Cargo Features

struct_db has no features set by default.

[dependencies]
struct_db = { version = "0.4.6", features = ["async_tokio"] }
async_tokio = tokio

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.

tokio async_tokio?

Enables tokio

Optional tokio support

Affects watch::MpscSender, watch::MpscReceiver