mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-24 07:44:10 +00:00
21 lines
380 B
Rust
21 lines
380 B
Rust
// Check that `&mut` objects cannot be borrowed twice, just like
|
|
// other `&mut` pointers.
|
|
|
|
|
|
|
|
trait Foo {
|
|
fn f1(&mut self) -> &();
|
|
fn f2(&mut self);
|
|
}
|
|
|
|
fn test(x: &mut dyn Foo) {
|
|
let y = x.f1();
|
|
x.f2(); //~ ERROR cannot borrow `*x` as mutable
|
|
y.use_ref();
|
|
}
|
|
|
|
fn main() {}
|
|
|
|
trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
|
|
impl<T> Fake for T { }
|