test/Preprocessor/expr_define_expansion.c - third_party/swift-clang - Git at Google

 // RUN: %clang_cc1 %s -E -CC -pedantic -verify
 // expected-no-diagnostics

 #define FOO && 1
 #if defined FOO FOO
 #endif
	// RUN: %clang_cc1 %s -E -CC -pedantic -verify
	// expected-no-diagnostics

	#define FOO && 1
	#if defined FOO FOO
	#endif