diff --git a/src/Compilers/CSharp/Test/Emit/Attributes/AttributeTests_RefReadOnly.cs b/src/Compilers/CSharp/Test/Emit/Attributes/AttributeTests_RefReadOnly.cs
index 5f7239f1d3e83cc067ee4e48f9bf4c2872549772..274250abcad71be29b51f3bf56d5b03c71588a93 100644
--- a/src/Compilers/CSharp/Test/Emit/Attributes/AttributeTests_RefReadOnly.cs
+++ b/src/Compilers/CSharp/Test/Emit/Attributes/AttributeTests_RefReadOnly.cs
@@ -584,7 +584,7 @@ public void M()
             var options = TestOptions.DebugDll.WithMetadataImportOptions(MetadataImportOptions.All);
             CompileAndVerify(text, verify: false, options: options, symbolValidator: module =>
             {
-                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner0_0");
+                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner|0_0");
                 Assert.Equal(RefKind.RefReadOnly, method.RefKind);
                 Assert.True(method.ReturnsByRefReadonly);
 
@@ -612,7 +612,7 @@ public void M()
             var options = TestOptions.DebugDll.WithMetadataImportOptions(MetadataImportOptions.All);
             CompileAndVerify(text, options: options, symbolValidator: module =>
             {
-                var parameter = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner0_0").GetParameters().Single();
+                var parameter = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner|0_0").GetParameters().Single();
                 Assert.Equal(RefKind.RefReadOnly, parameter.RefKind);
 
                 AssertReferencedIsReadOnlyAttribute(Accessibility.Internal, parameter.GetAttributes(), module.ContainingAssembly.Name);
@@ -639,7 +639,7 @@ public void M()
             var options = TestOptions.DebugDll.WithMetadataImportOptions(MetadataImportOptions.All);
             CompileAndVerify(text, verify: false, options: options, symbolValidator: module =>
             {
-                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner1_0");
+                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner|1_0");
                 Assert.Equal(RefKind.RefReadOnly, method.RefKind);
                 Assert.True(method.ReturnsByRefReadonly);
 
@@ -673,7 +673,7 @@ public void M()
             var options = TestOptions.DebugDll.WithMetadataImportOptions(MetadataImportOptions.All);
             CompileAndVerify(codeB, verify: false, additionalRefs: new[] { referenceA }, options: options, symbolValidator: module =>
             {
-                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner0_0");
+                var method = module.ContainingAssembly.GetTypeByMetadataName("Test").GetMethod("<M>g__Inner|0_0");
                 Assert.Equal(RefKind.RefReadOnly, method.RefKind);
                 Assert.True(method.ReturnsByRefReadonly);
 
diff --git a/src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenInParametersTests.cs b/src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenInParametersTests.cs
index 59f92dfe04c9b8b9287a0ba79901e7be6d44ed22..dc9ef6180cafe6f752c92d0eec7ec209e37e8873 100644
--- a/src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenInParametersTests.cs
+++ b/src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenInParametersTests.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Open Technologies, Inc.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft Open Technologies, Inc.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
 using System;
 using System.Collections.Generic;
@@ -639,7 +639,7 @@ class Program
 
             var comp = CompileAndVerify(text, new[] { ValueTupleRef, SystemRuntimeFacadeRef }, parseOptions: TestOptions.Regular, verify: false);
 
-            comp.VerifyIL("Program.<M>g__M10_0(in int, in (int Alice, int Bob))", @"
+            comp.VerifyIL("Program.<M>g__M1|0_0(in int, in (int Alice, int Bob))", @"
 {
   // Code size       12 (0xc)
   .maxstack  1