44 lines
973 B
Rust
44 lines
973 B
Rust
// ... continued from ./min-choice.rs
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// check-fail
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trait Cap<'a> {}
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impl<T> Cap<'_> for T {}
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fn type_test<'a, T: 'a>() -> &'a u8 { &0 }
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// Make sure we don't pick `'b`.
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fn test_b<'a, 'b, 'c, T>() -> impl Cap<'a> + Cap<'b> + Cap<'c>
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where
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'a: 'b,
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'a: 'c,
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T: 'b,
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{
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type_test::<'_, T>() // This should pass if we pick 'b.
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//~^ ERROR the parameter type `T` may not live long enough
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}
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// Make sure we don't pick `'c`.
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fn test_c<'a, 'b, 'c, T>() -> impl Cap<'a> + Cap<'b> + Cap<'c>
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where
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'a: 'b,
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'a: 'c,
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T: 'c,
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{
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type_test::<'_, T>() // This should pass if we pick 'c.
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//~^ ERROR the parameter type `T` may not live long enough
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}
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// We need to pick min_choice from `['b, 'c]`, but it's ambiguous which one to pick because
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// they're incomparable.
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fn test_ambiguous<'a, 'b, 'c>(s: &'a u8) -> impl Cap<'b> + Cap<'c>
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where
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'a: 'b,
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'a: 'c,
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{
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s
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//~^ ERROR captures lifetime that does not appear in bounds
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}
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fn main() {}
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