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24 lines
375 B
Rust
24 lines
375 B
Rust
//@ check-pass
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trait Foo<Args> {
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type Output;
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}
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trait Bar<'a, T>: for<'s> Foo<&'s T, Output=bool> {
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fn cb(&self) -> Box<dyn Bar<'a, T, Output=bool>>;
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}
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impl<'s> Foo<&'s ()> for () {
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type Output = bool;
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}
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impl<'a> Bar<'a, ()> for () {
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fn cb(&self) -> Box<dyn Bar<'a, (), Output=bool>> {
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Box::new(*self)
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}
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}
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fn main() {
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let _t = ().cb();
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}
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