45 lines
996 B
Rust
45 lines
996 B
Rust
// check-pass
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#![allow(unused_variables)]
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// Issue #12856: a lifetime formal binding introduced by a generic fn
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// should not upset the variance inference for actual occurrences of
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// that lifetime in type expressions.
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pub trait HasLife<'a> {
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fn dummy(&'a self) { } // just to induce a variance on 'a
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}
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trait UseLife01 {
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fn refs<'a, H: HasLife<'a>>(&'a self) -> H;
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}
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trait UseLife02 {
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fn refs<'a, T: 'a, H: HasType<&'a T>>(&'a self) -> H;
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}
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pub trait HasType<T>
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{
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fn dummy(&self, t: T) -> T { panic!() }
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}
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trait UseLife03<T> {
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fn refs<'a, H: HasType<&'a T>>(&'a self) -> H where T: 'a;
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}
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// (The functions below were not actually a problem observed during
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// fixing of #12856; they just seem like natural tests to put in to
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// cover a couple more points in the testing space)
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pub fn top_refs_1<'a, H: HasLife<'a>>(_s: &'a ()) -> H {
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unimplemented!()
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}
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pub fn top_refs_2<'a, T: 'a, H: HasType<&'a T>>(_s: &'a ()) -> H {
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unimplemented!()
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}
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pub fn main() {}
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