mirror of https://github.com/rust-lang/rust
27 lines
874 B
Rust
27 lines
874 B
Rust
//@ check-pass
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// These types were previously considered equal as they are subtypes of each other.
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// This has been changed in #118247 and we now consider them to be disjoint.
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//
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// In our test:
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//
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// * `for<'r> fn(fn(&'r u32))`
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// * `fn(fn(&'a u32)` where `'a` is free
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//
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// These were considered equal as for `'a = 'static` subtyping succeeds in both
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// directions:
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//
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// * `for<'r> fn(fn(&'r u32)) <: fn(fn(&'static u32))`
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// * true if `exists<'r> { 'r: 'static }` (obviously true)
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// * `fn(fn(&'static u32)) <: for<'r> fn(fn(&'r u32))`
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// * true if `forall<'r> { 'static: 'r }` (also true)
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trait Trait {}
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impl Trait for for<'r> fn(fn(&'r ())) {}
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impl<'a> Trait for fn(fn(&'a ())) {}
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//~^ WARN conflicting implementations of trait `Trait` for type `for<'r> fn(fn(&'r ()))` [coherence_leak_check]
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//~| WARN the behavior may change in a future release
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fn main() {}
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