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From: RJF@MIT-MC
Date: Thu, 25 Jan 80 23:58:25 GMT
Original-Date: 01/25/80 19:58:25 EDT
Subject:
?comexp(f(sin(x))+sin(x));  gives
;seen non-null terminatin of list - map
iocerror  - chnl not open

Whereas what RJF is doing here in MACSYMA is not legal, 
it is not nice that LISP succeeds in giving the correct error message
and then proceeds to clobber itself.  It exits to DDT, etc.
(The MAPC is in compiled code, compiled with MAPEX NIL.)