Pruning dead branches
If you've got a dead [:Branch:branch] you'd like to eliminate from the list of heads, you can do a 'no-op merge' to remove it:
$ hg update -C tip # jump to one head $ hg merge otherhead # merge in the other head $ hg revert -a -r tip # undo all the changes from the merge $ hg commit -m "eliminate other head" # create new tip identical to the old