Prevent syntax warnings in test/ruby/test_regexp.rb

test/ruby/test_regexp.rb

@@ -716,7 +716,7 @@ class TestRegexp < Test::Unit::TestCase
       h = {}
       ObjectSpace.count_objects(h)
       prev_matches = h[:T_MATCH] || 0
-      md = /[A-Z]/.match('1') # no match
+      _md = /[A-Z]/.match('1') # no match
       ObjectSpace.count_objects(h)
       new_matches = h[:T_MATCH] || 0
       assert_equal prev_matches, new_matches, "Bug [#20104]"
@@ -2009,11 +2009,11 @@ class TestRegexp < Test::Unit::TestCase
   end
 
   def test_bug_20098 # [Bug #20098]
-    assert /a((.|.)|bc){,4}z/.match? 'abcbcbcbcz'
-    assert /a(b+?c*){4,5}z/.match? 'abbbccbbbccbcbcz'
-    assert /a(b+?(.|.)){2,3}z/.match? 'abbbcbbbcbbbcz'
-    assert /a(b*?(.|.)[bc]){2,5}z/.match? 'abcbbbcbcccbcz'
-    assert /^(?:.+){2,4}?b|b/.match? "aaaabaa"
+    assert(/a((.|.)|bc){,4}z/.match? 'abcbcbcbcz')
+    assert(/a(b+?c*){4,5}z/.match? 'abbbccbbbccbcbcz')
+    assert(/a(b+?(.|.)){2,3}z/.match? 'abbbcbbbcbbbcz')
+    assert(/a(b*?(.|.)[bc]){2,5}z/.match? 'abcbbbcbcccbcz')
+    assert(/^(?:.+){2,4}?b|b/.match? "aaaabaa")
   end
 
   def test_linear_time_p