An associated function for a trait was defined to be a method (i.e., to take a
self parameter), but an implementation of the trait declared the same function
to be static.
Erroneous code example:
trait Foo {
fn foo(&self);
}
struct Bar;
impl Foo for Bar {
// error, method `foo` has a `&self` declaration in the trait, but not in
// the impl
fn foo() {}
}When a type implements a trait’s associated function, it has to use the same
signature. So in this case, since Foo::foo takes self as argument and
does not return anything, its implementation on Bar should be the same:
trait Foo {
fn foo(&self);
}
struct Bar;
impl Foo for Bar {
fn foo(&self) {} // ok!
}