Cargo Features

palaver has no features set by default.

[dependencies]
palaver = { version = "0.3.0-alpha.3", features = ["nightly"] }
nightly = valgrind_request

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.

valgrind_request nightly?