# Error code E0445

A private trait was used on a public type parameter bound.

Erroneous code examples:

    #![deny(private_in_public)]

    trait Foo {
        fn dummy(&self) { }
    }

    pub trait Bar : Foo {} // error: private trait in public interface
    pub struct Bar2<T: Foo>(pub T); // same error
    pub fn foo<T: Foo> (t: T) {} // same error

    fn main() {}

To solve this error, please ensure that the trait is also public. The trait can be made inaccessible if necessary by placing it into a private inner module, but it still has to be marked with `pub`. Example:

    pub trait Foo { // we set the Foo trait public
        fn dummy(&self) { }
    }

    pub trait Bar : Foo {} // ok!
    pub struct Bar2<T: Foo>(pub T); // ok!
    pub fn foo<T: Foo> (t: T) {} // ok!

    fn main() {}