137/257: gnu: ghc-fgl: Replace "--allow-newer" flags.

[Ricardo Wurmus]

rekado pushed a commit to branch wip-haskell
in repository guix.

commit 94f1d68bc4e2ef325c134c24f3085aacb97bf37b
Author: Timothy Sample <address@hidden>
Date:   Mon Sep 3 21:03:38 2018 -0400

    gnu: ghc-fgl: Replace "--allow-newer" flags.
    
    * gnu/packages/haskell.scm (ghc-fgl)[arguments]: Replace "--allow-newer"
    configure flags with a phase that patches the Cabal file.
---
 gnu/packages/haskell.scm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 9bb81cd..4ddd6dc 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -3525,8 +3525,15 @@ variety of traversals.")
          "1i6cp4b3w7sjk7y1dq3fh6bci2sm5h3lnbbaw9ln19nwncg2wwll"))))
     (build-system haskell-build-system)
     (arguments
-     `(#:configure-flags (list "--allow-newer=QuickCheck"
-                               "--allow-newer=hspec")))
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'update-constraints
+           (lambda _
+             (substitute* "fgl.cabal"
+               (("QuickCheck >= 2\\.8 && < 2\\.10")
+                "QuickCheck >= 2.8 && < 2.12")
+               (("hspec >= 2\\.1 && < 2\\.5")
+                "hspec >= 2.1 && < 2.6")))))))
     (inputs
      `(("ghc-hspec" ,ghc-hspec)
        ("ghc-quickcheck" ,ghc-quickcheck)))