When to creat PURE symbols (sy2blks)

[HIC at MIT-MC (Howard I. Cannon)]

    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.
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Implimented for next release of LISP (se note re macsyma)