[m-rev.] for review: fix relation.m performance bugs

[Simon Taylor]

On 19-Dec-2003, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> On 19-Dec-2003, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> > 
> > Fix performance bugs in library/relation.m which caused
> > `mmc --generate-dependencies' to choke on large programs
> > (e.g. the compiler).
> > 
> > `mmc --generate-dependencies top_level' now takes
> > about 8 seconds on jupiter, compared to over 2 minutes
> > before.

Actually, I was wrong; it took about 65 seconds before.

Simon.
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