/**
     * Collects the output of the toolchains builder.
     *
     */
    static class DefaultToolchainsBuilderResult implements ToolchainsBuilderResult {

        private final PersistedToolchains effectiveToolchains;

        private final List<BuilderProblem> problems;

        DefaultToolchainsBuilderResult(PersistedToolchains effectiveToolchains, List<BuilderProblem> problems) {