Merge pull request #4368 from CocoaPods/seg-ruby-2.3-resolver

[Resolver] Fix resolution on Ruby 2.3

CHANGELOG.md

@@ -4,6 +4,15 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 
 To install release candidates run `[sudo] gem install cocoapods --pre`
 
+## Master
+
+##### Bug Fixes
+
+* Fix a crash in dependency resolution when running Ruby 2.3.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#4345](https://github.com/CocoaPods/CocoaPods/issues/4345)
+
+
 ## 0.39.0 (2015-10-09)
 
 ##### Enhancements

lib/cocoapods/resolver/lazy_specification.rb

@@ -14,6 +14,10 @@ module Pod
           specification.send(method, *args, &block)
         end
 
+        def respond_to_missing?(method, include_all = false)
+          specification.respond_to?(method, include_all)
+        end
+
         def subspec_by_name(name = nil, raise_if_missing = true)
           if !name || name == self.name
             self