Cargo Features

[dependencies]
actix = { version = "0.13.5", default-features = false, features = ["macros", "mailbox_assert"] }
default = macros

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

macros default = actix-macros, actix_derive

Re-exports derive macros from actix-derive and enables #[actix::main].

mailbox_assert

Adds assertion to prevent processing too many messages on event loop

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.

actix-macros macros
actix_derive macros