[Haskell-beginners] typeOf raises Error

[Frank Schwidom]

Hi,

if im calling (on the console)

"typeOf 1"

after importing Data.Typeable, i will gain 

"Integer", as i expected, but if i do so in code which is 
to compile, then there raises an error

------------
import Data.Typeable

main=
 print (typeOf 1)
------------

$ ghc -c DT.hs 

$ ghc -c DT.hs 

DT.hs:4:15:
    Ambiguous type variable `t' in the constraints:
      `Num t' arising from the literal `1' at DT.hs:4:15
      `Typeable t' arising from a use of `typeOf' at DT.hs:4:8-15
    Probable fix: add a type signature that fixes these type variable(s)

what can i do, to solve this problem?

Regards