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#include <unistd.h>
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#define STRINGIFY(x) #x
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#define TOSTRING(x) STRINGIFY(x)
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#define CURRENT_LOCATION __FILE__ ":" TOSTRING(__LINE__)
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#define err() \
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{ \
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_fail("at " CURRENT_LOCATION " "); \
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}
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#define mb() asm volatile ("" : : : "memory")
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void pass(void);
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void _fail(char *reason);
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