File: issue-41803.rs

package info (click to toggle)
rustc-web 1.85.0%2Bdfsg3-1~deb12u3
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bookworm-proposed-updates
  • size: 1,759,988 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,056; lisp: 29; perl: 29; ruby: 19; sql: 11
file content (23 lines) | stat: -rw-r--r-- 502 bytes parent folder | download | duplicates (16) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
//@ run-pass
#![allow(unused_macro_rules)]

/// A compile-time map from identifiers to arbitrary (heterogeneous) expressions
macro_rules! ident_map {
    ( $name:ident = { $($key:ident => $e:expr,)* } ) => {
        macro_rules! $name {
            $(
                ( $key ) => { $e };
            )*
            // Empty invocation expands to nothing. Needed when the map is empty.
            () => {};
        }
    };
}

ident_map!(my_map = {
    main => 0,
});

fn main() {
    my_map!(main);
}