Cargo Features
async_io_stream has no features set by default.
[dependencies]
async_io_stream = { version = "0.3.3", features = ["map_pharos", "tokio_io"] }
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](https://rust-lang.github.io/rfcs/3491-remove-implicit-features.html).