eval does nothing when directly called via mrb_funcall

[i110]

After 48e0bbb, the following code says nothing:

int main(int argc, char **argv)
{
    mrb_state *mrb = mrb_open();

    mrb_value code = mrb_str_new_cstr(mrb, "puts :hoge");
    mrb_funcall(mrb, mrb_top_self(mrb), "eval", 1, code);

    mrb_close(mrb);
}

while before that commit (as far as I know at 4325707), it output hoge, which is expected behavior.

I looked eval.c and vm.c, then I found it's not designed to call eval directly via mrb_funcall and others. Is this change what you intended?

FYI: I found the following workaround works well (but looks bad)

mrb_value proc = mrb_load_string(mrb, "Proc.new do |code| eval code end");
mrb_funcall(mrb, proc, "call", 1, code);