Can't handle multi-line pragmas

[toku-sa-n]

Problem

Description of problem here.

• I checked the issue tracker for existing issues about this problem.
• I'm using the latest version of hindent.

Input haskell

{-# LANGUAGE CPP #-}
module Main where
#     define FOO 3+ \
        5

main=undefined

Expected output haskell

{-# LANGUAGE CPP #-}

module Main where

#     define FOO 3+ \
        5

main = undefined

At least, HIndent should not panic.

Actual output haskell: lexical error