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$ ghci GHCi, version 8.10.7: https://www.haskell.org/ghc/ :? for help Prelude _> import Control.Monad.Identity Prelude Control.Monad.Identity _> liftM2 (||) (pure True) undefined :: Identity Bool Identity True Prelude Control.Monad.Identity _> liftM2 (||) (pure True) undefined :: IO Bool *** Exception: Prelude.undefined CallStack (from HasCallStack): error, called at libraries/base/GHC/Err.hs:79:14 in base:GHC.Err undefined, called at :5:25 in interactive:Ghci2