rust/tests/ui/borrowck/borrowck-borrow-mut-base-ptr-in-aliasable-loc.rs
2023-01-11 09:32:08 +00:00

25 lines
513 B
Rust

// Test that attempt to reborrow an `&mut` pointer in an aliasable
// location yields an error.
//
// Example from compiler/rustc_borrowck/borrowck/README.md
fn foo(t0: & &mut isize) {
let t1 = t0;
let p: &isize = &**t0;
**t1 = 22; //~ ERROR cannot assign
}
fn foo3(t0: &mut &mut isize) {
let t1 = &mut *t0;
let p: &isize = &**t0; //~ ERROR cannot borrow
**t1 = 22;
}
fn foo4(t0: & &mut isize) {
let x: &mut isize = &mut **t0; //~ ERROR cannot borrow
*x += 1;
}
fn main() {
}