45 lines
827 B
Rust
45 lines
827 B
Rust
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// check-pass
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#![allow(unused)]
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trait MiniYokeable<'a> {
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type Output;
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}
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struct MiniYoke<Y: for<'a> MiniYokeable<'a>> {
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pub yokeable: Y,
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}
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fn map_project_broken<Y, P>(
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source: MiniYoke<Y>,
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f: impl for<'a> FnOnce(
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<Y as MiniYokeable<'a>>::Output,
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core::marker::PhantomData<&'a ()>,
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) -> <P as MiniYokeable<'a>>::Output,
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) -> MiniYoke<P>
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where
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Y: for<'a> MiniYokeable<'a>,
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P: for<'a> MiniYokeable<'a>
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{
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unimplemented!()
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}
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struct Bar<'a> {
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string_1: &'a str,
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string_2: &'a str,
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}
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impl<'a> MiniYokeable<'a> for Bar<'static> {
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type Output = Bar<'a>;
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}
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impl<'a> MiniYokeable<'a> for &'static str {
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type Output = &'a str;
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}
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fn demo_broken(bar: MiniYoke<Bar<'static>>) -> MiniYoke<&'static str> {
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map_project_broken(bar, |bar, _| bar.string_1)
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}
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fn main() {}
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