rust/tests/ui/let-else/let-else-binding-explicit-mut.rs
2023-01-11 09:32:08 +00:00

21 lines
599 B
Rust

// from rfc2005 test suite
// Verify the binding mode shifts - only when no `&` are auto-dereferenced is the
// final default binding mode mutable.
fn main() {
let Some(n) = &&Some(5i32) else { return };
*n += 1; //~ ERROR cannot assign to `*n`, which is behind a `&` reference
let _ = n;
let Some(n) = &mut &Some(5i32) else { return };
*n += 1; //~ ERROR cannot assign to `*n`, which is behind a `&` reference
let _ = n;
let Some(n) = &&mut Some(5i32) else { return };
*n += 1; //~ ERROR cannot assign to `*n`, which is behind a `&` reference
let _ = n;
}