32 lines
472 B
Rust
32 lines
472 B
Rust
//@ check-pass
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pub trait Foo<'a> {
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type Bar;
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fn foo(&'a self) -> Self::Bar;
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}
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impl<'a, 'b, T: 'a> Foo<'a> for &'b T {
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type Bar = &'a T;
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fn foo(&'a self) -> &'a T {
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self
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}
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}
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pub fn uncallable<T, F>(x: T, f: F)
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where
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T: for<'a> Foo<'a>,
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F: for<'a> Fn(<T as Foo<'a>>::Bar),
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{
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f(x.foo());
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}
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pub fn catalyst(x: &i32) {
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broken(x, |_| {})
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}
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pub fn broken<F: Fn(&i32)>(x: &i32, f: F) {
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uncallable(x, |y| f(y));
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}
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fn main() {}
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