-rw-r--#[macro_export] macro_rules! hashmap { (@single $($x:tt)*) => (()); (@count $($rest:expr),*) => (<[()]>::len(&[$(hashmap!(@single $rest)),*])); ($($key:expr => $value:expr,)+) => { hashmap!($($key => $value),+) }; ($($key:expr => $value:expr),*) => { { let _cap = hashmap!(@count $($key),*); let mut _map = ::std::collections::HashMap::with_capacity(_cap); $( let _ = _map.insert($key, $value); )* _map } }; }