Cargo Features

[dependencies]
thrift-pool = { version = "1.5.0", default-features = false, features = ["impl-r2d2", "impl-bb8"] }
default = impl-r2d2

The impl-r2d2 feature is set by default whenever thrift-pool is added without default-features = false somewhere in the dependency tree.

impl-r2d2 default = r2d2
impl-bb8 = async-trait, bb8

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.

async-trait impl-bb8?
bb8 impl-bb8?
r2d2 impl-r2d2