Avoid pointer arithmetic in backtrace.c;
@@ -51,7 +51,7 @@ each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, mrb_code *pc0, each_backtrace_fu
pc = mrb->c->cibase[i].err;
}
else if (i+1 <= ciidx) {
- pc = mrb->c->cibase[i+1].pc - 1;
+ pc = &mrb->c->cibase[i+1].pc[-1];
}
else {
pc = pc0;
