Cannot parse LANGUAGE pragma [GHC-68686]

The LANGUAGE pragma expects a comma separated list of existing language extension. Each start with a capital letter.

Examples

Invalid LANGUAGE pragma

Error Message

    Cannot parse LANGUAGE pragma
    Expecting comma-separated list of language options,
    each starting with a capital letter
      E.g. {-# LANGUAGE TemplateHaskell, GADTs #-}

Main.hs

Before

{-# LANGUAGE GADTs TemplateHaskell #-}

module Main where

main = print "Please look at the LANGUAGE pragmas!"

After

{-# LANGUAGE GADTs, TemplateHaskell #-}

module Main where

main = print "Please look at the LANGUAGE pragmas!"