Regular slot and scoped slot with same name shouldn't be allowed

Version

2.6.10

Reproduction link

https://codepen.io/lee88688/pen/jjPpBm?editors=1010

Steps to reproduce

as seen in codepen, “hello” component have only one slot. but rendered 2 div tag at last. I have a look at Vue’s code renderSlot which seems renderSlot function would treat the normal slot as scoped slot. why it would be like this?

the following code is render function of hello component which is compiled by Vue.compile. _t is renderSlot function. when normal slot and scoped slot in same component the problem above will be present.

(function anonymous() {
    with (this) {
        return _c('div', [_t("default"), _v(" "), _t("default", null, {
            "x": x
        })], 2)
    }
}
)

What is expected?

render just one slot.

What is actually happening?

render one slot twice.

[DrKlonk]

We tried to solve this issue with a small group, but we were unable to reproduce it in Vue 3. In the docs for Vue 3 this seems to be using a different approach. We are unsure if this issue is still relevant for Vue 3.

@kerm1it Does your commit fix the issue? If yes, are you planning on turning this into a PR?

Could you please let us know if this is still an issue? If so, we’d like to help find a solution.

If not, it might be worth it to close this issue.

[kerm1it]

https://github.com/vuejs/vue/pull/10217