ruby_error_closed_stream   97 thread.c       #define closed_stream_error GET_VM()->special_exceptions[ruby_error_closed_stream]
ruby_error_closed_stream 2171 thread.c       	    VALUE err = th->vm->special_exceptions[ruby_error_closed_stream];
ruby_error_closed_stream 4801 thread.c           rb_vm_register_special_exception(ruby_error_closed_stream, rb_eIOError, "stream closed");