Cargo Features

[dependencies]
either-future = { version = "1.1.0", default-features = false, features = ["futures01", "futures03", "std_future"] }
default = std_future

The std_future feature is set by default whenever either-future is added without default-features = false somewhere in the dependency tree.

futures01 = futures
futures03 = futures-util
std_future default

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.

futures futures01?

Enables futures ^0.1

futures-util futures03?