Can't handle CPP pragmas with spaces

[toku-sa-n]

Problem

Description of problem here.

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

Input haskell

{-# LANGUAGE CPP #-}

#      if          0
#   endif

Expected output haskell

{-# LANGUAGE CPP #-}

#if 0
#endif

Actual: parse error