A speedy, non-cryptographic hashing algorithm used by rustc.

Example

# #[cfg(feature = "std")]
# fn main() {
use rustc_hash::FxHashMap;

let mut map: FxHashMap<u32, u32> = FxHashMap::default();
map.insert(22, 44);
# }
# #[cfg(not(feature = "std"))]
# fn main() { }