Cargo Features

[dependencies]
docstrings = { version = "0.1.1", default-features = false, features = ["pulldown-cmark"] }
default = pulldown-cmark

The pulldown-cmark feature is set by default whenever docstrings is added without default-features = false somewhere in the dependency tree.

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.

pulldown-cmark default

Enables pulldown-cmark ^0.0.14

Optional because rustc ships it and one might want to use that one.