error[E0050]: method `come_on_a_little_more_effort` has 0 parameters but the declaration in trait `TooLittle::come_on_a_little_more_effort` has 3 --> $DIR/method-signature-matches.rs:47:5 | LL | fn come_on_a_little_more_effort(_: (), _: (), _: ()) -> impl Sized; | ---------------- trait requires 3 parameters ... LL | fn come_on_a_little_more_effort() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 3 parameters, found 0 error: aborting due to previous error For more information about this error, try `rustc --explain E0050`.