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Once your branch has been integrated upstream, it will be closed automatically.  This is the common case.  Occasionally though, there may be a branch that needs to be abandoned.  This might happen when a branch has been pushed to the submission forest but  failed to integrate upstream.  Let's say you have a branch "JDK-7000001" in the jdk repo repository that needs to be closed.  You could do the following:

$ # From the root of your thelocal forest
$ hg -R jdk update -C "JDK-7000001"
$ hg -R jdk commit --close-branch -m "Abandoning changes."
$ # Update repo to another branch to avoid mistakenly re-opening the closed branch.
$ hg -R jdk update default 

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