1 // Based on https://github.com/rust-lang/rust/blob/c5840f9d252c2f5cc16698dbf385a29c5de3ca07/src/test/ui/array-slice-vec/subslice-patterns-const-eval-match.rs
3 // Test that array subslice patterns are correctly handled in const evaluation.
7 #![feature(slice_patterns)]
9 #[derive(PartialEq, Debug, Clone)]
12 #[derive(PartialEq, Debug, Clone)]
16 ($($e:expr),* $(,)?) => {
21 // This macro has an unused variable so that it can be repeated base on the
22 // number of times a repeated variable (`$e` in `z`) occurs.
28 ($($e:expr),* $(,)?) => {
33 // Compare constant evaluation and runtime evaluation of a given expression.
34 macro_rules! compare_evaluation {
35 ($e:expr, $t:ty $(,)?) => {{
36 const CONST_EVAL: $t = $e;
37 const fn const_eval() -> $t { $e }
38 static CONST_EVAL2: $t = const_eval();
39 let runtime_eval = $e;
40 assert_eq!(CONST_EVAL, runtime_eval);
41 assert_eq!(CONST_EVAL2, runtime_eval);
45 // Repeat `$test`, substituting the given macro variables with the given
57 // struct X; struct Y;
59 // This is used to repeat the tests using both the `N` and `Z`
62 (($($dollar:tt $placeholder:ident)*); $($($values:ident),+);*: $($test:tt)*) => {
64 ($($dollar $placeholder:ident),*) => { $($test)* }
66 $(single!($($values),+);)*
72 ($arr $Ty); n, N; z, Z:
73 compare_evaluation!({ let [_, x @ .., _] = $arr!(1, 2, 3, 4); x }, [$Ty; 2]);
74 compare_evaluation!({ let [_, ref x @ .., _] = $arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
75 compare_evaluation!({ let [_, x @ .., _] = &$arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
77 compare_evaluation!({ let [_, _, x @ .., _, _] = $arr!(1, 2, 3, 4); x }, [$Ty; 0]);
79 { let [_, _, ref x @ .., _, _] = $arr!(1, 2, 3, 4); x },
83 { let [_, _, x @ .., _, _] = &$arr!(1, 2, 3, 4); x },
87 compare_evaluation!({ let [_, .., x] = $arr!(1, 2, 3, 4); x }, $Ty);
88 compare_evaluation!({ let [_, .., ref x] = $arr!(1, 2, 3, 4); x }, &'static $Ty);
89 compare_evaluation!({ let [_, _y @ .., x] = &$arr!(1, 2, 3, 4); x }, &'static $Ty);
92 compare_evaluation!({ let [_, .., N(x)] = n!(1, 2, 3, 4); x }, u8);
93 compare_evaluation!({ let [_, .., N(ref x)] = n!(1, 2, 3, 4); x }, &'static u8);
94 compare_evaluation!({ let [_, .., N(x)] = &n!(1, 2, 3, 4); x }, &'static u8);
96 compare_evaluation!({ let [N(x), .., _] = n!(1, 2, 3, 4); x }, u8);
97 compare_evaluation!({ let [N(ref x), .., _] = n!(1, 2, 3, 4); x }, &'static u8);
98 compare_evaluation!({ let [N(x), .., _] = &n!(1, 2, 3, 4); x }, &'static u8);