Cargo Features

ipc_ring has no features set by default.

[dependencies]
ipc_ring = { version = "0.2.1", features = ["failpoints"] }
failpoints = fail

unix-only crate (Linux + macOS)

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.

fail failpoints?