Cargo Features

[dependencies]
guuid = { version = "1.0.0", default-features = false, features = ["no_std", "std", "alloc"] }
default = std

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

no_std
std default = base32, rand
alloc = base32

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.

rand std
base32 alloc? std