Merge pull request #18804 from agocke/fix-build

Fix build due to bad merge with CreateCompilationWithMscorlib

src/Compilers/CSharp/Test/Syntax/Parsing/ParserErrorMessageTests.cs

@@ -2173,7 +2173,7 @@ public static void Main()
 }
 ";
 
-            CreateCompilationWithMscorlib(text).VerifyDiagnostics(
+            CreateStandardCompilation(text).VerifyDiagnostics(
                 // (7,26): error CS8124: Tuple must contain at least two elements.
                 //             var e = new ();
                 Diagnostic(ErrorCode.ERR_TupleTooFewElements, ")").WithLocation(7, 26),
@@ -2239,7 +2239,7 @@ public static void Main()
     }
 }
 ";
-            CreateCompilationWithMscorlib(text, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.CSharp6)).VerifyDiagnostics(
+            CreateStandardCompilation(text, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.CSharp6)).VerifyDiagnostics(
                 // (7,25): error CS8059: Feature 'tuples' is not available in C# 6.  Please use language version 7 or greater.
                 //             var e = new ();
                 Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion6, "()").WithArguments("tuples", "7").WithLocation(7, 25),
@@ -2271,7 +2271,7 @@ public static void Main()
     }
 }
 ";
-            CreateCompilationWithMscorlib(text, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.CSharp7)).VerifyDiagnostics(
+            CreateStandardCompilation(text, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.CSharp7)).VerifyDiagnostics(
                 // (7,26): error CS8124: Tuple must contain at least two elements.
                 //             var e = new ();
                 Diagnostic(ErrorCode.ERR_TupleTooFewElements, ")"),