fprintf(stderr, "FAIL strto"#class"('%s') returned wrong end: %p (+%zi) instead of %p (+%zi)\n",\
in,end,end-in,in+ofs,(size_t)ofs);\
fprintf(stderr, "FAIL strto"#class"('%s') returned wrong end: %p (+%zi) instead of %p (+%zi)\n",\
in,end,end-in,in+ofs,(size_t)ofs);\