message: Specify _ name for function arguments
diff: @@ -201,7 +201,7 @@ pub fn is_isomorphic_matching<N, E, Ty, Ix, F, G>(g0: &Graph<N, E, Ty, Ix>,
  trait SemanticMatcher<T> {
  fn enabled() -> bool;
  - fn eq(&mut self, &T, &T) -> bool;
  + fn eq(&mut self, _: &T, _: &T) -> bool;
  }
  struct NoSemanticMatch;
  