Cargo Features

line-col has no features set by default.

[dependencies]
line-col = { version = "0.2.1", features = ["grapheme-clusters"] }
grapheme-clusters = unicode-segmentation

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.

unicode-segmentation grapheme-clusters?