1 // Test that array subslice patterns are correctly handled in const evaluation.
5 #[derive(PartialEq, Debug, Clone)]
8 #[derive(PartialEq, Debug, Clone)]
12 ($($e:expr),* $(,)?) => {
17 // This macro has an unused variable so that it can be repeated base on the
18 // number of times a repeated variable (`$e` in `z`) occurs.
24 ($($e:expr),* $(,)?) => {
29 // Compare constant evaluation and runtime evaluation of a given expression.
30 macro_rules! compare_evaluation {
31 ($e:expr, $t:ty $(,)?) => {{
32 const CONST_EVAL: $t = $e;
33 const fn const_eval() -> $t { $e }
34 static CONST_EVAL2: $t = const_eval();
35 let runtime_eval = $e;
36 assert_eq!(CONST_EVAL, runtime_eval);
37 assert_eq!(CONST_EVAL2, runtime_eval);
41 // Repeat `$test`, substituting the given macro variables with the given
53 // struct X; struct Y;
55 // This is used to repeat the tests using both the `N` and `Z`
58 (($($dollar:tt $placeholder:ident)*); $($($values:ident),+);*: $($test:tt)*) => {
60 ($($dollar $placeholder:ident),*) => { $($test)* }
62 $(single!($($values),+);)*
68 ($arr $Ty); n, N; z, Z:
69 compare_evaluation!({ let [_, x @ .., _] = $arr!(1, 2, 3, 4); x }, [$Ty; 2]);
70 compare_evaluation!({ let [_, ref x @ .., _] = $arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
71 compare_evaluation!({ let [_, x @ .., _] = &$arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
73 compare_evaluation!({ let [_, _, x @ .., _, _] = $arr!(1, 2, 3, 4); x }, [$Ty; 0]);
75 { let [_, _, ref x @ .., _, _] = $arr!(1, 2, 3, 4); x },
79 { let [_, _, x @ .., _, _] = &$arr!(1, 2, 3, 4); x },
83 compare_evaluation!({ let [_, .., x] = $arr!(1, 2, 3, 4); x }, $Ty);
84 compare_evaluation!({ let [_, .., ref x] = $arr!(1, 2, 3, 4); x }, &'static $Ty);
85 compare_evaluation!({ let [_, _y @ .., x] = &$arr!(1, 2, 3, 4); x }, &'static $Ty);
88 compare_evaluation!({ let [_, .., N(x)] = n!(1, 2, 3, 4); x }, u8);
89 compare_evaluation!({ let [_, .., N(ref x)] = n!(1, 2, 3, 4); x }, &'static u8);
90 compare_evaluation!({ let [_, .., N(x)] = &n!(1, 2, 3, 4); x }, &'static u8);
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);