832199ee76
Currently the default is "inherited" from context, so e.g. `&impl Foo<Item = dyn Bar>` would default to `&'x impl Foo<Item = dyn Bar + 'x>`, but this triggers an ICE and is not very consistent. This patch doesn't implement what I expect would be the correct semantics, because those are likely too complex. Instead, it handles what I'd expect to be the common case -- where the trait has no lifetime parameters.
28 lines
564 B
Rust
28 lines
564 B
Rust
// Test that we don't get an error with `dyn Bar` in an impl Trait
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// when there are multiple inputs. The `dyn Bar` should default to `+
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// 'static`. This used to erroneously generate an error (cc #62517).
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//
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// check-pass
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trait Foo {
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type Item: ?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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fn bar(x: &str) -> &impl Foo<Item = dyn Bar> { &() }
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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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is_static(r.item());
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}
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