Macro rustc_utils::hashset

macro_rules! hashset {
    (@single $($x:tt)*) => { ... };
    (@count $($rest:expr),*) => { ... };
    ($($key:expr,)+) => { ... };
    ($($key:expr),*) => { ... };
}

Utility for hashset literals. Same as maplit::hashset but works with FxHasher.