mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 16:24:46 +00:00
f7237f16ae
git-subtree-dir: compiler/rustc_codegen_gcc git-subtree-mainline:ae90dcf020git-subtree-split:afae271d5d
98 lines
3.0 KiB
Rust
98 lines
3.0 KiB
Rust
// Based on https://github.com/rust-lang/rust/blob/c5840f9d252c2f5cc16698dbf385a29c5de3ca07/src/test/ui/array-slice-vec/subslice-patterns-const-eval-match.rs
|
|
|
|
// Test that array subslice patterns are correctly handled in const evaluation.
|
|
|
|
// run-pass
|
|
|
|
#[derive(PartialEq, Debug, Clone)]
|
|
struct N(u8);
|
|
|
|
#[derive(PartialEq, Debug, Clone)]
|
|
struct Z;
|
|
|
|
macro_rules! n {
|
|
($($e:expr),* $(,)?) => {
|
|
[$(N($e)),*]
|
|
}
|
|
}
|
|
|
|
// This macro has an unused variable so that it can be repeated base on the
|
|
// number of times a repeated variable (`$e` in `z`) occurs.
|
|
macro_rules! zed {
|
|
($e:expr) => { Z }
|
|
}
|
|
|
|
macro_rules! z {
|
|
($($e:expr),* $(,)?) => {
|
|
[$(zed!($e)),*]
|
|
}
|
|
}
|
|
|
|
// Compare constant evaluation and runtime evaluation of a given expression.
|
|
macro_rules! compare_evaluation {
|
|
($e:expr, $t:ty $(,)?) => {{
|
|
const CONST_EVAL: $t = $e;
|
|
const fn const_eval() -> $t { $e }
|
|
static CONST_EVAL2: $t = const_eval();
|
|
let runtime_eval = $e;
|
|
assert_eq!(CONST_EVAL, runtime_eval);
|
|
assert_eq!(CONST_EVAL2, runtime_eval);
|
|
}}
|
|
}
|
|
|
|
// Repeat `$test`, substituting the given macro variables with the given
|
|
// identifiers.
|
|
//
|
|
// For example:
|
|
//
|
|
// repeat! {
|
|
// ($name); X; Y:
|
|
// struct $name;
|
|
// }
|
|
//
|
|
// Expands to:
|
|
//
|
|
// struct X; struct Y;
|
|
//
|
|
// This is used to repeat the tests using both the `N` and `Z`
|
|
// types.
|
|
macro_rules! repeat {
|
|
(($($dollar:tt $placeholder:ident)*); $($($values:ident),+);*: $($test:tt)*) => {
|
|
macro_rules! single {
|
|
($($dollar $placeholder:ident),*) => { $($test)* }
|
|
}
|
|
$(single!($($values),+);)*
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
repeat! {
|
|
($arr $Ty); n, N; z, Z:
|
|
compare_evaluation!({ let [_, x @ .., _] = $arr!(1, 2, 3, 4); x }, [$Ty; 2]);
|
|
compare_evaluation!({ let [_, ref x @ .., _] = $arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
|
|
compare_evaluation!({ let [_, x @ .., _] = &$arr!(1, 2, 3, 4); x }, &'static [$Ty; 2]);
|
|
|
|
compare_evaluation!({ let [_, _, x @ .., _, _] = $arr!(1, 2, 3, 4); x }, [$Ty; 0]);
|
|
compare_evaluation!(
|
|
{ let [_, _, ref x @ .., _, _] = $arr!(1, 2, 3, 4); x },
|
|
&'static [$Ty; 0],
|
|
);
|
|
compare_evaluation!(
|
|
{ let [_, _, x @ .., _, _] = &$arr!(1, 2, 3, 4); x },
|
|
&'static [$Ty; 0],
|
|
);
|
|
|
|
compare_evaluation!({ let [_, .., x] = $arr!(1, 2, 3, 4); x }, $Ty);
|
|
compare_evaluation!({ let [_, .., ref x] = $arr!(1, 2, 3, 4); x }, &'static $Ty);
|
|
compare_evaluation!({ let [_, _y @ .., x] = &$arr!(1, 2, 3, 4); x }, &'static $Ty);
|
|
}
|
|
|
|
compare_evaluation!({ let [_, .., N(x)] = n!(1, 2, 3, 4); x }, u8);
|
|
compare_evaluation!({ let [_, .., N(ref x)] = n!(1, 2, 3, 4); x }, &'static u8);
|
|
compare_evaluation!({ let [_, .., N(x)] = &n!(1, 2, 3, 4); x }, &'static u8);
|
|
|
|
compare_evaluation!({ let [N(x), .., _] = n!(1, 2, 3, 4); x }, u8);
|
|
compare_evaluation!({ let [N(ref x), .., _] = n!(1, 2, 3, 4); x }, &'static u8);
|
|
compare_evaluation!({ let [N(x), .., _] = &n!(1, 2, 3, 4); x }, &'static u8);
|
|
}
|