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