return;
        }
        try {
            build.ensureProjectsConfigured();
            makeSubstitutionsAvailableFor(build, new HashSet<>());
        } finally {
            registering.remove(build);
        }
    }

    private void makeSubstitutionsAvailableFor(BuildState build, Set<BuildState> seen) {
        // A build can see all the builds that it includes
        if (!seen.add(build)) {