32 lines
983 B
Rust
32 lines
983 B
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(box_patterns)]
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#![feature(box_syntax)]
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#![allow(dead_code)]
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#![allow(unused_variables)]
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#![deny(unreachable_patterns)]
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enum IntList {
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Cons(isize, Box<IntList>),
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Nil
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}
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fn tail(source_list: &IntList) -> IntList {
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match source_list {
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&IntList::Cons(val, box ref next_list) => tail(next_list),
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&IntList::Cons(val, box IntList::Nil) => IntList::Cons(val, box IntList::Nil),
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//~^ ERROR unreachable pattern
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_ => panic!()
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}
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}
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fn main() {}
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