23 lines
593 B
Rust
23 lines
593 B
Rust
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// Taken from https://github.com/rust-lang/rust/issues/44454#issuecomment-1175925928
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trait Trait<ARG: 'static>: 'static {
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type Assoc: AsRef<str>;
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}
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fn hr<T: ?Sized, ARG>(x: T::Assoc) -> Box<dyn AsRef<str> + 'static>
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where
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T: Trait<ARG>
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{
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Box::new(x)
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}
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fn extend_lt<'a>(x: &'a str) -> Box<dyn AsRef<str> + 'static> {
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type DynTrait = dyn for<'a> Trait<&'a str, Assoc = &'a str>;
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hr::<DynTrait, _>(x) //~ ERROR: borrowed data escapes outside of function
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}
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fn main() {
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let extended = extend_lt(&String::from("hello"));
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println!("{}", extended.as_ref().as_ref());
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}
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