}

        private <T> Set<T> concat(Set<T> set, T elem) {
            Set<T> newSet = new HashSet<>(set);
            newSet.add(elem);
            return newSet;
        }

        @SuppressWarnings("checkstyle:parameternumber")
        private InterimResult build(
                Map<File, MavenProject> projectIndex,
                File pomFile,
                Set<File> aggregatorFiles,

                    field.setAccessible(true);
                    field.set(v4src, ModelProblemUtils.toId(model));
                } catch (Throwable t) {
                    // TODO: use a lazy source ?
                    throw new IllegalStateException("Unable to set modelId on InputSource", t);
                }
            }
        } catch (XmlReaderException e) {

            } finally {
                stk.pop();
            }
        }
    }

    private final Set<String> validCoordinateIds = new HashSet<>();

    private final Set<String> validProfileIds = new HashSet<>();

    private final ModelVersionProcessor versionProcessor;

    @Inject