Rollup merge of #105897 - oli-obk:tait_patterns, r=TaKO8Ki

Fix an opaque type ICE

fixes #104551

The issue is that if you have

```rust
type T = impl Sized;
let (_a, _b): T = ..
```

we have only the type annotation `T`, but want to use that ascription for `_a` and `_b`, so what we generate is a type ascription plus a field projection saying `_a`'s type is `T::0`. Of course `T` has no fields. Of course we could also not generate type annotations for projections into opaque types at all, but that's more fragile, as we now have to make sure that https://github.com/rust-lang/rust/blob/12bbdbdb440119a0b86d2ee742ec1460cdb2c5b9/compiler/rustc_mir_build/src/build/matches/mod.rs#L709 doesn't have any arm that introduces a user type annotation except for `PatKind::Binding`.

0 files changed, 0 insertions, 0 deletions