{-# LANGUAGE OverloadedStrings #-}
module Check where
import Data.String (IsString(fromString))
data Val = HInt Integer | HStr String | HList [Val]
instance IsString Val where
    fromString = HStr
instance Num Val where
    fromInteger = HInt
    a + b = error "not implemented"
    a * b = error "not implemented"
    abs a = error "not implemented"
    signum a = error "not implemented"
    negate (HInt n) = HInt (negate n)
    negate _ = error "not implemented"
my_data :: Val
my_data = HList [
    HList [HList [1, 2], HList ["a", "b"]]
    ]
