We now throw errors when trying to delete frozen definitions.
Scenario: press C-d, try to delete on which most apps have.
Before this commit the delete would go through, and the app would be
irrevocably broken.
DTD5IPV57A3Q7MSJ3Y7C4G6HG366WHVUWUBSWWNQZFNIS7DTSAHAC while true dolocal response_string = live.receive_from_app()if Load_time_error then-- no buffer, so show error at bottom of windowRun_time_error = Load_time_errorLoad_time_error = nilbreakendif live.receive_run_time_error_from_app() thenbreakendlove.timer.sleep(0.001)end