mirror of https://github.com/rust-lang/rust
38 lines
986 B
Rust
38 lines
986 B
Rust
#![allow(dead_code, unused_variables)]
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//@ run-rustfix
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// Check projection of an associated type out of a higher-ranked trait-bound
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// in the context of a function signature.
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pub trait Foo<T> {
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type A;
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fn get(&self, t: T) -> Self::A;
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}
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fn foo2<I : for<'x> Foo<&'x isize>>(
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x: I::A)
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//~^ ERROR cannot use the associated type of a trait with uninferred generic parameters
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{
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// This case is illegal because we have to instantiate `'x`, and
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// we don't know what region to instantiate it with.
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//
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// This could perhaps be made equivalent to the examples below,
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// specifically for fn signatures.
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}
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fn foo3<I : for<'x> Foo<&'x isize>>(
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x: <I as Foo<&isize>>::A)
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{
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// OK, in this case we spelled out the precise regions involved, though we left one of
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// them anonymous.
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}
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fn foo4<'a, I : for<'x> Foo<&'x isize>>(
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x: <I as Foo<&'a isize>>::A)
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{
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// OK, in this case we spelled out the precise regions involved.
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}
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pub fn main() {}
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