[Haskell-cafe] Folded long string literals and CPP?

[Viktor Dukhovni]

On Mon, Nov 20, 2023 at 02:47:39PM -0500, Viktor Dukhovni wrote:

> It looks like there's some sort of syntax conflict between CPP and
> long string literals folded across multiple lines.  Is there a
> way to have both CPP and folded long string literals?
> 

I may have found an acceptable  work-around:

    {-# LANGUAGE CPP #-}
    module Main(main) where

    hello :: String
    hello = "Hello\ \
            \ World!"

    main :: IO ()
    main = print hello

Is this trick "well known"?  CPP turns the above into:

    {-# LANGUAGE CPP #-}
    module Main(main) where

    hello :: String
    hello = "Hello\         \ World!"


    main :: IO ()
    main = print hello

which is then valid Haskell syntax and yields the right value.

-- 
    Viktor.