31 lines
730 B
Rust
31 lines
730 B
Rust
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// Test that `dyn Bar<Item = XX>` uses `'static` as the default object
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// lifetime bound for the type `XX`.
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trait Foo<'a> {
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type Item: 'a + ?Sized;
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fn item(&self) -> Box<Self::Item> { panic!() }
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}
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trait Bar { }
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impl<T> Foo<'_> for T {
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type Item = dyn Bar;
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}
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fn is_static<T>(_: T) where T: 'static { }
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// Here, we default to `dyn Bar + 'a`. Or, we *should*, but the
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// current code forces us into a conservative, hacky path.
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fn bar<'a>(x: &'a str) -> &'a dyn Foo<'a, Item = dyn Bar> { &() }
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//~^ ERROR please supply an explicit bound
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fn main() {
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let s = format!("foo");
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let r = bar(&s);
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// If it weren't for the conservative path above, we'd expect an
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// error here.
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is_static(r.item());
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}
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