Cargo Features

[dependencies]
linkcheck = { version = "0.4.1", default-features = false, features = ["serde-1"] }
default = serde-1

The serde-1 feature is set by default whenever linkcheck is added without default-features = false somewhere in the dependency tree.

serde-1 default = serde

Enables serialization of codespan, serde of url

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.

serde serde-1