@Nullable
  private static GrParameter getAppropriateParameter(final PsiElement element) {
    if (element instanceof GrParameter) {
      return (GrParameter)element;
    }
    if (element instanceof GrReferenceExpression expr) {
      final PsiElement resolved = expr.resolve();
      LOG.assertTrue(resolved instanceof GrParameter);
      return ((GrParameter)resolved);
    }
    LOG.error("Selected expression is not resolved to method/closure parameter");
    return null;
  }
@Nullable
  private static GrParameter getAppropriateParameter(final PsiElement element)