Can anyone shed some light on the following error? Thanks in advance.
isSorted :: Ord a => [a] -> Bool
isSorted [] = True
isSorted [x] = True
isSorted (x1:x2:xs)
| x1 <= x2 = isSorted (x2:xs)
| otherwise = False
--------
Hugs session for:
/usr/local/share/hugs/lib/Prelude.hs
haskell/sort.hs
Main> isSorted [1]
True
Main> isSorted [1,2]
True
Main> isSorted [2,1]
False
Main> isSorted []
ERROR: Unresolved overloading
*** Type : Ord a => Bool
*** Expression : isSorted []
--------
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