diff options
Diffstat (limited to 'src/test/ui/traits/issue-83538-tainted-cache-after-cycle.rs')
-rw-r--r-- | src/test/ui/traits/issue-83538-tainted-cache-after-cycle.rs | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/test/ui/traits/issue-83538-tainted-cache-after-cycle.rs b/src/test/ui/traits/issue-83538-tainted-cache-after-cycle.rs new file mode 100644 index 000000000..3cd68ff6f --- /dev/null +++ b/src/test/ui/traits/issue-83538-tainted-cache-after-cycle.rs @@ -0,0 +1,66 @@ +// Regression test for issue #83538. The problem here is that we have +// two cycles: +// +// * `Ty` embeds `Box<Ty>` indirectly, which depends on `Global: 'static`, which is OkModuloRegions. +// * But `Ty` also references `First`, which has a cycle on itself. That should just be `Ok`. +// +// But our caching mechanism was blending both cycles and giving the incorrect result. + +#![feature(rustc_attrs)] +#![allow(bad_style)] + +struct First { + b: Vec<First>, +} + +pub struct Second { + d: Vec<First>, +} + +struct Third<'a, f> { + g: Vec<(f, &'a f)>, +} + +enum Ty { + j(Fourth, Fifth, Sixth), +} + +struct Fourth { + o: Vec<Ty>, +} + +struct Fifth { + bounds: First, +} + +struct Sixth { + p: Box<Ty>, +} + +#[rustc_evaluate_where_clauses] +fn forward<'a>() +where + Vec<First>: Unpin, + Third<'a, Ty>: Unpin, +{ +} + +#[rustc_evaluate_where_clauses] +fn reverse<'a>() +where + Third<'a, Ty>: Unpin, + Vec<First>: Unpin, +{ +} + +fn main() { + // Key is that Vec<First> is "ok" and Third<'_, Ty> is "ok modulo regions": + + forward(); + //~^ ERROR evaluate(Binder(TraitPredicate(<std::vec::Vec<First> as std::marker::Unpin>, polarity:Positive), [])) = Ok(EvaluatedToOk) + //~| ERROR evaluate(Binder(TraitPredicate(<Third<'_, Ty> as std::marker::Unpin>, polarity:Positive), [])) = Ok(EvaluatedToOkModuloRegions) + + reverse(); + //~^ ERROR evaluate(Binder(TraitPredicate(<std::vec::Vec<First> as std::marker::Unpin>, polarity:Positive), [])) = Ok(EvaluatedToOk) + //~| ERROR evaluate(Binder(TraitPredicate(<Third<'_, Ty> as std::marker::Unpin>, polarity:Positive), [])) = Ok(EvaluatedToOkModuloRegions) +} |