Cargo Features

txn_lock has no features set by default.

txn_lock = { version = "0.9.0", features = ["all", "id", "logging"] }
all = hr-id, logging
id = hr-id
logging all? = log

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

hr-id all? id?
log logging?