xmonad-contrib

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Sergei Trofimovich a681e68602 XMonad/Layout/Groups/Helpers.hs: drop broken ImpredicativeTypes extension (fixes #123 )

ImpredicativeTypes is practically unsupported extension
on it's way to be removed from GHC:
    https://mail.haskell.org/pipermail/ghc-devs/2016-September/012826.html

GHC-8.0.2-rc1 already fails to build xmonad-contrib as:

  XMonad/Layout/Groups/Helpers.hs:181:22: error:
    • Couldn't match type ‘G.WithID l0 Window
                           -> XMonad.Util.Stack.Zipper (G.Group l0 Window)
                           -> XMonad.Util.Stack.Zipper (G.Group l0 Window)’
                     with ‘G.ModifySpec’
      Expected type: (G.WithID l0 Window
                      -> XMonad.Util.Stack.Zipper (G.Group l0 Window)
                      -> XMonad.Util.Stack.Zipper (G.Group l0 Window))
                     -> G.GroupsMessage
        Actual type: G.ModifySpec -> G.GroupsMessage
    • In the second argument of ‘(.)’, namely ‘G.Modify’
      In the expression: sendMessage . G.Modify
      In an equation for ‘wrap’: wrap = sendMessage . G.Modify

The workaround is simple: add explicit types to applications
or open-code direct application (this change).

Bug: https://github.com/xmonad/xmonad-contrib/issues/123
Signed-off-by: Sergei Trofimovich <siarheit@google.com>

2016-11-27 10:03:17 +00:00