On 2018-01-17 06:46 PM, Andrew Martin wrote: > Required background information: > https://ghc.haskell.org/trac/ghc/ticket/14673 +1 for Only, because it's short and already in use. It's also used by my own libraries (https://hackage.haskell.org/package/rank2classes-1.0.1/docs/Rank2.html#t:Only), so I wouldn't need to rename it. Selfish I know.