gnu: ruby-concurrent: Work around test failure on ARM.

* gnu/packages/patches/ruby-concurrent-test-arm.patch: New file.
* gnu/packages/ruby.scm (ruby-concurrent)[source](patches): Add it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -913,6 +913,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/rpm-CVE-2014-8118.patch			\
   %D%/packages/patches/rsem-makefile.patch			\
   %D%/packages/patches/ruby-concurrent-ignore-broken-test.patch	\
+  %D%/packages/patches/ruby-concurrent-test-arm.patch		\
   %D%/packages/patches/ruby-puma-ignore-broken-test.patch       \
   %D%/packages/patches/ruby-rack-ignore-failing-test.patch      \
   %D%/packages/patches/ruby-tzinfo-data-ignore-broken-test.patch\

gnu/packages/patches/ruby-concurrent-test-arm.patch

@@ -0,0 +1,36 @@
+Work around two test suite failures on ARM:
+
+  https://github.com/ruby-concurrency/concurrent-ruby/issues/547
+
+The regexps here assume addresses like "0x1234" but on ARM (32-bit)
+we get something like "0x-7db1e810" (notice the dash).
+
+diff --git a/spec/concurrent/edge/future_spec.rb b/spec/concurrent/edge/future_spec.rb
+index a48fd29..4344d7e 100644
+--- b/spec/concurrent/edge/future_spec.rb
++++ a/spec/concurrent/edge/future_spec.rb
+@@ -322,9 +322,9 @@
+       four  = three.delay.then(&:succ)
+ 
+       # meaningful to_s and inspect defined for Future and Promise
+-      expect(head.to_s).to match /<#Concurrent::Edge::Future:0x[\da-f]+ pending>/
++      expect(head.to_s).to match /<#Concurrent::Edge::Future:0x-?[\da-f]+ pending>/
+       expect(head.inspect).to(
+-          match(/<#Concurrent::Edge::Future:0x[\da-f]+ pending blocks:\[<#Concurrent::Edge::ThenPromise:0x[\da-f]+ pending>\]>/))
++          match(/<#Concurrent::Edge::Future:0x-?[\da-f]+ pending blocks:\[<#Concurrent::Edge::ThenPromise:0x-?[\da-f]+ pending>\]>/))
+ 
+       # evaluates only up to three, four is left unevaluated
+       expect(three.value!).to eq 3
+diff --git a/spec/concurrent/map_spec.rb b/spec/concurrent/map_spec.rb
+index 13fd5b7..1c82ebe 100644
+--- b/spec/concurrent/map_spec.rb
++++ a/spec/concurrent/map_spec.rb
+@@ -827,7 +827,7 @@
+     end
+ 
+     it '#inspect' do
+-      regexp = /\A#<Concurrent::Map:0x[0-9a-f]+ entries=[0-9]+ default_proc=.*>\Z/i
++      regexp = /\A#<Concurrent::Map:0x-?[0-9a-f]+ entries=[0-9]+ default_proc=.*>\Z/i
+       expect(Concurrent::Map.new.inspect).to match(regexp)
+       expect((Concurrent::Map.new {}).inspect).to match(regexp)
+       map = Concurrent::Map.new

gnu/packages/ruby.scm

@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014, 2015 Pjotr Prins <pjotr.guix@thebird.nl>
-;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014, 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net>
@@ -4102,7 +4102,8 @@ (define-public ruby-concurrent
          "1x3g2admp14ykwfxidsicqbhlfsnxh9wyc806np4i15hws4if1d8"))
        ;; Exclude failing test reported at
        ;; https://github.com/ruby-concurrency/concurrent-ruby/issues/534
-       (patches (search-patches "ruby-concurrent-ignore-broken-test.patch"))))
+       (patches (search-patches "ruby-concurrent-ignore-broken-test.patch"
+                                "ruby-concurrent-test-arm.patch"))))
     (build-system ruby-build-system)
     (arguments
      `(#:test-target "spec"