[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Date: Wednesday, 22 May 1985, 10:56-EDT
From: Guy Steele <gls%AQUINAS@THINK.ARPA>
By the way, ',@x is not always an error! It does make sense if x is
exactly a singleton list. Sometimes this is useful in obscure cases.
Similarly, ,@',,@x makes sense if x is a singleton list. See the end of
I think "is an error" is still the right phrase to apply.
Just because there happens to be a value that does not result
in an error does not make it proper. I think it is *MUCH*
clearer to write ',(CAR X). You can do additional error
checking on X if you like, and signal a comprehensible
error, rather than depending on QUOTE to check! (I have
seen implementations where QUOTE did not check).