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27 lines
899 B
Rust
27 lines
899 B
Rust
// Test that impls for these two types are considered ovelapping:
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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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// This is because, for `'a = 'static`, the two types overlap.
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// Effectively for them to be equal to you get:
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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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//~^ ERROR conflicting implementations
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//
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// Note in particular that we do NOT get a future-compatibility warning
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// here. This is because the new leak-check proposed in [MCP 295] does not
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// "error" when these two types are equated.
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//
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// [MCP 295]: https://github.com/rust-lang/compiler-team/issues/295
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fn main() {}
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