mirror of https://github.com/rust-lang/rust.git
18 lines
811 B
Rust
18 lines
811 B
Rust
//@ revisions: current next
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//@[next] compile-flags: -Znext-solver
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[current] check-pass
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fn prove_proj<R>(_: impl FnOnce() -> R) {}
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fn recur<'a>() -> impl Sized + 'a {
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// The closure has the signature `fn() -> opaque<'1>`. `prove_proj`
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// requires us to prove `<closure as FnOnce<()>>::Output = opaque<'2>`.
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// The old solver uses `replace_opaque_types_with_infer` during normalization
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// to replace `opaque<'2>` with its hidden type. If that hidden type is still an
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// inference variable at this point, we unify it with `opaque<'1>` and
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// end up ignoring that defining use as the hidden type is equal to its key.
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prove_proj(|| recur());
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//[next]~^ ERROR expected generic lifetime parameter, found `'_`
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}
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fn main() {}
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