40 lines
745 B
Rust
40 lines
745 B
Rust
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// check-pass
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// known-bug: #84591
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// Should fail. Subtrait can incorrectly extend supertrait lifetimes even when
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// supertrait has weaker implied bounds than subtrait. Strongly related to
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// issue #25860.
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trait Subtrait<T>: Supertrait {}
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trait Supertrait {
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fn action(self);
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}
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fn subs_to_soup<T, U>(x: T)
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where
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T: Subtrait<U>,
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{
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soup(x)
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}
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fn soup<T: Supertrait>(x: T) {
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x.action();
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}
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impl<'a, 'b: 'a> Supertrait for (&'b str, &mut &'a str) {
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fn action(self) {
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*self.1 = self.0;
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}
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}
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impl<'a, 'b> Subtrait<&'a &'b str> for (&'b str, &mut &'a str) {}
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fn main() {
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let mut d = "hi";
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{
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let x = "Hello World".to_string();
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subs_to_soup((x.as_str(), &mut d));
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}
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println!("{}", d);
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}
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