rust/tests/ui/variance/variance-contravariant-arg-object.rs

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#![allow(dead_code)]
// Test that even when `T` is only used in contravariant position, it
// is treated as invariant.
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trait Get<T> : 'static {
fn get(&self, t: T);
}
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fn get_min_from_max<'min, 'max>(v: Box<dyn Get<&'max i32>>)
-> Box<dyn Get<&'min i32>>
where 'max : 'min
{
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v
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//~^ ERROR lifetime may not live long enough
}
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fn get_max_from_min<'min, 'max>(v: Box<dyn Get<&'min i32>>)
-> Box<dyn Get<&'max i32>>
where 'max : 'min
{
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// Previously OK:
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v
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//~^ ERROR lifetime may not live long enough
}
fn main() { }