Fix `RegionCtxt::preference_value`.

There's a bad pattern matching confusion present in this function.
`_anon` gets assigned to, and then `_anon` is used as an unbound
variable in the pattern, which is unrelated to the first `_anon`.
If the `_anon` didn't start with `_` the compiler would give warnings.

This was introduced in #104239.

I have rewritten the function to remove the confusion and preserve the
existing behaviour. This seems safest, because the original intent is
not clear.

0 files changed, 0 insertions, 0 deletions