rb_remove_event_hook   56 include/ruby/debug.h int rb_remove_event_hook(rb_event_hook_func_t func);
rb_remove_event_hook 2108 include/ruby/ruby.h int rb_remove_event_hook(rb_event_hook_func_t func);
rb_remove_event_hook 4975 thread.c           rb_remove_event_hook(update_coverage);
rb_remove_event_hook  222 vm_trace.c         rb_remove_event_hook(0);
rb_remove_event_hook  493 vm_trace.c         rb_remove_event_hook(call_trace_func);