message: Guarantee pointer initialization.
  This fixes: warning: 'definition_vname' may be used uninitialized in this function [-Wmaybe-uninitialized]
diff: @@ -634,7 +634,7 @@ void KytheFactsExtractor::ExtractMemberReference(
  // Generate reference edge for all the members.
  // e.g pkg::my_class::my_inner_class::static_var.
  - const VName* definition_vname;
  + const VName* definition_vname = nullptr;
  VName reference_anchor;
  for (const auto& anchor :
  verible::make_range(anchors.begin() + 1, anchors.end())) {
  