Map<String, List<InputLocation>> metaVersionLocations = new HashMap<>();
        for (CoreExtension coreExtension : coreExtensions) {
            String ga = coreExtension.getGroupId() + ":" + coreExtension.getArtifactId();
            InputLocation location = coreExtension.getLocation("");
            gasLocations.computeIfAbsent(ga, k -> new ArrayList<>()).add(location);

                        .count()
                > 1;

        if (hasOverlappingArtifactId) {
            return firstFailedProject.getGroupId() + ":" + firstFailedProject.getArtifactId();
        }

        return ":" + firstFailedProject.getArtifactId();
    }

    protected static final Pattern NEXT_LINE = Pattern.compile("\r?\n");

        Map<String, List<File>> collisions = new LinkedHashMap<>();

        for (MavenProject project : projects) {
            String projectId = ArtifactUtils.key(project.getGroupId(), project.getArtifactId(), project.getVersion());

            MavenProject collision = index.get(projectId);

            if (collision == null) {
                index.put(projectId, project);

                        .count()
                > 1;

        if (hasOverlappingArtifactId) {
            return firstFailedProject.getGroupId() + ":" + firstFailedProject.getArtifactId();
        }

        return ":" + firstFailedProject.getArtifactId();
    }

    private void logSummary(