mirror of https://github.com/rust-lang/rust
67 lines
1.6 KiB
Rust
67 lines
1.6 KiB
Rust
// Regression test for issue #83538. The problem here is that we have
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// two cycles:
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//
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// * `Ty` embeds `Box<Ty>` indirectly, which depends on `Global: 'static`, which is OkModuloRegions.
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// * But `Ty` also references `First`, which has a cycle on itself. That should just be `Ok`.
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//
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// But our caching mechanism was blending both cycles and giving the incorrect result.
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#![feature(rustc_attrs)]
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#![allow(bad_style)]
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struct First {
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b: Vec<First>,
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}
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pub struct Second {
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d: Vec<First>,
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}
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struct Third<'a, f> {
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g: Vec<(f, &'a f)>,
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}
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enum Ty {
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j(Fourth, Fifth, Sixth),
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}
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struct Fourth {
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o: Vec<Ty>,
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}
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struct Fifth {
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bounds: First,
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}
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struct Sixth {
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p: Box<Ty>,
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}
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#[rustc_evaluate_where_clauses]
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fn forward<'a>()
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where
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Vec<First>: Unpin,
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Third<'a, Ty>: Unpin,
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{
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}
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#[rustc_evaluate_where_clauses]
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fn reverse<'a>()
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where
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Third<'a, Ty>: Unpin,
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Vec<First>: Unpin,
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{
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}
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fn main() {
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// Key is that Vec<First> is "ok" and Third<'_, Ty> is "ok modulo regions":
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forward();
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//~^ ERROR evaluate(Binder { value: TraitPredicate(<std::vec::Vec<First> as std::marker::Unpin>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOk)
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//~| ERROR evaluate(Binder { value: TraitPredicate(<Third<'_, Ty> as std::marker::Unpin>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOkModuloRegions)
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reverse();
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//~^ ERROR evaluate(Binder { value: TraitPredicate(<std::vec::Vec<First> as std::marker::Unpin>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOk)
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//~| ERROR evaluate(Binder { value: TraitPredicate(<Third<'_, Ty> as std::marker::Unpin>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOkModuloRegions)
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}
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