Error code E0603

A private item was used outside its scope.

Erroneous code example:

#![allow(unused)] fn main() { mod foo { const PRIVATE: u32 = 0x_a_bad_1dea_u32; // This const is private, so we // can't use it outside of the // `foo` module. } println!("const value: {}", foo::PRIVATE); // error: constant `PRIVATE` // is private }

In order to fix this error, you need to make the item public by using the pub keyword. Example:

#![allow(unused)] fn main() { mod foo { pub const PRIVATE: u32 = 0x_a_bad_1dea_u32; // We set it public by using the // `pub` keyword. } println!("const value: {}", foo::PRIVATE); // ok! }