mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 13:04:42 +00:00
17 lines
615 B
Rust
17 lines
615 B
Rust
// Tests how we behave when the user attempts to mutate an immutable
|
|
// binding that was introduced by either `ref` or `ref mut`
|
|
// patterns.
|
|
//
|
|
// Such bindings cannot be made mutable via the mere addition of the
|
|
// `mut` keyword, and thus we want to check that the compiler does not
|
|
// suggest doing so.
|
|
|
|
fn main() {
|
|
let (mut one_two, mut three_four) = ((1, 2), (3, 4));
|
|
let &mut (ref a, ref mut b) = &mut one_two;
|
|
a = &three_four.0;
|
|
//~^ ERROR cannot assign twice to immutable variable `a` [E0384]
|
|
b = &mut three_four.1;
|
|
//~^ ERROR cannot assign twice to immutable variable `b` [E0384]
|
|
}
|