Cargo Features
LinkedHashMap has no features set by default.
[dependencies]
linked-hash-map = { version = "0.5.6", features = ["nightly", "serde_impl", "heapsize_impl"] }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.