rust/tests/ui/implied-bounds/issue-100690.rs
lcnr 4fa5fb684e move leak check out of candidate evaluation
this prevents higher ranked goals from guiding selection
2024-04-03 22:32:46 +01:00

43 lines
1.1 KiB
Rust

// This code (probably) _should_ compile, but it currently does not because we
// are not smart enough about implied bounds.
use std::io;
fn real_dispatch<T, F>(f: F) -> Result<(), io::Error>
where
F: FnOnce(&mut UIView<T>) -> Result<(), io::Error> + Send + 'static,
{
todo!()
}
#[derive(Debug)]
struct UIView<'a, T: 'a> {
_phantom: std::marker::PhantomData<&'a mut T>,
}
trait Handle<'a, T: 'a, V, R> {
fn dispatch<F>(&self, f: F) -> Result<(), io::Error>
where
F: FnOnce(&mut V) -> R + Send + 'static;
}
#[derive(Debug, Clone)]
struct TUIHandle<T> {
_phantom: std::marker::PhantomData<T>,
}
impl<'a, T: 'a> Handle<'a, T, UIView<'a, T>, Result<(), io::Error>> for TUIHandle<T> {
fn dispatch<F>(&self, f: F) -> Result<(), io::Error>
where
F: FnOnce(&mut UIView<'a, T>) -> Result<(), io::Error> + Send + 'static,
{
real_dispatch(f)
//~^ ERROR lifetime may not live long enough
//~| ERROR implementation of `FnOnce` is not general enough
//~| ERROR mismatched types
//
}
}
fn main() {}