27 lines
571 B
Rust
27 lines
571 B
Rust
//@ run-pass
|
|
|
|
#![allow(unused_variables)]
|
|
|
|
pub trait TryTransform {
|
|
fn try_transform<F>(self, f: F)
|
|
where
|
|
Self: Sized,
|
|
F: FnOnce(Self);
|
|
}
|
|
|
|
impl<'a, T> TryTransform for &'a mut T {
|
|
fn try_transform<F>(self, f: F)
|
|
where
|
|
// The bug was that `Self: Sized` caused the lifetime of `this` to "extend" for all
|
|
// of 'a instead of only lasting as long as the binding is used (for just that line).
|
|
Self: Sized,
|
|
F: FnOnce(Self),
|
|
{
|
|
let this: *mut T = self as *mut T;
|
|
f(self);
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
}
|