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|
// Test that `ref mut x @ ref mut y` and varieties of that are not allowed.
fn main() {
struct U;
fn u() -> U { U }
fn f1(ref mut a @ ref mut b: U) {}
//~^ ERROR cannot borrow value as mutable more than once at a time
fn f2(ref mut a @ ref mut b: U) {}
//~^ ERROR cannot borrow value as mutable more than once at a time
fn f3(
ref mut a @ [
//~^ ERROR cannot borrow value as mutable more than once at a time
[ref b @ .., _],
[_, ref mut mid @ ..],
..,
[..],
] : [[U; 4]; 5]
) {}
fn f4_also_moved(ref mut a @ ref mut b @ c: U) {}
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot move out of value because it is borrowed
//~| ERROR borrow of moved value
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow value as mutable more than once at a time
drop(a);
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
drop(b);
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow value as mutable more than once at a time
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow value as mutable more than once at a time
*a = U;
let ref mut a @ ref mut b = U;
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
*b = U;
let ref mut a @ (
//~^ ERROR cannot borrow value as mutable more than once at a time
ref mut b,
[
ref mut c,
ref mut d,
ref e,
]
) = (U, [U, U, U]);
let ref mut a @ (
//~^ ERROR cannot borrow value as mutable more than once at a time
ref mut b,
[
ref mut c,
ref mut d,
ref e,
]
) = (u(), [u(), u(), u()]);
let a @ (ref mut b, ref mut c) = (U, U);
//~^ ERROR borrow of moved value
let mut val = (U, [U, U]);
let a @ (b, [c, d]) = &mut val; // Same as ^--
//~^ ERROR borrow of moved value
let a @ &mut ref mut b = &mut U;
//~^ ERROR borrow of moved value
let a @ &mut (ref mut b, ref mut c) = &mut (U, U);
//~^ ERROR borrow of moved value
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
}
}
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
*b = U;
}
}
match Ok(U) {
ref mut a @ Ok(ref mut b) | ref mut a @ Err(ref mut b) => {
//~^ ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
*a = Err(U);
// FIXME: The binding name value 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 value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
//~| ERROR cannot borrow value as mutable more than once at a time
drop(a);
}
}
}
|
