A private type was used in a public type signature.
Erroneous code example:
#![deny(private_in_public)]
struct Bar(u32);
mod foo {
use crate::Bar;
pub fn bar() -> Bar { // error: private type in public interface
Bar(0)
}
}
fn main() {}
RunThere are two ways to solve this error. The first is to make the public type signature only public to a module that also has access to the private type. This is done by using pub(crate) or pub(in crate::my_mod::etc) Example:
struct Bar(u32);
mod foo {
use crate::Bar;
pub(crate) fn bar() -> Bar { // only public to crate root
Bar(0)
}
}
fn main() {}
RunThe other way to solve this error is to make the private type public. Example:
pub struct Bar(u32); // we set the Bar type public
mod foo {
use crate::Bar;
pub fn bar() -> Bar { // ok!
Bar(0)
}
}
fn main() {}
Run