darcs patch: Fix infinite loop in the TopDown dependency resolver

[Andrea Vezzosi]

Thu Sep 25 20:14:41 CEST 2008  Andrea Vezzosi <sanzhiyan at gmail.com>
  * Fix infinite loop in the TopDown dependency resolver
  The loop occurred only if a package depended on another one
  with the same name, e.g. base-3.0.3.0 <- base-4.0.0.0
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