Remove useless extern crate stmt
@@ -1223,9 +1223,6 @@ extern crate core;
extern crate lazy_static;
#[macro_use]
extern crate static_assertions;
-#[cfg(not(feature = "std"))]
-#[cfg(all(feature = "encoder", feature = "block_encoder"))]
-extern crate hashbrown;
#[cfg(all(feature = "encoder", feature = "block_encoder"))]
mod block_enc;
