Bug in csh (affecting vi)

[utzoo!decvax!harpo!eagle!mhuxt!mhuxa!mhb5b!smb]

My experience is that the alleged bug in csh (that it prints the prompt
when it shouldn't, thereby affecting file-name expansion from 'vi' and
'ucbmail') isn't a bug; rather, many people unconditionally set 'prompt'
in their .cshrc files.  It should only be set if it's already set to
something:

	if ($?prompt) set prompt='MyPrompt '