test/Sema/implicit-def.c - third_party/swift-clang - Git at Google

 /* RUN: %clang_cc1 -fsyntax-only %s -std=c89
  * RUN: not %clang_cc1 -fsyntax-only %s -std=c99 -pedantic-errors
  */

 int A() {
   return X();
 }
	/* RUN: %clang_cc1 -fsyntax-only %s -std=c89
	* RUN: not %clang_cc1 -fsyntax-only %s -std=c99 -pedantic-errors
	*/

	int A() {
	return X();
	}