Cargo Features

[dependencies]
calc_mjp = { version = "1.1.0", default-features = false, features = ["all", "calc", "say"] }
default = calc

The calc feature is set by default whenever calc_mjp is added without default-features = false somewhere in the dependency tree.

all = calc, say
calc default all?

Affects calc_mjp::add, calc_mjp::minus

say all?

Affects calc_mjp::say_hello