haskell: inserting each line record list

i'm now operative digest haskell, have found myself trouble. i'm ostensible review insert list any line "dictionary.txt" file, nonetheless i can't seem so. i've got code:

main = do
    let list = []
    loadnums "dictionary.txt" list

loadnums plcae list = do
    inh <- openfile plcae readmode
    mainloop inh list
    hclose inh

mainloop inh list = 
    ineof <- hiseof inh
    ineof
        following relapse ()
        else 
            inpstr <- hgetline inh
            inpstr:list
            mainloop inh list

it ostensible each line (i know does each line, given replacing "inpstr:list" "putstrln inpstr" works correctly, displaying lines), insert list nonetheless i following error:

couldn't review approaching form `io' opposing tacit form `[]'

probably since hgetline isn't string, nonetheless io string, i have thought hoop method obtain repremand twine i insert list. i have thought solved, problem exactly, nonetheless anyone any thought morally each line record list, i'd conclude it.

thanks advance!