rust/src/test/run-pass/borrowck-mut-vec-as-imm-slice.rs

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fn want_slice(v: &[int]) -> int {
let mut sum = 0;
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for vec::each(v) |i| { sum += i; }
ret sum;
}
fn has_mut_vec(+v: ~[mut int]) -> int {
want_slice(v)
}
fn main() {
assert has_mut_vec(~[mut 1, 2, 3]) == 6;
}