rust/src/test/compile-fail/non-exhaustive-match-nested.rs

// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

enum t { a(u), b }
enum u { c, d }

fn match_nested_vecs<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
    match (l1, l2) { //~ ERROR non-exhaustive patterns: `(Some([]), Err(_))` not covered
        (Some([]), Ok([])) => "Some(empty), Ok(empty)",
        (Some([_, ..]), Ok(_)) | (Some([_, ..]), Err(())) => "Some(non-empty), any",
        (None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
        (None, Ok([_, _, ..])) => "None, Ok(at least two elements)"
    }
}

fn main() {
    let x = a(c);
    match x { //~ ERROR non-exhaustive patterns: `a(c)` not covered
        a(d) => { panic!("hello"); }
        b => { panic!("goodbye"); }
    }
}