[m-rev.] for review: more switches in lexer.m

[Julien Fischer]

On Mon, 2 Jun 2008, Zoltan Somogyi wrote:

> For review by anyone.
>
> Zoltan.
>
> library/lexer.m:
> 	Convert a couple more if-then-else chains into switches. This one
> 	gains 0.2% in speed.

That looks fine.

Julien.
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