That is, instead of `I use the function \texttt{liftM2} to lift ...`, use `I use the function \hoogle{liftM2} to lift ...`.
What the command does is not only format the function name in a fixed-width font using `\texttt`, but also link it to a Hoogle-search, to allow the reader to easily look up what the function does, in case it’s unknown to them.