Quest should warn if a verb overrides a built in command

[F2Andy]

If you add a "look" verb to an object, that will override the LOOK command. When you then find you cannot LOOK at anything else, it can be difficult to work out why, and if you are on-line impossible to resolve as verbs cannot be edited or deleted.

http://forum.textadventures.co.uk/viewtopic.php?f=10&t=5979