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NIL and DEFCONSTANT [Gall: Bug Report]
I agree with Moon that it "is an error" to redefine built-in constants.
It probably is not required that an implementation stop you from doing
this, but it would be a good idea.
I think that the description on page 56 is OK as it is. First it says
that there are built-in named constants that you don't get to change.
Here it talks about such things as T and NIL. Then it says that
"constant symbols defined by Defconstant" are also treated this way, but
that they may be redefined if necessary by using Defconstant again. I
don't see anything that would imply that T and NIL are implicitly
defined by Defconstant and that they are therefore redefinable.