rust/tests/ui/borrowck/borrowck-borrow-of-mut-base-ptr-safe.rs
2024-02-16 20:02:50 +00:00

22 lines
550 B
Rust

//@ run-pass
#![allow(dead_code)]
#![allow(unused_mut)]
#![allow(unused_variables)]
// Test that freezing an `&mut` pointer while referent is
// frozen is legal.
//
// Example from compiler/rustc_borrowck/borrowck/README.md
//@ pretty-expanded FIXME #23616
fn foo<'a>(mut t0: &'a mut isize,
mut t1: &'a mut isize) {
let p: &isize = &*t0; // Freezes `*t0`
let mut t2 = &t0;
let q: &isize = &**t2; // Freezes `*t0`, but that's ok...
let r: &isize = &*t0; // ...after all, could do same thing directly.
}
pub fn main() {
}