add slim check for function macros

Author: Emmankoko

compiler/src/dmd/cparse.d

@@ -5729,6 +5729,9 @@ final class CParser(AST) : Parser!AST
                             }
 
                             nextToken();
+                            if (token.value == TOK.leftParenthesis) // in case we are evaluating a func
+                                goto caseFunctionLike;
+
                             if (token.value != TOK.endOfFile)
                             {
                                 ++p;