visibility

Who is allowed to use an item: only its own module, the whole crate, or anyone.

Items are private to their module by default; pub makes them visible wherever their parent is, pub(crate) within the crate, pub(super) in the parent module, and pub(in path) in a named ancestor.

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Examples

If pub struct Setpoint { celsius: f32 } keeps celsius private, code outside its module can call Setpoint::new(21.0) but writing Setpoint { celsius: 21.0 } fails with E0451.