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
|
// run-pass
#![allow(dead_code)]
fn match_ref(v: Option<isize>) -> isize {
match v {
Some(ref i) => {
*i
}
None => {0}
}
}
fn match_ref_unused(v: Option<isize>) {
match v {
Some(_) => {}
None => {}
}
}
fn impure(_i: isize) {
}
fn match_imm_reg(v: &Option<isize>) {
match *v {
Some(ref i) => {impure(*i)} // OK because immutable
None => {}
}
}
fn match_mut_reg(v: &mut Option<isize>) {
match *v {
Some(ref i) => {impure(*i)} // OK, frozen
None => {}
}
}
pub fn main() {
}
|
