bug#17168: 24.3.50; Segfault at mark_object

[Richard Stallman]

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Thanks for writing a fix.  I think it can be simpler.

You accumulate a list of uninterned symbols whose names are pure.  Why
make this into a hash table and then a vector?  A list should suffice.

Or maybe some (or even all) uninterned symbols with pure string names
should be freed like all other symbols when not pointed to.  That
would be even simpler.

Is there really a need to avoid collecting some of them?

    As an optimization, when we build the final
    vector form of Fpure_reachable, we see whether each item is a symbol
    interned in the initial obarray. If it is, then instead of adding it to
    the vector, we mark the symbol as un-uninternable,

Or unintern could check whether the name is pure.

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Dr Richard Stallman
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