https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119121
--- Comment #1 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
Introduced in g:65b4cba9d6a9ffe9b4d4bdff90727a7064cc0e3b
The `is_reference_v<_Vp>` should use `_Tp` instead.
```
template<typename _Tp, typename _Up, typename _Vp>
concept __pair_like_convertible_from
- = !range<_Tp> && __pair_like<_Tp>
+ = !range<_Tp> && !is_reference_v<_Vp> && __pair_like<_Tp>
&& constructible_from<_Tp, _Up, _Vp>
&& __convertible_to_non_slicing<_Up, tuple_element_t<0, _Tp>>
&& convertible_to<_Vp, tuple_element_t<1, _Tp>>;
```
This check was previously part of `__pair_like` concept.
