* enum.c: added doc for Enumerable#zip

[fix GH-985] Patch by @yui-knk
* test/ruby/test_enum.rb: added tests for Enumerable#zip
  [fix GH-985] Patch @yui-knk

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51526 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Tue Aug 11 10:48:16 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* enum.c: added doc for Enumerable#zip
+	  [fix GH-985] Patch by @yui-knk
+	* test/ruby/test_enum.rb: added tests for Enumerable#zip
+	  [fix GH-985] Patch @yui-knk
+
 Tue Aug 11 10:33:26 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* vm_method.c: typo fix [fix GH-993][ci skip] Patch by @0x0dea

enum.c

@@ -2454,6 +2454,10 @@ zip_i(RB_BLOCK_CALL_FUNC_ARGLIST(val, memoval))
  *     [1, 2].zip(a, b)         #=> [[1, 4, 7], [2, 5, 8]]
  *     a.zip([1, 2], [8])       #=> [[4, 1, 8], [5, 2, nil], [6, nil, nil]]
  *
+ *     c = []
+ *     a.zip(b) { |x, y| c << x + y }  #=> nil
+ *     c                               #=> [11, 13, 15]
+ *
  */
 
 static VALUE

test/ruby/test_enum.rb

@@ -434,8 +434,11 @@ class TestEnumerable < Test::Unit::TestCase
 
   def test_zip
     assert_equal([[1,1],[2,2],[3,3],[1,1],[2,2]], @obj.zip(@obj))
+    assert_equal([["a",1],["b",2],["c",3]], ["a", "b", "c"].zip(@obj))
+
     a = []
-    @obj.zip([:a, :b, :c]) {|x,y| a << [x, y] }
+    result = @obj.zip([:a, :b, :c]) {|x,y| a << [x, y] }
+    assert_nil result
     assert_equal([[1,:a],[2,:b],[3,:c],[1,nil],[2,nil]], a)
 
     a = []