return toolchains.stream().filter(t -> !isValidToolchain(t)).collect(Collectors.toList());
    }

    private static List<JvmToolchainMetadata> validToolchains(Collection<JvmToolchainMetadata> toolchains) {
        return toolchains.stream().filter(ShowToolchainsTask::isValidToolchain).sorted(TOOLCHAIN_COMPARATOR).collect(Collectors.toList());
    }

    private static boolean isValidToolchain(JvmToolchainMetadata t) {