Regression: cannot return value referencing function parameter self #65
Description
Caused by #47.
Such code is used a lot in futures etc., so I would like to support it...
However, I'm not sure if this can be fixed by ways other than changing self argument to self: Pin<&mut Self>.
Code:
use std::pin::Pin;
#[pin_project::pin_project]
struct Struct<T, U> {
#[pin]
pinned: T,
unpinned: U,
}
impl<T, U> Struct<T, U> {
fn get_pin_mut<'a>(mut self: Pin<&'a mut Self>) -> Pin<&'a mut T> {
self.project().pinned
}
}Error:
error[E0515]: cannot return value referencing function parameter `self`
--> src/lib.rs:33:9
|
33 | self.project().pinned
| ----^^^^^^^^^^^^^^^^^
| |
| returns a value referencing data owned by the current function
| `self` is borrowed here
Related: rust-lang/rust#54934