rb_remove_event_hook 1172 include/ruby/ruby.h int rb_remove_event_hook(rb_event_hook_func_t func);
rb_remove_event_hook 3496 thread.c           rb_remove_event_hook(0);
rb_remove_event_hook 3547 thread.c           rb_remove_event_hook(call_trace_func);
rb_remove_event_hook 3901 thread.c           rb_remove_event_hook(update_coverage);