Fix compiler errors from im crate upgrade
@@ -21,7 +21,7 @@ use crate::idhasher::BuildIdHasher;
use crate::string;
use crate::string::IntoUtf8Bytes;
use crate::string::StringId;
-use crate::Lookup;
+pub use crate::Lookup;
// StringKey is a small impedence matcher around StringId.
// NOTE in particular that it does NOT do de-duplicating serde.
