[m-rev.] private_builtin.m improvements & purity warning bugfix

[Simon Taylor]

On 13-Dec-2001, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> > There should also be a test case.
> 
> Code which exercises this bug is in library/private_builtin.m
> after my change.  Do we really need a separate test case?

It's usually a good idea. Code in the library can be removed or
changed so it no longer exercises the bug.

Simon.
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