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21 lines
608 B
Rust
21 lines
608 B
Rust
//@ check-pass
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//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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// A regression test for an error in `redis` while working on #139587.
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//
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// We check for structural equality when adding defining uses of opaques.
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// In this test one defining use had anonymized regions while the other
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// one did not, causing an error.
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struct W<T>(T);
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fn constrain<F: FnOnce(T) -> R, T, R>(f: F) -> R {
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loop {}
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}
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fn foo<'a>(x: for<'b> fn(&'b ())) -> impl Sized + use<'a> {
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let mut r = constrain(foo::<'_>);
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r = W(x);
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r
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}
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fn main() {}
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