vm.c (mrb_funcall_with_block): avoid use of MRB_METHOD_CFUNC_P().
@@ -666,7 +666,7 @@ mrb_funcall_with_block(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc
ci->mid = mid;
ci->proc = MRB_METHOD_PROC_P(m) ? MRB_METHOD_PROC(m) : NULL;
- if (MRB_METHOD_CFUNC_P(m)) {
+ if (ci->proc == NULL) {
ci->stack[0] = self;
val = MRB_METHOD_CFUNC(m)(mrb, self);
cipop(mrb);
