rb_source_location  191 error.c            VALUE file = rb_source_location(&line);
rb_source_location   33 eval_error.c       VALUE sourcefile = rb_source_location(&sourceline);
rb_source_location 1467 internal.h     VALUE rb_source_location(int *pline);
rb_source_location 2663 variable.c         RB_OBJ_WRITE(klass, &ce->file, rb_source_location(&ce->line));
rb_source_location 1207 vm.c               VALUE path = rb_source_location(pline);
rb_source_location 1304 vm_eval.c          file = filename ? filename : rb_source_location(&lineno);