#define __TRY_TRACE() do { \
        printf("trace: %s:%d\n", __FILE__, __LINE__); \
    } while(0) \

#define TRYPTR_NIL(M_expr) ({ void* _result = (void*)(M_expr); if (!_result) { __TRY_TRACE(); return (NULL); } _result; })
#define TRYPTR(M_expr) ({ void* _result = (void*)(M_expr); if (!_result) { __TRY_TRACE(); return (-1); } _result; })

#define TRYST_NIL(M_expr) ({ int _result = (int)(M_expr); if (_result < 0) { __TRY_TRACE(); return (NULL); } _result; })
#define TRYST(M_expr) ({ int _result = (int)(M_expr); if (_result < 0) { __TRY_TRACE(); return (-1); } _result; })