In 377257f063c, elements of structured bindings are copy-initialized.
They should be direct-initialized because the form of the initializer of
the whole structured bindings is a direct-list-initialization.
> [dcl.struct.bind]/1:
> ... and each element is copy-initialized or direct-initialized from
the corresponding element of the assignment-expression as specified by
the form of the initializer. ...
For example,
```cpp
int arr[2]{};
// elements of `[a, b]` should be direct-initialized
auto [a, b]{arr};
```
6f241e3683
