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Committer:
Robert Collins
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Date:
2007-09-24 19:34:04 UTC
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mto:
This revision was merged to the branch mainline in
revision
2854.
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Revision ID:
robertc@robertcollins.net-20070924193404-oyg9f9fcfvyr5435
(robertc) Special case the zero-or-no-heads case for Graph.heads(). (Robert Collins)