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-rw-r--r--gnu/local.mk3
-rw-r--r--gnu/packages/haskell-xyz.scm1
-rw-r--r--gnu/packages/patches/ghc-monad-par-fix-tests.patch45
3 files changed, 48 insertions, 1 deletions
diff --git a/gnu/local.mk b/gnu/local.mk
index a9548d4bd6..c6f0dfdb46 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -880,7 +880,8 @@ dist_patch_DATA = \
%D%/packages/patches/ghc-8.0-fall-back-to-madv_dontneed.patch \
%D%/packages/patches/ghc-diff-swap-cover-args.patch \
%D%/packages/patches/ghc-dont-pass-linker-flags-via-response-files.patch \
- %D%/packages/patches/ghc-haddock-library-unbundle.patch \
+ %D%/packages/patches/ghc-haddock-library-unbundle.patch \
+ %D%/packages/patches/ghc-monad-par-fix-tests.patch \
%D%/packages/patches/ghostscript-no-header-id.patch \
%D%/packages/patches/ghostscript-no-header-uuid.patch \
%D%/packages/patches/ghostscript-no-header-creationdate.patch \
diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index 30d9098e1f..604c2deaa9 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -6541,6 +6541,7 @@ operators for looping.")
(uri (string-append "https://hackage.haskell.org/package/"
"monad-par-" version "/"
"monad-par-" version ".tar.gz"))
+ (patches (search-patches "ghc-monad-par-fix-tests.patch"))
(sha256
(base32
"0ldrzqy24fsszvn2a2nr77m2ih7xm0h9bgkjyv1l274aj18xyk7q"))))
diff --git a/gnu/packages/patches/ghc-monad-par-fix-tests.patch b/gnu/packages/patches/ghc-monad-par-fix-tests.patch
new file mode 100644
index 0000000000..d21a1e485c
--- /dev/null
+++ b/gnu/packages/patches/ghc-monad-par-fix-tests.patch
@@ -0,0 +1,45 @@
+This patch is taken from upstream. It fixes a test to work with GHC 8.6.
+The paths have been slightly altered to work with the release tarball.
+
+See <https://github.com/simonmar/monad-par/issues/66>.
+
+From e20f81c8060208e4fb038e8f0e0668b41d72a6fb Mon Sep 17 00:00:00 2001
+From: Clint Adams <clint@debian.org>
+Date: Sat, 31 Aug 2019 14:12:34 -0400
+Subject: [PATCH] Use a case statement instead of pattern-matching in
+ case_test_diamond
+
+This avoids the need for a MonadFail instance. Closes #66
+---
+ monad-par/tests/ParTests_shared.hs | 15 +++++++++------
+ 1 file changed, 9 insertions(+), 6 deletions(-)
+
+diff --git a/tests/ParTests_shared.hs b/tests/ParTests_shared.hs
+index 31f438d..b2de50c 100644
+--- a/tests/ParTests_shared.hs
++++ b/tests/ParTests_shared.hs
+@@ -109,12 +109,15 @@ case_test_diamond :: Assertion
+ case_test_diamond = 9 @=? (m :: Int)
+ where
+ m = runPar $ do
+- [a,b,c,d] <- sequence [new,new,new,new]
+- fork $ do x <- get a; put b (x+1)
+- fork $ do x <- get a; put c (x+2)
+- fork $ do x <- get b; y <- get c; put d (x+y)
+- fork $ do put a 3
+- get d
++ abcd <- sequence [new,new,new,new]
++ case abcd of
++ [a,b,c,d] -> do
++ fork $ do x <- get a; put b (x+1)
++ fork $ do x <- get a; put c (x+2)
++ fork $ do x <- get b; y <- get c; put d (x+y)
++ fork $ do put a 3
++ get d
++ _ -> error "Oops"
+
+ -- | Violate IVar single-assignment:
+ --
+--
+2.23.0
+