mirror of https://github.com/rust-lang/rust
25 lines
392 B
Rust
25 lines
392 B
Rust
//@ run-pass
|
|
// Test by-ref capture of environment in unboxed closure types
|
|
|
|
fn call_fn<F: Fn()>(f: F) {
|
|
f()
|
|
}
|
|
|
|
fn call_fn_mut<F: FnMut()>(mut f: F) {
|
|
f()
|
|
}
|
|
|
|
fn call_fn_once<F: FnOnce()>(f: F) {
|
|
f()
|
|
}
|
|
|
|
fn main() {
|
|
let mut x = 0_usize;
|
|
let y = 2_usize;
|
|
|
|
call_fn(|| assert_eq!(x, 0));
|
|
call_fn_mut(|| x += y);
|
|
call_fn_once(|| x += y);
|
|
assert_eq!(x, y * 2);
|
|
}
|