Cargo Features

[dependencies]
env_logger = { version = "0.10.1", default-features = false, features = ["color", "auto-color", "humantime", "regex"] }
default = auto-color, humantime, regex

These default features are set whenever env_logger is added without default-features = false somewhere in the dependency tree.

color auto-color

Enables termcolor

auto-color default = color

Enables is-terminal

humantime default
regex default

env_logger has 5 features without comments.