Tests passing

src/Compilers/CSharp/Test/Symbol/Symbols/Metadata/PE/LoadingAttributes.cs

@@ -1504,7 +1504,7 @@ .maxstack  8
 } // end of class MyAttribute
 ";
 
-            var c = CreateStandardCompilationWithCustomILSource(@"
+            var c = CreateCompilationWithCustomILSource(@"
 [MyAttribute(typeof(MyAttribute))]
 public class Test
 {

src/Compilers/CSharp/Test/Symbol/Symbols/Metadata/PE/NoPiaInstantiationOfGenericClassAndStruct.cs

@@ -473,7 +473,7 @@ public void NoPiaIllegalGenericInstantiationSymbolForAssemblyRefsWithClassThatIn
         {
             //Test class that inherits Generic(Of NoPIAType)
 
-            var localConsumer = CreateStandardCompilation(assemblyName: "Dummy", source: (string)null,
+            var localConsumer = CreateCompilationWithMscorlib40(assemblyName: "Dummy", source: (string[])null,
                 references: new[]
                 {
                     TestReferences.SymbolsTests.NoPia.NoPIAGenericsAsm1,
@@ -552,7 +552,7 @@ public List<FooStruct> Method4()
             var localType = CreateStandardCompilation(assemblyName: "Dummy", source: localTypeSource,
                 references: new[] { TestReferences.SymbolsTests.NoPia.GeneralPia.WithEmbedInteropTypes(true) });
 
-            var localConsumer = CreateStandardCompilation(assemblyName: "Dummy", source: (string)null,
+            var localConsumer = CreateStandardCompilation(assemblyName: "Dummy", source: (string[])null,
                 references: new MetadataReference[]
                 {
                     TestReferences.SymbolsTests.NoPia.GeneralPiaCopy,

src/Compilers/CSharp/Test/Symbol/Symbols/Retargeting/NoPia.cs

@@ -344,10 +344,10 @@ public void HideLocalTypeDefinitions()
         [ConditionalFact(typeof(ClrOnly), typeof(DesktopOnly))]
         public void LocalTypeSubstitution1_1()
         {
-            var LocalTypes1 = CreateStandardCompilation(s_sourceLocalTypes1_IL, options: TestOptions.ReleaseDll, assemblyName: "LocalTypes1");
+            var LocalTypes1 = CreateCompilationWithMscorlib40(s_sourceLocalTypes1_IL, options: TestOptions.ReleaseDll, assemblyName: "LocalTypes1");
             CompileAndVerify(LocalTypes1);
 
-            var LocalTypes2 = CreateStandardCompilation(s_sourceLocalTypes2_IL, options: TestOptions.ReleaseDll, assemblyName: "LocalTypes2");
+            var LocalTypes2 = CreateCompilationWithMscorlib40(s_sourceLocalTypes2_IL, options: TestOptions.ReleaseDll, assemblyName: "LocalTypes2");
             CompileAndVerify(LocalTypes2);
 
             var assemblies1 = MetadataTestHelpers.GetSymbolsForReferences(new CSharpCompilation[] { LocalTypes1, LocalTypes2 },

src/Compilers/CSharp/Test/Symbol/Symbols/Source/CustomModifierCopyTests.cs

@@ -730,7 +730,7 @@ static void Main()
     }
 }
 ";
-            var comp = CreateStandardCompilationWithCustomILSource(source, il,
+            var comp = CreateCompilationWithCustomILSource(source, il,
                 options: TestOptions.ReleaseExe.WithMetadataImportOptions(MetadataImportOptions.All),
                 references: new[] { CSharpRef });
 

src/Compilers/Test/Utilities/CSharp/CSharpTestBase.cs

@@ -329,7 +329,7 @@ public static SyntaxTree ParseWithRoundTripCheck(string text, CSharpParseOptions
             string ilSource,
             IEnumerable<MetadataReference> references = null,
             CSharpCompilationOptions options = null,
-            bool appendDefaultHeader = true) => CreateCompilationWithCustomILSource(source, ilSource, TargetFramework.NetStandard20, references, options, appendDefaultHeader);
+            bool appendDefaultHeader = true) => CreateCompilationWithCustomILSource(source, ilSource, TargetFramework.Standard, references, options, appendDefaultHeader);
 
         public static CSharpCompilation CreateCompilationWithCustomILSource(
             string source,
@@ -359,11 +359,11 @@ public static SyntaxTree ParseWithRoundTripCheck(string text, CSharpParseOptions
             string assemblyName = "") => CreateCompilation(Parse(source, sourceFileName, parseOptions), TargetFramework.Net40, references, options, assemblyName);
 
         public static CSharpCompilation CreateCompilationWithMscorlib40(
-            string[] sources,
+            string[] source,
             IEnumerable<MetadataReference> references = null,
             CSharpCompilationOptions options = null,
             CSharpParseOptions parseOptions = null,
-            string assemblyName = "") => CreateCompilation(sources, TargetFramework.Net40, references, options, parseOptions, assemblyName);
+            string assemblyName = "") => CreateCompilation(source, TargetFramework.Net40, references, options, parseOptions, assemblyName);
 
         public static CSharpCompilation CreateCompilationWithMscorlib45(
             IEnumerable<SyntaxTree> source,