rust/src/test/ui/issues/issue-17877.rs

// run-pass
#![feature(slice_patterns)]

fn main() {
    assert_eq!(match [0u8; 1024] {
        _ => 42_usize,
    }, 42_usize);

    assert_eq!(match [0u8; 1024] {
        [1, _..] => 0_usize,
        [0, _..] => 1_usize,
        _ => 2_usize
    }, 1_usize);
}
Add `// run-pass` annotations to all the tests under `ui/run-pass/`. (I may have accidentally added it to some auxilliary crates as well; my emacs-macro-based methodology was pretty crude.) 2018-08-30 07:18:55 -05:00			`// run-pass`
Feature gate all slice patterns. #23121 Until some backwards-compatibility hazards are fixed in #23121, these need to be unstable. [breaking-change] 2015-03-26 20:34:27 -05:00			`#![feature(slice_patterns)]`

Never expand specialized columns that only contain wild patterns in them Doing so would incur deeply nested expansion of the tree with no useful side effects. This is problematic for "wide" data types such as structs with dozens of fields but where only a few are actually being matched or bound. Most notably, matching a fixed slice would use a number of stack frames that grows with the number of elements in the slice. Fixes #17877. 2014-10-11 07:05:16 -05:00			`fn main() {`
Allow use of `[_ ; n]` syntax for fixed length and repeating arrays. This does NOT break any existing programs because the `[_, ..n]` syntax is also supported. 2014-12-19 20:20:51 -06:00			`assert_eq!(match [0u8; 1024] {`
Update suffixes en masse in tests using `perl -p -i -e` 2015-02-18 04:42:01 -06:00			`_ => 42_usize,`
			`}, 42_usize);`
Never expand specialized columns that only contain wild patterns in them Doing so would incur deeply nested expansion of the tree with no useful side effects. This is problematic for "wide" data types such as structs with dozens of fields but where only a few are actually being matched or bound. Most notably, matching a fixed slice would use a number of stack frames that grows with the number of elements in the slice. Fixes #17877. 2014-10-11 07:05:16 -05:00
Allow use of `[_ ; n]` syntax for fixed length and repeating arrays. This does NOT break any existing programs because the `[_, ..n]` syntax is also supported. 2014-12-19 20:20:51 -06:00			`assert_eq!(match [0u8; 1024] {`
Update suffixes en masse in tests using `perl -p -i -e` 2015-02-18 04:42:01 -06:00			`[1, _..] => 0_usize,`
			`[0, _..] => 1_usize,`
			`_ => 2_usize`
			`}, 1_usize);`
Never expand specialized columns that only contain wild patterns in them Doing so would incur deeply nested expansion of the tree with no useful side effects. This is problematic for "wide" data types such as structs with dozens of fields but where only a few are actually being matched or bound. Most notably, matching a fixed slice would use a number of stack frames that grows with the number of elements in the slice. Fixes #17877. 2014-10-11 07:05:16 -05:00			`}`