Cargo Features

[dependencies]
mem_println = { version = "0.1.5", default-features = false, features = ["println_mem", "get_size_of_val"] }
default = get_size_of_val, println_mem

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

println_mem default
get_size_of_val default

mem_println has 3 features without comments.