Cargo Features

im has no features set by default.

[dependencies]
im = { version = "15.1.0", features = ["debug", "quickcheck", "rayon", "refpool", "serde", "arbitrary", "proptest"] }
debug

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

quickcheck implicit feature

With default features

Affects lib::quickcheck

rayon implicit feature
refpool implicit feature
serde implicit feature

With default (std)

arbitrary implicit feature

Affects lib::arbitrary

proptest implicit feature

With default features