1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
#![feature(unboxed_closures, tuple_trait)]
// Tests that we can't move out of an unboxed closure environment
// if the upvar is captured by ref or the closure takes self by
// reference.
fn to_fn<A:std::marker::Tuple,F:Fn<A>>(f: F) -> F { f }
fn to_fn_mut<A:std::marker::Tuple,F:FnMut<A>>(f: F) -> F { f }
fn to_fn_once<A:std::marker::Tuple,F:FnOnce<A>>(f: F) -> F { f }
fn main() {
// By-ref cases
{
let x = Box::new(0);
let f = to_fn(|| drop(x)); //~ ERROR cannot move
}
{
let x = Box::new(0);
let f = to_fn_mut(|| drop(x)); //~ ERROR cannot move
}
{
let x = Box::new(0);
let f = to_fn_once(|| drop(x)); // OK -- FnOnce
}
// By-value cases
{
let x = Box::new(0);
let f = to_fn(move || drop(x)); //~ ERROR cannot move
}
{
let x = Box::new(0);
let f = to_fn_mut(move || drop(x)); //~ ERROR cannot move
}
{
let x = Box::new(0);
let f = to_fn_once(move || drop(x)); // this one is ok
}
}
|
