error: `ref` directly on a function argument is ignored. Consider using a reference type instead --> $DIR/toplevel_ref_arg_non_rustfix.rs:9:15 | LL | fn the_answer(ref mut x: u8) { | ^^^^^^^^^ | = note: `-D clippy::toplevel-ref-arg` implied by `-D warnings` error: `ref` directly on a function argument is ignored. Consider using a reference type instead --> $DIR/toplevel_ref_arg_non_rustfix.rs:15:24 | LL | fn fun_example(ref _x: usize) {} | ^^^^^^ ... LL | gen_function!(); | ---------------- in this macro invocation | = note: this error originates in the macro `gen_function` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 2 previous errors