@Nullable
        @Override
        public Replacement getReplacementFor(ModuleIdentifier sourceModule) {
            return null;
        }

        @Override
        public boolean participatesInReplacements(ModuleIdentifier moduleId) {
            return false;
        }
    };

    @Nullable Replacement getReplacementFor(ModuleIdentifier sourceModule);

     */
    @Override
    public PotentialConflict registerCandidate(CandidateModule candidate) {
        ModuleReplacementsData.Replacement replacement = moduleReplacements.getReplacementFor(candidate.getId());
        ModuleIdentifier replacedBy = replacement == null ? null : replacement.getTarget();
        return potentialConflict(conflicts.newElement(candidate.getId(), candidate.getVersions(), replacedBy));