how to not specify the type when run eval from library plugins

[zerop2]

*Main> eval "head [1,2,3] :: Int" [] :: IO (Maybe Int)
Just 7
*Main> eval "head [1,2,3]" [] :: IO (Maybe Int)


<eval>:1:7:
No instance for (Num a0) arising from the literal `1'
The type variable `a0' is ambiguous
Possible fix: add a type signature that fixes these type variable(s)
Note: there are several potential instances:
instance Num Double -- Defined in `GHC.Float'
instance Num Float -- Defined in `GHC.Float'
instance Integral a => Num (GHC.Real.Ratio a)
-- Defined in `GHC.Real'
...plus 11 others
In the expression: 1
In the first argument of `head', namely `[1, 2, 3]'
In the expression: head [1, 2, 3]


<eval>:1:19:
No instance for (Typeable a0) arising from a use of `toDyn'
The type variable `a0' is ambiguous
Possible fix: add a type signature that fixes these type variable(s)
Note: there are several potential instances:
instance Typeable Dynamic -- Defined in `Data.Dynamic'
instance [overlap ok] Typeable ()
-- Defined in `Data.Typeable.Internal'
instance [overlap ok] Typeable Bool
-- Defined in `Data.Typeable.Internal'
...plus 19 others
In the expression: toDyn nws
In the expression: let nws = head [...] in toDyn nws
In an equation for `resource':
resource = let nws = head ... in toDyn nws
Nothing

[Vaphell]

i'd risk saying you wont find much haskell help here. Try something like https://www.reddit.com/r/haskell