// run-pass | |
fn mut_head_tail<'a, A>(v: &'a mut [A]) -> Option<(&'a mut A, &'a mut [A])> { | |
match *v { | |
[ref mut head, ref mut tail @ ..] => { | |
Some((head, tail)) | |
} | |
[] => None | |
} | |
} | |
fn main() { | |
let mut v = [1,2,3,4]; | |
match mut_head_tail(&mut v) { | |
None => {}, | |
Some((h,t)) => { | |
*h = 1000; | |
t.reverse(); | |
} | |
} | |
} |