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]
44 lines
1.4 KiB
Rust
44 lines
1.4 KiB
Rust
// Copyright 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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struct Foo {
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string: String
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}
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pub fn main() {
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let x = [
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Foo { string: "foo".to_string() },
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Foo { string: "bar".to_string() },
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Foo { string: "baz".to_string() }
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];
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match x {
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[ref first, tail..] => {
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assert!(first.string == "foo".to_string());
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assert_eq!(tail.len(), 2);
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assert!(tail[0].string == "bar".to_string());
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assert!(tail[1].string == "baz".to_string());
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match tail {
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[Foo { .. }, _, Foo { .. }, _tail..] => {
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unreachable!();
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}
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[Foo { string: ref a }, Foo { string: ref b }] => {
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assert_eq!("bar", a.as_slice().slice(0, a.len()));
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assert_eq!("baz", b.as_slice().slice(0, b.len()));
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}
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_ => {
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unreachable!();
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}
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}
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}
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}
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}
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