test/Preprocessor/header_lookup1.c - clang - Git at Google

 // RUN: clang-cc -I /usr/include %s -E | grep 'stdio.h.*3.*4'
 #include <stdio.h>
	// RUN: clang-cc -I /usr/include %s -E \| grep 'stdio.h.3.4'
	#include <stdio.h>