inter-container-iterator-comparison.cpp:25:7: error: [iterator-checker] Potentially invalid iterator comparison.
  if (it1 == it2) {
      ^
inter-container-iterator-comparison.cpp:36:7: error: [iterator-checker] Potentially invalid iterator comparison.
  if (v1.begin() != v2.end()) {
      ^
inter-container-iterator-comparison.cpp:41:7: error: [iterator-checker] Potentially invalid iterator comparison.
  if (it != v2.end()) {
      ^
3 errors generated.