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! }