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When to creat PURE symbols (sy2blks)

    Date: 13 MAY 1978 0304-EDT
    From: JONL at MIT-MC (Jon L White)
    Subject: When to creat PURE symbols (sy2blks)
    To: (BUG LISP) at MIT-MC

    Any symbol created by RINTERNing, such as thru READ and FASLOAD
    (of course, assuming *PURE = T), and thru PURECOPY, and at no
    other times.  Thus the current usage on PNGNK1, PNGNK2 etc by
    GENSYM, MAKNAM, READLINE, and COPYSYMBOL will never directly
    create symbols with pure structure.
Implimented for next release of LISP (se note re macsyma)