Error code E0424

The self keyword was used inside of an associated function without a "self receiver" parameter.

Erroneous code example:

#![allow(unused)] fn main() { struct Foo; impl Foo { // `bar` is a method, because it has a receiver parameter. fn bar(&self) {} // `foo` is not a method, because it has no receiver parameter. fn foo() { self.bar(); // error: `self` value is a keyword only available in // methods with a `self` parameter } } }

The self keyword can only be used inside methods, which are associated functions (functions defined inside of a trait or impl block) that have a self receiver as its first parameter, like self, &self, &mut self or self: &mut Pin<Self> (this last one is an example of an "arbitrary self type").

Check if the associated function's parameter list should have contained a self receiver for it to be a method, and add it if so. Example:

#![allow(unused)] fn main() { struct Foo; impl Foo { fn bar(&self) {} fn foo(self) { // `foo` is now a method. self.bar(); // ok! } } }