1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 #![feature(advanced_slice_patterns)]
13 #![feature(slice_patterns)]
15 fn match_vecs<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
17 ([], []) => "both empty",
18 ([], [..]) | ([..], []) => "one empty",
19 ([..], [..]) => "both non-empty"
23 fn match_vecs_cons<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
25 ([], []) => "both empty",
26 ([], [_, ..]) | ([_, ..], []) => "one empty",
27 ([_, ..], [_, ..]) => "both non-empty"
31 fn match_vecs_snoc<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
33 ([], []) => "both empty",
34 ([], [.., _]) | ([.., _], []) => "one empty",
35 ([.., _], [.., _]) => "both non-empty"
39 fn match_nested_vecs_cons<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
41 (Some([]), Ok([])) => "Some(empty), Ok(empty)",
42 (Some([_, ..]), Ok(_)) | (Some([_, ..]), Err(())) => "Some(non-empty), any",
43 (None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
44 (None, Ok([_, _, ..])) => "None, Ok(at least two elements)",
49 fn match_nested_vecs_snoc<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
51 (Some([]), Ok([])) => "Some(empty), Ok(empty)",
52 (Some([.., _]), Ok(_)) | (Some([.., _]), Err(())) => "Some(non-empty), any",
53 (None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
54 (None, Ok([.., _, _])) => "None, Ok(at least two elements)",
60 assert_eq!(match_vecs(&[1, 2], &[2, 3]), "both non-empty");
61 assert_eq!(match_vecs(&[], &[1, 2, 3, 4]), "one empty");
62 assert_eq!(match_vecs::<usize>(&[], &[]), "both empty");
63 assert_eq!(match_vecs(&[1, 2, 3], &[]), "one empty");
65 assert_eq!(match_vecs_cons(&[1, 2], &[2, 3]), "both non-empty");
66 assert_eq!(match_vecs_cons(&[], &[1, 2, 3, 4]), "one empty");
67 assert_eq!(match_vecs_cons::<usize>(&[], &[]), "both empty");
68 assert_eq!(match_vecs_cons(&[1, 2, 3], &[]), "one empty");
70 assert_eq!(match_vecs_snoc(&[1, 2], &[2, 3]), "both non-empty");
71 assert_eq!(match_vecs_snoc(&[], &[1, 2, 3, 4]), "one empty");
72 assert_eq!(match_vecs_snoc::<usize>(&[], &[]), "both empty");
73 assert_eq!(match_vecs_snoc(&[1, 2, 3], &[]), "one empty");
75 assert_eq!(match_nested_vecs_cons(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
76 "None, Ok(at least two elements)");
77 assert_eq!(match_nested_vecs_cons::<usize>(None, Err(())), "None, Ok(less than one element)");
78 assert_eq!(match_nested_vecs_cons::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
79 "Some(empty), Ok(empty)");
80 assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
81 assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
82 "Some(non-empty), any");
84 assert_eq!(match_nested_vecs_snoc(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
85 "None, Ok(at least two elements)");
86 assert_eq!(match_nested_vecs_snoc::<usize>(None, Err(())), "None, Ok(less than one element)");
87 assert_eq!(match_nested_vecs_snoc::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
88 "Some(empty), Ok(empty)");
89 assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
90 assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
91 "Some(non-empty), any");