33 lines
864 B
Rust
33 lines
864 B
Rust
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// Regression test for #53570. Here, we need to propagate that `T: 'a`
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// but in some versions of NLL we were propagating a stronger
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// requirement that `T: 'static`. This arose because we actually had
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// to propagate both that `T: 'a` but also `T: 'b` where `'b` is the
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// higher-ranked lifetime that appears in the type of the closure
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// parameter `x` -- since `'b` cannot be expressed in the caller's
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// space, that got promoted th `'static`.
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//
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// compile-pass
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use std::cell::{RefCell, Ref};
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trait AnyVec<'a> {
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}
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trait GenericVec<T> {
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fn unwrap<'a, 'b>(vec: &'b AnyVec<'a>) -> &'b [T] where T: 'a;
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}
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struct Scratchpad<'a> {
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buffers: RefCell<Box<AnyVec<'a>>>,
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}
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impl<'a> Scratchpad<'a> {
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fn get<T: GenericVec<T>>(&self) -> Ref<[T]>
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where T: 'a
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{
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Ref::map(self.buffers.borrow(), |x| T::unwrap(x.as_ref()))
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}
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}
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fn main() { }
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