Cargo Features

[dependencies]
mut-str = { version = "1.1.0-alpha.2", default-features = false, features = ["std", "alloc", "nightly"] }
default = std

The std feature is set by default whenever mut-str is added without default-features = false somewhere in the dependency tree.

std default = alloc
alloc std
nightly

mut-str has 4 features without comments.