Test: iterator_invalidation.cpp
iterator_invalidation.cpp:1:1: error: expected unqualified-id before 'for'
    1 | for (auto it = events_.begin(); it != events_.end(); ) {
      | ^~~
iterator_invalidation.cpp:1:33: error: 'it' does not name a type; did you mean 'int'?
    1 | for (auto it = events_.begin(); it != events_.end(); ) {
      |                                 ^~
      |                                 int
iterator_invalidation.cpp:1:54: error: expected unqualified-id before ')' token
    1 | for (auto it = events_.begin(); it != events_.end(); ) {
      |                                                      ^