8 +6,8 @@
 }
 void f() {
   int a = 1;
-  int a__ = a;
+  int tint_symbol = a;
   int b = a;
-  int b__ = a__;
+  int tint_symbol_1 = tint_symbol;
 }
 
diff --git a/test/tint/identifiers/underscore/double/parameter.wgsl.expected.glsl b/test/tint/identifiers/underscore/double/parameter.wgsl.expected.glsl
index 1c7262a..8e82935 100644
--- a/test/tint/identifiers/underscore/double/parameter.wgsl.expected.glsl
+++ b/test/tint/identifiers/underscore/double/parameter.wgsl.expected.glsl
@@ -4,7 +4,7 @@
 void unused_entry_point() {
   return;
 }
-void f(int a__) {
-  int b = a__;
+void f(int tint_symbol) {
+  int b = tint_symbol;
 }
 
diff --git a/test/tint/identifiers/underscore/double/struct.wgsl.expected.glsl b/test/tint/identifiers/underscore/double/struct.wgsl.expected.glsl
index 9eb009e..a6ac4ff 100644
--- a/test/tint/identifiers/underscore/double/struct.wgsl.expected.glsl
+++ b/test/tint/identifiers/underscore/double/struct.wgsl.expected.glsl
@@ -8,12 +8,12 @@
   int b;
 };
 
-struct a__ {
-  int b__;
+struct tint_symbol {
+  int tint_symbol_1;
 };
 
 void f() {
-  a__ c = a__(0);
-  int d = c.b__;
+  tint_symbol c = tint_symbol(0);
+  int d = c.tint_symbol_1;
 }
 
diff --git a/test/tint/identifiers/underscore/double/var.wgsl.expected.glsl b/test/tint/identifiers/underscore/double/var.wgsl.expected.glsl
index f61376a..9addc29 100644
--- a/test/tint/identifiers/underscore/double/var.wgsl.expected.glsl
+++ b/test/tint/identifiers/underscore/double/var.wgsl.expected.glsl
@@ -5,9 +5,9 @@
   return;
 }
 int a = 1;
-int a__ = 2;
+int tint_symbol = 2;
 void f() {
   int b = a;
-  int b__ = a__;
+  int tint_symbol_1 = tint_symbol;
 }