Freeze Regexp literals

[Feature #8948] [Feature #16377]

Since Regexp literals always reference the same instance,
allowing to mutate them can lead to state leak.

1 files changed, 6 insertions, 0 deletions

diff --git a/spec/ruby/language/regexp_spec.rb b/spec/ruby/language/regexp_spec.rb
index 67c7c034e9..5881afe6f1 100644
--- a/spec/ruby/language/regexp_spec.rb
+++ b/spec/ruby/language/regexp_spec.rb
@@ -18,6 +18,12 @@ describe "Literal Regexps" do
     /Hello/.should be_kind_of(Regexp)
   end
 
+  ruby_version_is "2.7" do
+    it "is frozen" do
+      /Hello/.frozen?.should == true
+    end
+  end
+
   it "caches the Regexp object" do
     rs = []
     2.times do |i|