Force pre-computation of a constant

Question

I have a constant declaration in Haskell -- can I force this to be evaluated ahead of time? I\'m seeing some code that looks roughly like,

myList = [(a, b), (c,          


        

Answer 1

Generating a compile-time constant using Template Haskell:

{-# LANGUAGE TemplateHaskell #-}
import Language.Haskell.TH.Syntax(Lift(..))

test = $(lift $ (map (*20) [0..100] :: [Int]))

lift takes a Haskell value and lifts it into a TH Exp. The $() runs the enclosed quote, and splices the generated exp into the code at compile time.