Cargo Features

casco has no features set by default.

casco = { version = "0.4.0", features = ["lexer"] }
lexer = logos

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.

logos lexer?

Enables logos ^0.11.4