Jonathan Brouwer 4e64a8b568 Rollup merge of #153581 - nnethercote:rm-cycle_stash, r=oli-obk ...

Simplify `type_of_opaque`.

There is a bunch of complexity supporting the "cannot check whether the hidden type of opaque type satisfies auto traits" error that shows up in `tests/ui/impl-trait/auto-trait-leak.rs`. This is an obscure error that shows up in a single test. If we are willing to downgrade that error message to a cycle error, we can do the following.

- Simplify the `type_of_opaque` return value.
- Remove the `cycle_stash` query modifier.
- Remove the `CyclePlaceholder` type.
- Remove the `SelectionError::OpaqueTypeAutoTraitLeakageUnknown` variant.
- Remove a `FromCycleError` impl.
- Remove `report_opaque_type_auto_trait_leakage`.
- Remove the `StashKey::Cycle` variant.
- Remove the `CycleErrorHandling::Stash` variant.

That's a lot! I think this is a worthwhile trade-off.

r? @oli-obk

2026-03-11 22:05:43 +01:00

..

src

Rollup merge of #153581 - nnethercote:rm-cycle_stash, r=oli-obk

2026-03-11 22:05:43 +01:00

Cargo.toml

Remove deterministic picking from query cycle handling

2026-02-23 01:31:59 +01:00