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#if __STDC_VERSION__ >= 201710L
#define compiletimeassert(cond) _Static_assert(cond)
#elif __STDC_VERSION__ >= 201112L
#define compiletimeassert(cond) _Static_assert(cond,"")
#else
#define __X(x, y) x ## y
#define __Y(x, y) __X(x, y)
#define compiletimeassert(cond) struct __Y(foo,__LINE__) { char __temp[1 - (!(cond))*2]; };
#endif