49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
// issue: rust-lang/rust#106874
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// ICE BoundUniversalRegionError
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use std::marker::PhantomData;
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use std::rc::Rc;
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pub fn func<V, F: Fn(&mut V)>(f: F) -> A<impl X> {
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A(B(C::new(D::new(move |st| f(st)))))
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//~^ ERROR implementation of `FnOnce` is not general enough
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//~| ERROR implementation of `Fn` is not general enough
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR implementation of `Fn` is not general enough
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR implementation of `Fn` is not general enough
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR higher-ranked subtype error
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//~| ERROR higher-ranked subtype error
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}
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trait X {}
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trait Y {
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type V;
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}
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struct A<T>(T);
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struct B<T>(Rc<T>);
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impl<T> X for B<T> {}
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struct C<T: Y>(T::V);
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impl<T: Y> C<T> {
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fn new(_: T) -> Rc<Self> {
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todo!()
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}
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}
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struct D<V, F>(F, PhantomData<fn(&mut V)>);
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impl<V, F> D<V, F> {
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fn new(_: F) -> Self {
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todo!()
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}
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}
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impl<V, F: Fn(&mut V)> Y for D<V, F> {
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type V = V;
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}
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pub fn main() {}
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