better support concurrent fetch of package
- other dub might have already released the lock
  leading to another (failing) fetch of a package
1 parent cdf2753 commit e4cd8f5646502356916eaa42e0b1d93010575c8b
@Martin Nowak Martin Nowak authored on 3 Oct 2015
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source/dub/dub.d
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test/issue674-concurrent-dub.sh