gistfile1.txt

Prelude> x
[]
Prelude> y
[]
Prelude> x == y

<interactive>:54:1:
    No instance for (Num [t0]) arising from a use of ‘x’
    In the first argument of ‘(==)’, namely ‘x’
    In the expression: x == y
    In an equation for ‘it’: it = x == y

<interactive>:54:3:
    No instance for (Eq t0) arising from a use of ‘==’
    The type variable ‘t0’ is ambiguous
    Note: there are several potential instances:
      instance Eq a => Eq (GHC.Real.Ratio a) -- Defined in ‘GHC.Real’
      instance Eq a => Eq (Control.Applicative.ZipList a)
        -- Defined in ‘Control.Applicative’
      instance Eq Integer -- Defined in ‘integer-gmp:GHC.Integer.Type’
      ...plus 24 others
    In the expression: x == y
    In an equation for ‘it’: it = x == y

<interactive>:54:6:
    No instance for (Num t0) arising from a use of ‘y’
    The type variable ‘t0’ is ambiguous
    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 three others
    In the second argument of ‘(==)’, namely ‘y’
    In the expression: x == y
    In an equation for ‘it’: it = x == y