```compile_fail,E0446
#![deny(private_in_public)]
+struct Bar(u32);
-mod Foo {
- struct Bar(u32);
-
+mod foo {
+ use crate::Bar;
pub fn bar() -> Bar { // error: private type in public interface
Bar(0)
}
fn main() {}
```
-To solve this error, please ensure that the type is also public. The type
-can be made inaccessible if necessary by placing it into a private inner
-module, but it still has to be marked with `pub`.
+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:
```
-mod Foo {
- pub struct Bar(u32); // we set the Bar type public
+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)
}