1639e51f6e
Until some backwards-compatibility hazards are fixed in #23121, these need to be unstable. [breaking-change]
32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
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(slice_patterns)]
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enum t { a(u), b }
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enum u { c, d }
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fn match_nested_vecs<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
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match (l1, l2) { //~ ERROR non-exhaustive patterns: `(Some([]), Err(_))` not covered
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(Some([]), Ok([])) => "Some(empty), Ok(empty)",
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(Some([_, ..]), Ok(_)) | (Some([_, ..]), Err(())) => "Some(non-empty), any",
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(None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
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(None, Ok([_, _, ..])) => "None, Ok(at least two elements)"
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}
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}
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fn main() {
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let x = t::a(u::c);
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match x { //~ ERROR non-exhaustive patterns: `a(c)` not covered
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t::a(u::d) => { panic!("hello"); }
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t::b => { panic!("goodbye"); }
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}
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}
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