https://git.ruby-lang.org/ruby.git/commit/?id=762be87759

From 762be87759385cd495246b13c8c8eff5c3db0a3c Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Wed, 21 Oct 2020 23:36:49 +0900
Subject: test/json/json_parser_test.rb: suppress warnings

http://rubyci.s3.amazonaws.com/ubuntu/ruby-master/log/20201021T123003Z.log.html.gz
```
/home/chkbuild/chkbuild/tmp/build/20201021T123003Z/ruby/test/json/json_parser_test.rb:227: warning: ambiguous first argument; put parentheses or a space even after `-' operator
/home/chkbuild/chkbuild/tmp/build/20201021T123003Z/ruby/test/json/json_parser_test.rb:228: warning: ambiguous first argument; put parentheses or a space even after `-' operator
```

diff --git a/test/json/json_parser_test.rb b/test/json/json_parser_test.rb
index c7f1a5f..dce693e 100644
--- a/test/json/json_parser_test.rb
+++ b/test/json/json_parser_test.rb
@@ -224,8 +224,8 @@ class JSONParserTest < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/json/json_parser_test.rb#L224
     assert_predicate parse('"foo"', :freeze => true), :frozen?
 
     if string_deduplication_available?
-      assert_same -'foo', parse('"foo"', :freeze => true)
-      assert_same -'foo', parse('{"foo": 1}', :freeze => true).keys.first
+      assert_same(-'foo', parse('"foo"', :freeze => true))
+      assert_same(-'foo', parse('{"foo": 1}', :freeze => true).keys.first)
     end
   end
 
-- 
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