merge revision(s) 59033,59034: [Backport #13636]

rexml: add close tag check on end of document to StreamParser

	[ruby-core:81593] [Bug #13636]

	Reported by Anton Sivakov. Thanks!!!

	* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rexml/parsers/streamparser.rb

@@ -7,6 +7,7 @@ module REXML
       def initialize source, listener
         @listener = listener
         @parser = BaseParser.new( source )
+        @tag_stack = []
       end
 
       def add_listener( listener )
@@ -19,14 +20,21 @@ module REXML
           event = @parser.pull
           case event[0]
           when :end_document
+            unless @tag_stack.empty?
+              tag_path = "/" + @tag_stack.join("/")
+              raise ParseException.new("Missing end tag for '#{tag_path}'",
+                                       @parser.source)
+            end
             return
           when :start_element
+            @tag_stack << event[1]
             attrs = event[2].each do |n, v|
               event[2][n] = @parser.unnormalize( v )
             end
             @listener.tag_start( event[1], attrs )
           when :end_element
             @listener.tag_end( event[1] )
+            @tag_stack.pop
           when :text
             normalized = @parser.unnormalize( event[1] )
             @listener.text( normalized )