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Fix r15779 and generalise. Also implement
authorChristoph Mallon <christoph.mallon@gmx.de>
Thu, 13 Sep 2007 13:22:04 +0000 (13:22 +0000)
committerChristoph Mallon <christoph.mallon@gmx.de>
Thu, 13 Sep 2007 13:22:04 +0000 (13:22 +0000)
- -a - b -> -(a + b)
- a - -b -> a + b

[r15781]


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