Merge pull request #863 from nkshigeru/gemtest_for_vc

declare local variable at the start of a block in generated gem_test.c

tasks/mrbgems_test.rake

@@ -16,7 +16,7 @@ MRuby.each_target do
         f.puts %Q[void GENERATED_TMP_mrb_#{g.funcname}_gem_test(mrb_state *mrb) {]
         unless g.test_rbfiles.empty?
           f.puts %Q[  mrb_state *mrb2;]
-          f.puts %Q[  mrb_value val1, val2, ary1, ary2;]
+          f.puts %Q[  mrb_value val1, val2, ary1, ary2, test_args_hash;]
           f.puts %Q[  int ai;]
           g.test_rbfiles.count.times do |i|
             f.puts %Q[  ai = mrb_gc_arena_save(mrb);]
@@ -29,7 +29,7 @@ MRuby.each_target do
             f.puts %Q[  mrb_const_set(mrb2, mrb_obj_value(mrb2->object_class), mrb_intern(mrb2, "GEMNAME"), mrb_str_new(mrb2, "#{g.name}", #{g.name.length}));]
 
             if not g.test_args.empty?
-              f.puts %Q[  mrb_value test_args_hash = mrb_hash_new_capa(mrb, #{g.test_args.length}); ]
+              f.puts %Q[  test_args_hash = mrb_hash_new_capa(mrb, #{g.test_args.length}); ]
               g.test_args.each do |arg_name, arg_value|
                 escaped_arg_name = arg_name.gsub('\\', '\\\\\\\\').gsub('"', '\"')
                 escaped_arg_value = arg_value.gsub('\\', '\\\\\\\\').gsub('"', '\"')