Move subslice pattern tests to alloc/tests/slice.rs

Author: poliorcetics

library/alloc/tests/slice.rs

@@ -1,5 +1,6 @@
 use std::cell::Cell;
 use std::cmp::Ordering::{self, Equal, Greater, Less};
+use std::convert::identity;
 use std::mem;
 use std::panic;
 use std::rc::Rc;
@@ -1778,3 +1779,122 @@ fn repeat_generic_slice() {
     assert_eq!([1, 2, 3, 4].repeat(1), vec![1, 2, 3, 4]);
     assert_eq!([1, 2, 3, 4].repeat(3), vec![1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]);
 }
+
+#[test]
+#[allow(unreachable_patterns)]
+fn subslice_patterns() {
+    // This test comprehensively checks the passing static and dynamic semantics
+    // of subslice patterns `..`, `x @ ..`, `ref x @ ..`, and `ref mut @ ..`
+    // in slice patterns `[$($pat), $(,)?]` .
+
+    #[derive(PartialEq, Debug, Clone)]
+    struct N(u8);
+
+    macro_rules! n {
+        ($($e:expr),* $(,)?) => {
+            [$(N($e)),*]
+        }
+    }
+
+    macro_rules! c {
+        ($inp:expr, $typ:ty, $out:expr $(,)?) => {
+            assert_eq!($out, identity::<$typ>($inp));
+        };
+    }
+
+    macro_rules! m {
+        ($e:expr, $p:pat => $b:expr) => {
+            match $e {
+                $p => $b,
+                _ => panic!(),
+            }
+        };
+    }
+
+    // == Slices ==
+
+    // Matching slices using `ref` patterns:
+    let mut v = vec![N(0), N(1), N(2), N(3), N(4)];
+    let mut vc = (0..=4).collect::<Vec<u8>>();
+
+    let [..] = v[..]; // Always matches.
+    m!(v[..], [N(0), ref sub @ .., N(4)] => c!(sub, &[N], n![1, 2, 3]));
+    m!(v[..], [N(0), ref sub @ ..] => c!(sub, &[N], n![1, 2, 3, 4]));
+    m!(v[..], [ref sub @ .., N(4)] => c!(sub, &[N], n![0, 1, 2, 3]));
+    m!(v[..], [ref sub @ .., _, _, _, _, _] => c!(sub, &[N], &n![] as &[N]));
+    m!(v[..], [_, _, _, _, _, ref sub @ ..] => c!(sub, &[N], &n![] as &[N]));
+    m!(vc[..], [x, .., y] => c!((x, y), (u8, u8), (0, 4)));
+
+    // Matching slices using `ref mut` patterns:
+    let [..] = v[..]; // Always matches.
+    m!(v[..], [N(0), ref mut sub @ .., N(4)] => c!(sub, &mut [N], n![1, 2, 3]));
+    m!(v[..], [N(0), ref mut sub @ ..] => c!(sub, &mut [N], n![1, 2, 3, 4]));
+    m!(v[..], [ref mut sub @ .., N(4)] => c!(sub, &mut [N], n![0, 1, 2, 3]));
+    m!(v[..], [ref mut sub @ .., _, _, _, _, _] => c!(sub, &mut [N], &mut n![] as &mut [N]));
+    m!(v[..], [_, _, _, _, _, ref mut sub @ ..] => c!(sub, &mut [N], &mut n![] as &mut [N]));
+    m!(vc[..], [x, .., y] => c!((x, y), (u8, u8), (0, 4)));
+
+    // Matching slices using default binding modes (&):
+    let [..] = &v[..]; // Always matches.
+    m!(&v[..], [N(0), sub @ .., N(4)] => c!(sub, &[N], n![1, 2, 3]));
+    m!(&v[..], [N(0), sub @ ..] => c!(sub, &[N], n![1, 2, 3, 4]));
+    m!(&v[..], [sub @ .., N(4)] => c!(sub, &[N], n![0, 1, 2, 3]));
+    m!(&v[..], [sub @ .., _, _, _, _, _] => c!(sub, &[N], &n![] as &[N]));
+    m!(&v[..], [_, _, _, _, _, sub @ ..] => c!(sub, &[N], &n![] as &[N]));
+    m!(&vc[..], [x, .., y] => c!((x, y), (&u8, &u8), (&0, &4)));
+
+    // Matching slices using default binding modes (&mut):
+    let [..] = &mut v[..]; // Always matches.
+    m!(&mut v[..], [N(0), sub @ .., N(4)] => c!(sub, &mut [N], n![1, 2, 3]));
+    m!(&mut v[..], [N(0), sub @ ..] => c!(sub, &mut [N], n![1, 2, 3, 4]));
+    m!(&mut v[..], [sub @ .., N(4)] => c!(sub, &mut [N], n![0, 1, 2, 3]));
+    m!(&mut v[..], [sub @ .., _, _, _, _, _] => c!(sub, &mut [N], &mut n![] as &mut [N]));
+    m!(&mut v[..], [_, _, _, _, _, sub @ ..] => c!(sub, &mut [N], &mut n![] as &mut [N]));
+    m!(&mut vc[..], [x, .., y] => c!((x, y), (&mut u8, &mut u8), (&mut 0, &mut 4)));
+
+    // == Arrays ==
+    let mut v = n![0, 1, 2, 3, 4];
+    let vc = [0, 1, 2, 3, 4];
+
+    // Matching arrays by value:
+    m!(v.clone(), [N(0), sub @ .., N(4)] => c!(sub, [N; 3], n![1, 2, 3]));
+    m!(v.clone(), [N(0), sub @ ..] => c!(sub, [N; 4], n![1, 2, 3, 4]));
+    m!(v.clone(), [sub @ .., N(4)] => c!(sub, [N; 4], n![0, 1, 2, 3]));
+    m!(v.clone(), [sub @ .., _, _, _, _, _] => c!(sub, [N; 0], n![] as [N; 0]));
+    m!(v.clone(), [_, _, _, _, _, sub @ ..] => c!(sub, [N; 0], n![] as [N; 0]));
+    m!(v.clone(), [x, .., y] => c!((x, y), (N, N), (N(0), N(4))));
+    m!(v.clone(), [..] => ());
+
+    // Matching arrays by ref patterns:
+    m!(v, [N(0), ref sub @ .., N(4)] => c!(sub, &[N; 3], &n![1, 2, 3]));
+    m!(v, [N(0), ref sub @ ..] => c!(sub, &[N; 4], &n![1, 2, 3, 4]));
+    m!(v, [ref sub @ .., N(4)] => c!(sub, &[N; 4], &n![0, 1, 2, 3]));
+    m!(v, [ref sub @ .., _, _, _, _, _] => c!(sub, &[N; 0], &n![] as &[N; 0]));
+    m!(v, [_, _, _, _, _, ref sub @ ..] => c!(sub, &[N; 0], &n![] as &[N; 0]));
+    m!(vc, [x, .., y] => c!((x, y), (u8, u8), (0, 4)));
+
+    // Matching arrays by ref mut patterns:
+    m!(v, [N(0), ref mut sub @ .., N(4)] => c!(sub, &mut [N; 3], &mut n![1, 2, 3]));
+    m!(v, [N(0), ref mut sub @ ..] => c!(sub, &mut [N; 4], &mut n![1, 2, 3, 4]));
+    m!(v, [ref mut sub @ .., N(4)] => c!(sub, &mut [N; 4], &mut n![0, 1, 2, 3]));
+    m!(v, [ref mut sub @ .., _, _, _, _, _] => c!(sub, &mut [N; 0], &mut n![] as &mut [N; 0]));
+    m!(v, [_, _, _, _, _, ref mut sub @ ..] => c!(sub, &mut [N; 0], &mut n![] as &mut [N; 0]));
+
+    // Matching arrays by default binding modes (&):
+    m!(&v, [N(0), sub @ .., N(4)] => c!(sub, &[N; 3], &n![1, 2, 3]));
+    m!(&v, [N(0), sub @ ..] => c!(sub, &[N; 4], &n![1, 2, 3, 4]));
+    m!(&v, [sub @ .., N(4)] => c!(sub, &[N; 4], &n![0, 1, 2, 3]));
+    m!(&v, [sub @ .., _, _, _, _, _] => c!(sub, &[N; 0], &n![] as &[N; 0]));
+    m!(&v, [_, _, _, _, _, sub @ ..] => c!(sub, &[N; 0], &n![] as &[N; 0]));
+    m!(&v, [..] => ());
+    m!(&v, [x, .., y] => c!((x, y), (&N, &N), (&N(0), &N(4))));
+
+    // Matching arrays by default binding modes (&mut):
+    m!(&mut v, [N(0), sub @ .., N(4)] => c!(sub, &mut [N; 3], &mut n![1, 2, 3]));
+    m!(&mut v, [N(0), sub @ ..] => c!(sub, &mut [N; 4], &mut n![1, 2, 3, 4]));
+    m!(&mut v, [sub @ .., N(4)] => c!(sub, &mut [N; 4], &mut n![0, 1, 2, 3]));
+    m!(&mut v, [sub @ .., _, _, _, _, _] => c!(sub, &mut [N; 0], &mut n![] as &[N; 0]));
+    m!(&mut v, [_, _, _, _, _, sub @ ..] => c!(sub, &mut [N; 0], &mut n![] as &[N; 0]));
+    m!(&mut v, [..] => ());
+    m!(&mut v, [x, .., y] => c!((x, y), (&mut N, &mut N), (&mut N(0), &mut N(4))));
+}