Cargo Features

[dependencies]
qrcode = { version = "0.14.0", default-features = false, features = ["svg", "bench", "image"] }
default = image, svg

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

svg default
bench

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.

image default