invalidate-all-iterators.cpp:20:4: error: [iterator-checker] Potentially invalid iterator used.
  *it1 = 1;
   ^
invalidate-all-iterators.cpp:21:4: error: [iterator-checker] Potentially invalid iterator used.
  *it2 = 2;
   ^
invalidate-all-iterators.cpp:22:4: error: [iterator-checker] Potentially invalid iterator used.
  *it3 = 3;
   ^
3 errors generated.