E0197 - Error codes index
Description: Book listing all Rust error codes

# Error code E0197

An inherent implementation was marked unsafe.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    struct Foo;

    unsafe impl Foo { } // error!
    }

Inherent implementations (one that do not implement a trait but provide methods associated with a type) are always safe because they are not implementing an unsafe trait. Removing the `unsafe` keyword from the inherent implementation will resolve this error.

    #![allow(unused)]
    fn main() {
    struct Foo;

    impl Foo { } // ok!
    }