mod134.hs:6:19: error:
    Not in scope: ‘Prelude.head’
    Suggested fixes:
      • Perhaps use one of these:
          ‘Prelude.read’ (imported from Prelude),
          ‘Prelude.reads’ (imported from Prelude),
          ‘Prelude.id’ (imported from Prelude)
      • Perhaps you want to remove ‘head’ from the explicit hiding list
        in the import of ‘Prelude’ (mod134.hs:4:1-28).