`method_missing` might have updated stack beyond boundary; fix
MODIFY
src/vm.c
src/vm.c
@@ -395,6 +395,7 @@ mrb_funcall_with_block(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc
mrb_method_missing(mrb, mid, self, args);
}
mrb_ary_unshift(mrb, args, mrb_symbol_value(mid));
+ stack_extend(mrb, n+2);
mrb->c->stack[n+1] = args;
argc = -1;
}

`method_missing` might have updated stack beyond boundary; fix #3599