ppOutputDecl :: OutputDecl -> Doc
ppOutputDecl (OutputDecl mb_range vars)
  = text "output" <+> mb ppRange mb_range <+> ppIdents vars <> semi
ppOutputDecl :: OutputDecl -> Doc
ppOutputDecl (OutputDecl mb_range vars)
  = text "output" <+> mb ppRange mb_range <+> ppIdents vars <> semi
ppOutputDecl (OutputDecl mb_range vars)
  = text "output" <+> mb ppRange mb_range <+> ppIdents vars <> semi