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// run-pass
/// 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);
}
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