2014-06-25 12:07:37 -05:00
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// 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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2015-03-22 15:13:15 -05:00
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// pretty-expanded FIXME #23616
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2014-09-06 15:52:07 -05:00
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#![feature(advanced_slice_patterns)]
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2014-06-25 12:07:37 -05:00
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fn match_vecs<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
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match (l1, l2) {
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([], []) => "both empty",
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([], [..]) | ([..], []) => "one empty",
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([..], [..]) => "both non-empty"
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}
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}
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fn match_vecs_cons<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
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match (l1, l2) {
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([], []) => "both empty",
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([], [_, ..]) | ([_, ..], []) => "one empty",
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([_, ..], [_, ..]) => "both non-empty"
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}
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}
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fn match_vecs_snoc<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
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match (l1, l2) {
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([], []) => "both empty",
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([], [.., _]) | ([.., _], []) => "one empty",
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([.., _], [.., _]) => "both non-empty"
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}
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}
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fn match_nested_vecs_cons<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
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match (l1, l2) {
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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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_ => "other"
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}
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}
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fn match_nested_vecs_snoc<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
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match (l1, l2) {
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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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_ => "other"
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}
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}
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fn main() {
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs(&[1, 2], &[2, 3]), "both non-empty");
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assert_eq!(match_vecs(&[], &[1, 2, 3, 4]), "one empty");
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2014-06-25 12:07:37 -05:00
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assert_eq!(match_vecs::<uint>(&[], &[]), "both empty");
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs(&[1, 2, 3], &[]), "one empty");
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2014-06-25 12:07:37 -05:00
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs_cons(&[1, 2], &[2, 3]), "both non-empty");
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assert_eq!(match_vecs_cons(&[], &[1, 2, 3, 4]), "one empty");
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2014-06-25 12:07:37 -05:00
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assert_eq!(match_vecs_cons::<uint>(&[], &[]), "both empty");
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs_cons(&[1, 2, 3], &[]), "one empty");
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2014-06-25 12:07:37 -05:00
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs_snoc(&[1, 2], &[2, 3]), "both non-empty");
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assert_eq!(match_vecs_snoc(&[], &[1, 2, 3, 4]), "one empty");
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2014-06-25 12:07:37 -05:00
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assert_eq!(match_vecs_snoc::<uint>(&[], &[]), "both empty");
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_vecs_snoc(&[1, 2, 3], &[]), "one empty");
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2014-06-25 12:07:37 -05:00
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2015-02-18 04:42:01 -06:00
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assert_eq!(match_nested_vecs_cons(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
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2014-08-06 04:59:40 -05:00
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"None, Ok(at least two elements)");
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2014-06-25 12:07:37 -05:00
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assert_eq!(match_nested_vecs_cons::<uint>(None, Err(())), "None, Ok(less than one element)");
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2014-08-06 04:59:40 -05:00
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assert_eq!(match_nested_vecs_cons::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
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"Some(empty), Ok(empty)");
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
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assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
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2014-08-06 04:59:40 -05:00
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"Some(non-empty), any");
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2014-06-25 12:07:37 -05:00
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2015-02-18 04:42:01 -06:00
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assert_eq!(match_nested_vecs_snoc(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
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2014-08-06 04:59:40 -05:00
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"None, Ok(at least two elements)");
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2014-06-25 12:07:37 -05:00
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assert_eq!(match_nested_vecs_snoc::<uint>(None, Err(())), "None, Ok(less than one element)");
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2014-08-06 04:59:40 -05:00
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assert_eq!(match_nested_vecs_snoc::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
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"Some(empty), Ok(empty)");
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2015-01-25 15:05:03 -06:00
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assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
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assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
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2014-08-06 04:59:40 -05:00
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"Some(non-empty), any");
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2014-06-25 12:07:37 -05:00
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}
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