19 lines
370 B
Rust
19 lines
370 B
Rust
// Checks that regions which appear in a trait object type are
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// observed by the variance inference algorithm (and hence
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// `TOption` is contavariant w/r/t `'a` and not bivariant).
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//
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// Issue #18262.
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#![feature(rustc_attrs)]
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use std::mem;
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trait T { fn foo(&self); }
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#[rustc_variance]
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struct TOption<'a> { //~ ERROR [-]
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v: Option<Box<T + 'a>>,
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}
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fn main() { }
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