I'm trying to figure out where

lmdb::Environment

is defined (from here https://github.com/pantsbuild/pants/blob/f5ae1533294493d4c6b57db1a8fd4c97c36406e4/src/rust/engine/sharded_lmdb/src/lib.rs#L32). I'm not seeing a

lmdb

directory in

rust/engine/

nor in the

Cargo.toml

. I'm not very Rust savvy 😕