From 193321503804586ebf7da3ea1e00bcc109bc1968 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 13 Mar 2017 09:05:35 +0000
Subject: [PATCH] Raise error if spec is nil

With parallel test-all, the spec is sometimes nil.
To debug it raise more detailed error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57956 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/rubygems/specification.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 5bbaec3911..a2f289d162 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -1128,6 +1128,9 @@ class Gem::Specification < Gem::BasicSpecification
     native = {}
 
     specs.reverse_each do |spec|
+      unless spec
+        raise Gem::Exception, "unexpectedly spec is nil: #{specs}"
+      end
       next if spec.version.prerelease? unless prerelease
 
       native[spec.name] = spec.version if spec.platform == Gem::Platform::RUBY