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#![feature(rustc_attrs, type_alias_impl_trait, impl_trait_in_assoc_type)]
#![allow(internal_features)]
#![rustc_variance_of_opaques]
trait Captures<'a> {}
impl<T> Captures<'_> for T {}
type NotCapturedEarly<'a> = impl Sized; //~ ERROR ['a: *, 'a: o]
//~^ ERROR: unconstrained opaque type
type CapturedEarly<'a> = impl Sized + Captures<'a>; //~ ERROR ['a: *, 'a: o]
//~^ ERROR: unconstrained opaque type
type NotCapturedLate<'a> = dyn for<'b> Iterator<Item = impl Sized>; //~ ERROR ['a: *, 'a: o, 'b: o]
//~^ ERROR `impl Trait` cannot capture higher-ranked lifetime from `dyn` type
//~| ERROR: unconstrained opaque type
type Captured<'a> = dyn for<'b> Iterator<Item = impl Sized + Captures<'a>>; //~ ERROR ['a: *, 'a: o, 'b: o]
//~^ ERROR `impl Trait` cannot capture higher-ranked lifetime from `dyn` type
//~| ERROR: unconstrained opaque type
type Bar<'a, 'b: 'b, T> = impl Sized; //~ ERROR ['a: *, 'b: *, T: o, 'a: o, 'b: o]
//~^ ERROR: unconstrained opaque type
trait Foo<'i> {
type ImplicitCapture<'a>;
type ExplicitCaptureFromHeader<'a>;
type ExplicitCaptureFromGat<'a>;
}
impl<'i> Foo<'i> for &'i () {
type ImplicitCapture<'a> = impl Sized; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
type ExplicitCaptureFromHeader<'a> = impl Sized + Captures<'i>; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
type ExplicitCaptureFromGat<'a> = impl Sized + Captures<'a>; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
}
impl<'i> Foo<'i> for () {
type ImplicitCapture<'a> = impl Sized; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
type ExplicitCaptureFromHeader<'a> = impl Sized + Captures<'i>; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
type ExplicitCaptureFromGat<'a> = impl Sized + Captures<'a>; //~ ERROR ['i: *, 'a: *, 'i: o, 'a: o]
//~^ ERROR: unconstrained opaque type
}
trait Nesting<'a> {
type Output;
}
impl<'a> Nesting<'a> for &'a () {
type Output = &'a ();
}
type NestedDeeply<'a> =
impl Nesting< //~ ERROR ['a: *, 'a: o]
'a,
Output = impl Nesting< //~ ERROR ['a: *, 'a: o]
'a,
Output = impl Nesting< //~ ERROR ['a: *, 'a: o]
'a,
Output = impl Nesting< //~ ERROR ['a: *, 'a: o]
'a,
Output = impl Nesting<'a> //~ ERROR ['a: *, 'a: o]
>
>,
>,
>;
#[define_opaque(NestedDeeply)]
fn test<'a>() -> NestedDeeply<'a> {
&()
}
fn main() {}
|
