Adjust tests from comments

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

@@ -1071,5 +1071,83 @@ .maxstack  2
   IL_001b:  ret
 }");
         }
+
+        [Fact]
+        public void DataClassAndStruct()
+        {
+            var src = @"
+data class C1 { }
+data class C2(int X, int Y);
+data struct S1 { }
+data struct S2(int X, int Y);";
+            var comp = CreateCompilation(src);
+            comp.VerifyDiagnostics(
+                // error CS8805: Program using top-level statements must be an executable.
+                Diagnostic(ErrorCode.ERR_SimpleProgramNotAnExecutable).WithLocation(1, 1),
+                // (2,1): error CS0116: A namespace cannot directly contain members such as fields or methods
+                // data class C1 { }
+                Diagnostic(ErrorCode.ERR_NamespaceUnexpected, "data").WithLocation(2, 1),
+                // (3,1): error CS0116: A namespace cannot directly contain members such as fields or methods
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_NamespaceUnexpected, "data").WithLocation(3, 1),
+                // (3,14): error CS1514: { expected
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_LbraceExpected, "(").WithLocation(3, 14),
+                // (3,14): error CS1513: } expected
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_RbraceExpected, "(").WithLocation(3, 14),
+                // (3,14): error CS8803: Top-level statements must precede namespace and type declarations.
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_TopLevelStatementAfterNamespaceOrType, "(int X, int Y);").WithLocation(3, 14),
+                // (3,14): error CS0201: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_IllegalStatement, "(int X, int Y)").WithLocation(3, 14),
+                // (3,15): error CS8185: A declaration is not allowed in this context.
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_DeclarationExpressionNotPermitted, "int X").WithLocation(3, 15),
+                // (3,15): error CS0165: Use of unassigned local variable 'X'
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_UseDefViolation, "int X").WithArguments("X").WithLocation(3, 15),
+                // (3,22): error CS8185: A declaration is not allowed in this context.
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_DeclarationExpressionNotPermitted, "int Y").WithLocation(3, 22),
+                // (3,22): error CS0165: Use of unassigned local variable 'Y'
+                // data class C2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_UseDefViolation, "int Y").WithArguments("Y").WithLocation(3, 22),
+                // (4,1): error CS0116: A namespace cannot directly contain members such as fields or methods
+                // data struct S1 { }
+                Diagnostic(ErrorCode.ERR_NamespaceUnexpected, "data").WithLocation(4, 1),
+                // (5,1): error CS0116: A namespace cannot directly contain members such as fields or methods
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_NamespaceUnexpected, "data").WithLocation(5, 1),
+                // (5,15): error CS1514: { expected
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_LbraceExpected, "(").WithLocation(5, 15),
+                // (5,15): error CS1513: } expected
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_RbraceExpected, "(").WithLocation(5, 15),
+                // (5,15): error CS0201: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_IllegalStatement, "(int X, int Y)").WithLocation(5, 15),
+                // (5,16): error CS8185: A declaration is not allowed in this context.
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_DeclarationExpressionNotPermitted, "int X").WithLocation(5, 16),
+                // (5,16): error CS0165: Use of unassigned local variable 'X'
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_UseDefViolation, "int X").WithArguments("X").WithLocation(5, 16),
+                // (5,20): error CS0128: A local variable or function named 'X' is already defined in this scope
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_LocalDuplicate, "X").WithArguments("X").WithLocation(5, 20),
+                // (5,23): error CS8185: A declaration is not allowed in this context.
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_DeclarationExpressionNotPermitted, "int Y").WithLocation(5, 23),
+                // (5,23): error CS0165: Use of unassigned local variable 'Y'
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_UseDefViolation, "int Y").WithArguments("Y").WithLocation(5, 23),
+                // (5,27): error CS0128: A local variable or function named 'Y' is already defined in this scope
+                // data struct S2(int X, int Y);
+                Diagnostic(ErrorCode.ERR_LocalDuplicate, "Y").WithArguments("Y").WithLocation(5, 27)
+            );
+        }
     }
 }

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

@@ -1314,7 +1314,7 @@ public void WithParsing19()
         }
 
         [Fact]
-        public void InvalidBase()
+        public void BadParameterListAndBaseListOnClass()
         {
             var text = @$"
 class C(int X, int Y)