Features from optional dependencies

either implicit feature

Enables either

either:

The enum Either with variants Left and Right is a general purpose sum type with two cases

Affects nonempty-collections::either

indexmap implicit feature

Enables indexmap

indexmap:

A hash table with consistent order and fast iteration

Affects nonempty-collections::index_map

itertools implicit feature

Enables itertools

itertools:

Extra iterator adaptors, iterator methods, free functions, and macros

Affects nonempty-collections::itertools

serde implicit feature

Enables serde

serde:

A generic serialization/deserialization framework