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NIL and DEFCONSTANT [Gall: Bug Report]
Maybe a right attitude to take is that it is an error
to execute any compiled code that refers to a DEFCONSTANT'ed
name that has been re-DEFCONSTANT'ed to a different (non-EQL?)
value since the code was compiled.
That would say that it is okay to (DEFCONSTANT T 43), but then
you had better not execute any system code that refers to T.
But the evaluator probably refers to T, so in practice you had
simply better not do it.