gnu: ghc-hpack: Update to 0.31.2.

* gnu/packages/haskell-xyz.scm (ghc-hpack): Update to 0.31.2.
[source]: Use a patch to fix tests.
[inputs]: Add 'ghc-infer-license'.
* gnu/packages/patches/ghc-hpack-fix-tests.patch: New file.
* gnu/local.mk: Add it.

gnu/local.mk

@@ -881,6 +881,7 @@ dist_patch_DATA =						\
   %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-hpack-fix-tests.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		\

gnu/packages/haskell-xyz.scm

@@ -4953,15 +4953,16 @@ (define-public ghc-hourglass
 (define-public ghc-hpack
   (package
     (name "ghc-hpack")
-    (version "0.28.2")
+    (version "0.31.2")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://hackage.haskell.org/package/hpack/"
                            "hpack-" version ".tar.gz"))
+       (patches (search-patches "ghc-hpack-fix-tests.patch"))
        (sha256
         (base32
-         "18w0h76jdp3mk9vin8da9iz3cwhcxmw787xy8wlh8bxcpcr16q5r"))))
+         "1l2d6185lawwhsj70swxkvcacm0hvcn9qsrlx4ph4gs6k578603g"))))
     (build-system haskell-build-system)
     (inputs
      `(("ghc-aeson" ,ghc-aeson)
@@ -4971,6 +4972,7 @@ (define-public ghc-hpack
        ("ghc-http-client" ,ghc-http-client)
        ("ghc-http-client-tls" ,ghc-http-client-tls)
        ("ghc-http-types" ,ghc-http-types)
+       ("ghc-infer-license" ,ghc-infer-license)
        ("ghc-scientific" ,ghc-scientific)
        ("ghc-unordered-containers" ,ghc-unordered-containers)
        ("ghc-vector" ,ghc-vector)

gnu/packages/patches/ghc-hpack-fix-tests.patch

@@ -0,0 +1,193 @@
+This patch is taken and adapted from upstream.  It landed shortly after
+the release of 0.31.2, and fixes eleven tests.  The patch has been
+lightly adapted to apply to the release tarball, but the commit message
+was left untouched, so it refers to some changes not included in the
+patch.
+
+From a8d9362d4b686074f698c04c20beea88587511a1 Mon Sep 17 00:00:00 2001
+From: quasicomputational <quasicomputational@gmail.com>
+Date: Sat, 1 Jun 2019 15:11:31 +0100
+Subject: [PATCH] Make CI green (#345)
+
+* AppVeyor workaround for TMP issue
+
+https://github.com/commercialhaskell/stack/issues/3944
+
+* Bump resolver to nightly-2018-12-12.
+
+This has the primary benefit of moving to GHC 8.6.3 and should fix
+AppVeyor.
+
+* Add clock 0.8 as an extra-dep.
+
+* Adapt expected output to aeson 1.4.3.0.
+---
+ appveyor.yml                            |  3 +++
+ hpack.cabal                             | 10 +++++-----
+ package.yaml                            |  2 +-
+ stack.yaml                              |  5 +++--
+ test/Data/Aeson/Config/FromValueSpec.hs |  2 +-
+ test/Data/Aeson/Config/TypesSpec.hs     |  2 +-
+ test/EndToEndSpec.hs                    |  8 ++++----
+ test/Hpack/ConfigSpec.hs                |  2 +-
+ test/Hpack/Syntax/DefaultsSpec.hs       |  2 +-
+ test/Hpack/Syntax/DependenciesSpec.hs   |  4 ++--
+ 10 files changed, 22 insertions(+), 18 deletions(-)
+
+diff --git a/hpack.cabal b/hpack.cabal
+index fedb9a8..4db3014 100644
+--- a/hpack.cabal
++++ b/hpack.cabal
+@@ -1,10 +1,10 @@
+ cabal-version: 1.12
+ 
+--- This file has been generated from package.yaml by hpack version 0.31.0.
++-- This file has been generated from package.yaml by hpack version 0.31.2.
+ --
+ -- see: https://github.com/sol/hpack
+ --
+--- hash: 3d060180293c32b8d0c25b710d0f419e96a6cc6ec3f95ac5e70bb77f44cbafc3
++-- hash: bd5dd178c7e9f7f7a3456d79b592ea336c41ef43c9892354c001f06659e8b901
+ 
+ name:           hpack
+ version:        0.31.2
+@@ -31,7 +31,7 @@ library
+   build-depends:
+       Cabal >=2.2
+     , Glob >=0.9.0
+-    , aeson >=1.2.1.0
++    , aeson >=1.4.3.0
+     , base >=4.9 && <5
+     , bifunctors
+     , bytestring
+@@ -87,7 +87,7 @@ executable hpack
+   build-depends:
+       Cabal >=2.2
+     , Glob >=0.9.0
+-    , aeson >=1.2.1.0
++    , aeson >=1.4.3.0
+     , base >=4.9 && <5
+     , bifunctors
+     , bytestring
+@@ -125,7 +125,7 @@ test-suite spec
+     , Glob >=0.9.0
+     , HUnit >=1.6.0.0
+     , QuickCheck
+-    , aeson >=1.2.1.0
++    , aeson >=1.4.3.0
+     , base >=4.9 && <5
+     , bifunctors
+     , bytestring
+diff --git a/test/Data/Aeson/Config/FromValueSpec.hs b/test/Data/Aeson/Config/FromValueSpec.hs
+index 33de8b7..06b3eb9 100644
+--- a/test/Data/Aeson/Config/FromValueSpec.hs
++++ b/test/Data/Aeson/Config/FromValueSpec.hs
+@@ -85,7 +85,7 @@ spec = do
+         [yaml|
+         name: "Joe"
+         age: "23"
+-        |] `shouldDecodeTo` left "Error while parsing $.age - expected Int, encountered String"
++        |] `shouldDecodeTo` left "Error while parsing $.age - parsing Int failed, expected Number, but encountered String"
+ 
+     context "with (,)" $ do
+       it "captures unrecognized fields" $ do
+diff --git a/test/Data/Aeson/Config/TypesSpec.hs b/test/Data/Aeson/Config/TypesSpec.hs
+index c954534..472aa42 100644
+--- a/test/Data/Aeson/Config/TypesSpec.hs
++++ b/test/Data/Aeson/Config/TypesSpec.hs
+@@ -13,7 +13,7 @@ spec = do
+     context "List" $ do
+       let
+         parseError :: String -> Result (List Int)
+-        parseError prefix = Left (prefix ++ " - expected Int, encountered String")
++        parseError prefix = Left (prefix ++ " - parsing Int failed, expected Number, but encountered String")
+ 
+       context "when parsing single values" $ do
+         it "returns the value in a singleton list" $ do
+diff --git a/test/EndToEndSpec.hs b/test/EndToEndSpec.hs
+index 283c72c..46389ea 100644
+--- a/test/EndToEndSpec.hs
++++ b/test/EndToEndSpec.hs
+@@ -285,7 +285,7 @@ spec = around_ (inTempDirectoryNamed "foo") $ do
+           path: defaults.yaml
+           ref: "2017"
+         library: {}
+-        |] `shouldFailWith` (file ++ ": Error while parsing $ - expected Object, encountered Array")
++        |] `shouldFailWith` (file ++ ": Error while parsing $ - expected Object, but encountered Array")
+ 
+       it "warns on unknown fields" $ do
+         let file = joinPath ["defaults", "sol", "hpack-template", "2017", "defaults.yaml"]
+@@ -340,7 +340,7 @@ spec = around_ (inTempDirectoryNamed "foo") $ do
+       it "rejects other values" $ do
+         [i|
+         version: {}
+-        |] `shouldFailWith` "package.yaml: Error while parsing $.version - expected Number or String, encountered Object"
++        |] `shouldFailWith` "package.yaml: Error while parsing $.version - expected Number or String, but encountered Object"
+ 
+     describe "license" $ do
+       it "accepts cabal-style licenses" $ do
+@@ -1363,14 +1363,14 @@ spec = around_ (inTempDirectoryNamed "foo") $ do
+             then:
+               dependencies: Win32
+             else: null
+-          |] `shouldFailWith` "package.yaml: Error while parsing $.when.else - expected Object, encountered Null"
++          |] `shouldFailWith` "package.yaml: Error while parsing $.when.else - expected Object, but encountered Null"
+ 
+         it "rejects invalid conditionals" $ do
+           [i|
+             dependencies:
+               - foo
+               - 23
+-          |] `shouldFailWith` "package.yaml: Error while parsing $.dependencies[1] - expected Object or String, encountered Number"
++          |] `shouldFailWith` "package.yaml: Error while parsing $.dependencies[1] - expected Object or String, but encountered Number"
+ 
+         it "warns on unknown fields" $ do
+           [i|
+diff --git a/test/Hpack/ConfigSpec.hs b/test/Hpack/ConfigSpec.hs
+index 9f4b279..69cbea1 100644
+--- a/test/Hpack/ConfigSpec.hs
++++ b/test/Hpack/ConfigSpec.hs
+@@ -675,7 +675,7 @@ spec = do
+       it "rejects other values" $ do
+         [yaml|
+         23
+-        |] `shouldDecodeTo` (Left "Error while parsing $ - expected Boolean or String, encountered Number" :: Result Cond)
++        |] `shouldDecodeTo` (Left "Error while parsing $ - expected Boolean or String, but encountered Number" :: Result Cond)
+ 
+   describe "formatOrList" $ do
+     it "formats a singleton list" $ do
+diff --git a/test/Hpack/Syntax/DefaultsSpec.hs b/test/Hpack/Syntax/DefaultsSpec.hs
+index 5875413..5438b7a 100644
+--- a/test/Hpack/Syntax/DefaultsSpec.hs
++++ b/test/Hpack/Syntax/DefaultsSpec.hs
+@@ -151,4 +151,4 @@ spec = do
+         it "fails" $ do
+           [yaml|
+           10
+-          |] `shouldDecodeTo` left "Error while parsing $ - expected Object or String, encountered Number"
++          |] `shouldDecodeTo` left "Error while parsing $ - expected Object or String, but encountered Number"
+diff --git a/test/Hpack/Syntax/DependenciesSpec.hs b/test/Hpack/Syntax/DependenciesSpec.hs
+index 1a83732..d95044f 100644
+--- a/test/Hpack/Syntax/DependenciesSpec.hs
++++ b/test/Hpack/Syntax/DependenciesSpec.hs
+@@ -125,7 +125,7 @@ spec = do
+         it "rejects invalid values" $ do
+           [yaml|
+             hpack: []
+-          |] `shouldDecodeTo` left "Error while parsing $.hpack - expected Null, Object, Number, or String, encountered Array"
++          |] `shouldDecodeTo` left "Error while parsing $.hpack - expected Null, Object, Number, or String, but encountered Array"
+ 
+         context "when the constraint is a Number" $ do
+           it "accepts 1" $ do
+@@ -213,7 +213,7 @@ spec = do
+               [yaml|
+                 foo:
+                   version: {}
+-              |] `shouldDecodeTo` left "Error while parsing $.foo.version - expected Null, Number, or String, encountered Object"
++              |] `shouldDecodeTo` left "Error while parsing $.foo.version - expected Null, Number, or String, but encountered Object"
+ 
+             it "accepts a string" $ do
+               [yaml|
+-- 
+2.23.0
+