error: ref_cast_custom function is required to have a single argument --> tests/ui/extra-arg.rs:9:33 | 9 | pub fn ref_cast(s: &String, wat: i32) -> &Self; | ^^^^^^^^ error: associated function in `impl` without body --> tests/ui/extra-arg.rs:9:5 | 9 | pub fn ref_cast(s: &String, wat: i32) -> &Self; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- | | | help: provide a definition for the function: `{ }`