T3263-1.hs:25:3: warning: [-Wunused-do-bind (in -Wall)]
    A do-notation statement discarded a result of type ‘Int’
    Suppress this warning by saying ‘_ <- nonNullM’

T3263-1.hs:35:3: warning: [-Wunused-do-bind (in -Wall)]
    A do-notation statement discarded a result of type ‘Int’
    Suppress this warning by saying ‘_ <- nonNullM’