Fix test failure on spec/ruby/language/pattern_matching_spec.rb

https://github.com/ruby/ruby/runs/3369486308

spec/ruby/language/pattern_matching_spec.rb

@@ -1138,12 +1138,15 @@ ruby_version_is "2.7" do
 
     ruby_version_is "3.1" do
       it "can omit parentheses in one line pattern matching" do
-        [1, 2] => a, b
-        a.should == 1
-        b.should == 2
+        eval(<<~RUBY).should == [1, 2]
+          [1, 2] => a, b
+          [a, b]
+        RUBY
 
-        {a: 1} => a:
-        a.should == 1
+        eval(<<~RUBY).should == 1
+          {a: 1} => a:
+          a
+        RUBY
       end
     end
   end