mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 00:03:43 +00:00
31 lines
875 B
Rust
31 lines
875 B
Rust
// run-pass
|
|
#![allow(dead_code)]
|
|
#![allow(unused_assignments)]
|
|
// Issue #2263.
|
|
|
|
// pretty-expanded FIXME #23616
|
|
|
|
#![allow(unused_variables)]
|
|
|
|
// Should pass region checking.
|
|
fn ok(f: Box<dyn FnMut(&usize)>) {
|
|
// Here, g is a function that can accept a usize pointer with
|
|
// lifetime r, and f is a function that can accept a usize pointer
|
|
// with any lifetime. The assignment g = f should be OK (i.e.,
|
|
// f's type should be a subtype of g's type), because f can be
|
|
// used in any context that expects g's type. But this currently
|
|
// fails.
|
|
let mut g: Box<dyn for<'r> FnMut(&'r usize)> = Box::new(|x| { });
|
|
g = f;
|
|
}
|
|
|
|
// This version is the same as above, except that here, g's type is
|
|
// inferred.
|
|
fn ok_inferred(f: Box<dyn FnMut(&usize)>) {
|
|
let mut g: Box<dyn for<'r> FnMut(&'r usize)> = Box::new(|_| {});
|
|
g = f;
|
|
}
|
|
|
|
pub fn main() {
|
|
}
|