Cargo Features

rustpython-common has no features set by default.

rustpython-common = { version = "0.3.1", features = ["threading"] }
threading = parking_lot

Affects rc::PyRc

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.

parking_lot threading?