error: a function marked with `#[track_caller]` cannot perform a tail-call
  --> $DIR/caller_is_track_caller.rs:6:5
   |
LL |     become b();
   |     ^^^^^^^^^^

error: a function marked with `#[track_caller]` cannot perform a tail-call
  --> $DIR/caller_is_track_caller.rs:13:5
   |
LL |     become a();
   |     ^^^^^^^^^^

error: aborting due to 2 previous errors