This file tests for a bug reported by Roman Cheplyaka on 2014-02-21.
All results should be YES, but cpphs was giving NO for the first one.
#define x (1 == 1)
#if x
YES
#else
NO
#endif

#if (1 == 1)
YES
#else
NO
#endif

#define x 1 == 1
#if x
YES
#else
NO
#endif

#define x 0 == 0
#if x
YES
#else
NO
#endif