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A private type or trait was used in a public associated type signature.
Erroneous code example:
```compile_fail,E0446
struct Bar;
pub trait PubTr {
type Alias;
}
impl PubTr for u8 {
type Alias = Bar; // error private type in public interface
}
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;
pub(crate) trait PubTr { // only public to crate root
type Alias;
}
impl PubTr for u8 {
type Alias = Bar;
}
fn main() {}
```
The other way to solve this error is to make the private type public.
Example:
```
pub struct Bar; // we set the Bar trait public
pub trait PubTr {
type Alias;
}
impl PubTr for u8 {
type Alias = Bar;
}
fn main() {}
```
|
