private static boolean isMixinMethod(@NotNull PsiMethod method) {
    if (method instanceof GrGdkMethod) method = ((GrGdkMethod)method).getStaticMethod();
    PsiClass containingClass = method.getContainingClass();
    String name = method.getName();
    return "mixin".equals(name) &&
           containingClass != null &&
           GroovyCommonClassNames.DEFAULT_GROOVY_METHODS.equals(containingClass.getQualifiedName());
  }
private static boolean isMixinMethod(@NotNull PsiMethod method)