iterator-with-multiple-container.cpp:28:4: error: [iterator-checker] Potentially invalid iterator used.
  *it = 20;
   ^
iterator-with-multiple-container.cpp:81:4: error: [iterator-checker] Potentially invalid iterator used.
  *it = 20;
   ^
iterator-with-multiple-container.cpp:109:4: error: [iterator-checker] Potentially invalid iterator used.
  *it = 20;
   ^
3 errors generated.