Cargo Features

[dependencies]
swf = { version = "0.2.2", default-features = false, features = ["lzma", "flate2"] }
default = flate2, lzma

These default features are set whenever swf is added without default-features = false somewhere in the dependency tree.

lzma default = lzma-rs

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.

flate2 default
lzma-rs lzma