eb678ff87f
instead of prefix `..`.
This breaks code that looked like:
match foo {
[ first, ..middle, last ] => { ... }
}
Change this code to:
match foo {
[ first, middle.., last ] => { ... }
}
RFC #55.
Closes #16967.
[breaking-change]
71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
// Copyright 2012 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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enum t { a, b, }
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fn main() {
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let x = a;
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match x { b => { } } //~ ERROR non-exhaustive patterns: `a` not covered
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match true { //~ ERROR non-exhaustive patterns: `false` not covered
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true => {}
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}
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match Some(10i) { //~ ERROR non-exhaustive patterns: `Some(_)` not covered
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None => {}
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}
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match (2i, 3i, 4i) { //~ ERROR non-exhaustive patterns: `(_, _, _)` not covered
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(_, _, 4) => {}
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}
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match (a, a) { //~ ERROR non-exhaustive patterns: `(a, a)` not covered
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(a, b) => {}
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(b, a) => {}
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}
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match a { //~ ERROR non-exhaustive patterns: `b` not covered
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a => {}
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}
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// This is exhaustive, though the algorithm got it wrong at one point
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match (a, b) {
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(a, _) => {}
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(_, a) => {}
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(b, b) => {}
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}
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let vec = vec!(Some(42i), None, Some(21i));
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let vec: &[Option<int>] = vec.as_slice();
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match vec { //~ ERROR non-exhaustive patterns: `[]` not covered
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[Some(..), None, tail..] => {}
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[Some(..), Some(..), tail..] => {}
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[None] => {}
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}
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let vec = vec!(1i);
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let vec: &[int] = vec.as_slice();
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match vec {
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[_, tail..] => (),
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[] => ()
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}
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let vec = vec!(0.5f32);
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let vec: &[f32] = vec.as_slice();
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match vec { //~ ERROR non-exhaustive patterns: `[_, _, _, _]` not covered
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[0.1, 0.2, 0.3] => (),
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[0.1, 0.2] => (),
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[0.1] => (),
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[] => ()
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}
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let vec = vec!(Some(42i), None, Some(21i));
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let vec: &[Option<int>] = vec.as_slice();
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match vec {
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[Some(..), None, tail..] => {}
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[Some(..), Some(..), tail..] => {}
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[None, None, tail..] => {}
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[None, Some(..), tail..] => {}
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[Some(_)] => {}
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[None] => {}
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[] => {}
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}
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}
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