Allow tests to override the default closure impls #733
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In tests, closures can now explicitly specify `Fn*` impls, in which case the default impls will no longer be emitted. These types of impls are restricted to being non-generic over the type.
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☔ The latest upstream changes (presumably #753) made this pull request unmergeable. Please resolve the merge conflicts. |
| @@ -110,6 +110,21 @@ pub fn add_fn_trait_program_clauses<I: Interner>( | |||
| Ok(()) | |||
| } | |||
| TyKind::Closure(closure_id, substitution) => { | |||
| for custom in db.custom_clauses() { | |||
| if let DomainGoal::LocalImplAllowed(tr) = | |||
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Wait, why do we have to add this LocalImplAllowed? I'm fine with funky testing frameworks, but this seems to be a bit more invasive to the "lower layers" than I would like.
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In tests, closures can now have explicit
Fn*impls, in which case the default impls will no longer be emitted for that closure. These types of impls are restricted to being non-generic over the type. This allows reproducing #688 in a chalk test.The mechanism for this is an absolute hack; if there's any
impl Fn* for MyClosurethen the parser will generate a customLocalImplAllowedclause which is later searched for during WF checking of impls and before emitting default closure impls for that type. The upside of this is that we can re-use the plumbing on the chalk-solve side, especially the WF checking. This probably breaks coherence checking forFn*traits in tests, but that doesn't seem like an issue.