1 #![allow(warnings)]
2 #![feature(in_band_lifetimes)]
3 
foo(x: &'a u32) -> &'a u324 fn foo(x: &'a u32) -> &'a u32 { x }
5 
main()6 fn main() {
7     let mut p = 3;
8     let r = foo(&p);
9     p += 1; //~ ERROR cannot assign to `p` because it is borrowed
10     println!("{}", r);
11 }
12