>>> compose (del 1) (ins 1:: Change)
splitDeltaIn: Change (fromList [Edit 0 1 0]) 0
splitDeltaOut: (Change (fromList [Edit 0 1 0]) 0,Change (fromList []) 0)
editEdit: Edit 0 0 1
editSplitIn: Change (fromList [Edit 0 1 0]) 0
editSplitOut: (Change (fromList []) 0,Change (fromList [Edit 0 1 0]) 0)
*** Exception: changePos: Past end
CallStack (from HasCallStack):
  error, called at ./Coda/Syntax/Change.hs:127:18 in coda-change-0.0.1-inplace:Coda.Syntax.Change