src/test/run-pass/last-use-corner-cases.rs


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

fn main() {
    // Make sure closing over can be a last use
    let q = ~10;
    let addr = ptr::addr_of(*q);
    let f = fn@() -> *int { ptr::addr_of(*q) };
    assert addr == f();

    // But only when it really is the last use
    let q = ~20;
    let f = fn@() -> *int { ptr::addr_of(*q) };
    assert ptr::addr_of(*q) != f();

    // Ensure function arguments and box arguments interact sanely.
    fn call_me(x: fn() -> int, y: ~int) { assert x() == *y; }
    let q = ~30;
    call_me({|| *q}, q);

    // Check that no false positives are found in loops.
    let mut q = ~40, p = 10;
    loop {
        let i = q;
        p += *i;
        if p > 100 { break; }
    }

    // Verify that blocks can't interfere with each other.
    fn two_blocks(a: fn(), b: fn()) { a(); b(); a(); b(); }
    let q = ~50;
    two_blocks({|| let a = q; assert *a == 50;},
               {|| let a = q; assert *a == 50;});
}