pub fn enable_cfg(name: &str)Expand description
Enables Cargo/rustc feature with the name name.
Allows conditional compilation of code behind #[cfg(name)] or with if cfg!(name) (without
quotes around name).
See set_cfg_value() to set a (name, value) tuple to enable conditional compilation of the
form #[cfg(name = "value")] for cases where name is not a boolean cfg but rather takes any
of several discrete values.
Note the different from #[cfg(feature = "name")]! The configuration is invisible to end users
of your code (i.e. name does not appear anywhere in Cargo.toml) and does not participate in
dependency resolution.