69 lines
2.3 KiB
Rust
69 lines
2.3 KiB
Rust
|
// Test that `ref mut x @ ref mut y` and varieties of that are not allowed.
|
||
|
|
|
||
|
|
#![feature(bindings_after_at)]
|
||
|
|
//~^ WARN the feature `bindings_after_at` is incomplete and may cause the compiler to crash
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
struct U;
|
||
|
|
|
||
|
|
let ref mut a @ ref mut b = U;
|
||
|
|
//~^ ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
drop(a);
|
||
|
|
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
|
||
|
|
drop(b);
|
||
|
|
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
|
||
|
|
|
||
|
|
let ref mut a @ ref mut b = U;
|
||
|
|
//~^ ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
*a = U;
|
||
|
|
let ref mut a @ ref mut b = U; // FIXME: This should not compile.
|
||
|
|
*b = U;
|
||
|
|
|
||
|
|
let ref mut a @ (ref mut b, [ref mut c, ref mut d]) = (U, [U, U]);
|
||
|
|
// FIXME: This should not compile.
|
||
|
|
|
||
|
|
let a @ (ref mut b, ref mut c) = (U, U);
|
||
|
|
//~^ ERROR cannot bind by-move with sub-bindings
|
||
|
|
//~| ERROR borrow of moved value
|
||
|
|
let mut val = (U, [U, U]);
|
||
|
|
let a @ (b, [c, d]) = &mut val; // Same as ^--
|
||
|
|
//~^ ERROR cannot bind by-move with sub-bindings
|
||
|
|
//~| ERROR borrow of moved value
|
||
|
|
|
||
|
|
let a @ &mut ref mut b = &mut U;
|
||
|
|
//~^ ERROR cannot bind by-move with sub-bindings
|
||
|
|
//~| ERROR borrow of moved value
|
||
|
|
let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
|
||
|
|
//~^ ERROR cannot bind by-move with sub-bindings
|
||
|
|
//~| ERROR borrow of moved value
|
||
|
|
|
||
|
|
match Ok(U) {
|
||
|
|
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
|
||
|
|
// FIXME: This should not compile.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
match Ok(U) {
|
||
|
|
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
|
||
|
|
*b = U;
|
||
|
|
// FIXME: This should not compile.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
match Ok(U) {
|
||
|
|
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
|
||
|
|
//~^ ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
//~| ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
*a = Err(U);
|
||
|
|
|
||
|
|
// FIXME: The binding name `_` used above makes for problematic diagnostics.
|
||
|
|
// Resolve that somehow...
|
||
|
|
}
|
||
|
|
}
|
||
|
|
match Ok(U) {
|
||
|
|
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
|
||
|
|
//~^ ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
//~| ERROR cannot borrow `_` as mutable more than once at a time
|
||
|
|
drop(a);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|