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A private type was used in a public type signature.
Erroneous code example:
```compile_fail,E0446
#![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() {}
```
There 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() {}
```
The 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() {}
```
|
