test/Preprocessor/macro_disable2.c - clang - Git at Google

 // RUN: clang-cc -E %s | grep 'A B C A B A C A B C A'

 #define A A B C
 #define B B C A
 #define C C A B

 A
	// RUN: clang-cc -E %s \| grep 'A B C A B A C A B C A'

	#define A A B C
	#define B B C A
	#define C C A B

	A