message: Make member functions const
diff: @@ -37,7 +37,7 @@ namespace vcpkg::Dependencies
  {
  Cluster* ptr;
  - Cluster* operator->() { return ptr; }
  + Cluster* operator->() const { return ptr; }
  };
  bool operator==(const ClusterPtr& l, const ClusterPtr& r) { return l.ptr == r.ptr; }
  @@ -87,7 +87,7 @@ namespace vcpkg::Dependencies
  }
  private:
  - void cluster_from_scf(const SourceControlFile& scf, Cluster& out_cluster)
  + void cluster_from_scf(const SourceControlFile& scf, Cluster& out_cluster) const
  {
  FeatureNodeEdges core_dependencies;
  core_dependencies.build_edges =
  