| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| #![feature(advanced_slice_patterns)] |
| #![feature(slice_patterns)] |
| |
| fn match_vecs<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str { |
| match (l1, l2) { |
| ([], []) => "both empty", |
| ([], [..]) | ([..], []) => "one empty", |
| ([..], [..]) => "both non-empty" |
| } |
| } |
| |
| fn match_vecs_cons<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str { |
| match (l1, l2) { |
| ([], []) => "both empty", |
| ([], [_, ..]) | ([_, ..], []) => "one empty", |
| ([_, ..], [_, ..]) => "both non-empty" |
| } |
| } |
| |
| fn match_vecs_snoc<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str { |
| match (l1, l2) { |
| ([], []) => "both empty", |
| ([], [.., _]) | ([.., _], []) => "one empty", |
| ([.., _], [.., _]) => "both non-empty" |
| } |
| } |
| |
| fn match_nested_vecs_cons<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str { |
| match (l1, l2) { |
| (Some([]), Ok([])) => "Some(empty), Ok(empty)", |
| (Some([_, ..]), Ok(_)) | (Some([_, ..]), Err(())) => "Some(non-empty), any", |
| (None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)", |
| (None, Ok([_, _, ..])) => "None, Ok(at least two elements)", |
| _ => "other" |
| } |
| } |
| |
| fn match_nested_vecs_snoc<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str { |
| match (l1, l2) { |
| (Some([]), Ok([])) => "Some(empty), Ok(empty)", |
| (Some([.., _]), Ok(_)) | (Some([.., _]), Err(())) => "Some(non-empty), any", |
| (None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)", |
| (None, Ok([.., _, _])) => "None, Ok(at least two elements)", |
| _ => "other" |
| } |
| } |
| |
| fn main() { |
| assert_eq!(match_vecs(&[1, 2], &[2, 3]), "both non-empty"); |
| assert_eq!(match_vecs(&[], &[1, 2, 3, 4]), "one empty"); |
| assert_eq!(match_vecs::<usize>(&[], &[]), "both empty"); |
| assert_eq!(match_vecs(&[1, 2, 3], &[]), "one empty"); |
| |
| assert_eq!(match_vecs_cons(&[1, 2], &[2, 3]), "both non-empty"); |
| assert_eq!(match_vecs_cons(&[], &[1, 2, 3, 4]), "one empty"); |
| assert_eq!(match_vecs_cons::<usize>(&[], &[]), "both empty"); |
| assert_eq!(match_vecs_cons(&[1, 2, 3], &[]), "one empty"); |
| |
| assert_eq!(match_vecs_snoc(&[1, 2], &[2, 3]), "both non-empty"); |
| assert_eq!(match_vecs_snoc(&[], &[1, 2, 3, 4]), "one empty"); |
| assert_eq!(match_vecs_snoc::<usize>(&[], &[]), "both empty"); |
| assert_eq!(match_vecs_snoc(&[1, 2, 3], &[]), "one empty"); |
| |
| assert_eq!(match_nested_vecs_cons(None, Ok::<&[_], ()>(&[4_usize, 2_usize])), |
| "None, Ok(at least two elements)"); |
| assert_eq!(match_nested_vecs_cons::<usize>(None, Err(())), "None, Ok(less than one element)"); |
| assert_eq!(match_nested_vecs_cons::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])), |
| "Some(empty), Ok(empty)"); |
| assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any"); |
| assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])), |
| "Some(non-empty), any"); |
| |
| assert_eq!(match_nested_vecs_snoc(None, Ok::<&[_], ()>(&[4_usize, 2_usize])), |
| "None, Ok(at least two elements)"); |
| assert_eq!(match_nested_vecs_snoc::<usize>(None, Err(())), "None, Ok(less than one element)"); |
| assert_eq!(match_nested_vecs_snoc::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])), |
| "Some(empty), Ok(empty)"); |
| assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any"); |
| assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])), |
| "Some(non-empty), any"); |
| } |