* ext/psych/parser.c: removed external encoding setter, allow parser

to be reused.
* ext/psych/lib/psych/parser.rb: added external encoding setter.
* test/psych/test_parser.rb: test parser reuse

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/psych/test_parser.rb

@@ -32,6 +32,12 @@ module Psych
       @handler.parser = @parser
     end
 
+    def test_multiparse
+      3.times do
+        @parser.parse '--- foo'
+      end
+    end
+
     def test_filename
       ex = assert_raises(Psych::SyntaxError) do
         @parser.parse '--- `', 'omg!'
@@ -87,15 +93,6 @@ module Psych
       assert_equal 19, @parser.mark.index
     end
 
-    def test_set_encoding_twice
-      @parser.external_encoding = Psych::Parser::UTF16LE
-
-      e = assert_raises(Psych::Exception) do
-        @parser.external_encoding = Psych::Parser::UTF16LE
-      end
-      assert_equal "don't set the encoding twice!", e.message
-    end
-
     def test_bom
       tadpole = 'おたまじゃくし'