rust/tests/ui/borrowck/borrowck-unboxed-closures.rs
2023-01-11 09:32:08 +00:00

18 lines
428 B
Rust

fn a<F:Fn(isize, isize) -> isize>(mut f: F) {
let g = &mut f;
f(1, 2); //~ ERROR cannot borrow `f` as immutable
use_mut(g);
}
fn b<F:FnMut(isize, isize) -> isize>(f: F) {
f(1, 2); //~ ERROR cannot borrow `f` as mutable, as it is not declared as mutable
}
fn c<F:FnOnce(isize, isize) -> isize>(f: F) {
f(1, 2);
f(1, 2); //~ ERROR use of moved value
}
fn main() {}
fn use_mut<T>(_: &mut T) { }