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#![feature(box_patterns)]
#![allow(dead_code)]
#![allow(unused_variables)]
#![deny(unreachable_patterns)]
enum IntList {
Cons(isize, Box<IntList>),
Nil
}
fn tail(source_list: &IntList) -> IntList {
match source_list {
&IntList::Cons(val, box ref next_list) => tail(next_list),
&IntList::Cons(val, box IntList::Nil) => IntList::Cons(val, Box::new(IntList::Nil)),
//~^ ERROR unreachable pattern
_ => panic!(),
}
}
fn main() {}
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