3 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/core/matchdata/allocate_spec.rb b/spec/ruby/core/matchdata/allocate_spec.rb
new file mode 100644
index 0000000000..9f3ada4018
--- /dev/null
+++ b/spec/ruby/core/matchdata/allocate_spec.rb
@@ -0,0 +1,10 @@
+require_relative '../../spec_helper'
+
+describe "MatchData.allocate" do
+  ruby_version_is "2.7" do
+    it "is undefined" do
+      # https://bugs.ruby-lang.org/issues/16294
+      -> { MatchData.allocate }.should raise_error(NoMethodError)
+    end
+  end
+end
diff --git a/spec/ruby/core/matchdata/dup_spec.rb b/spec/ruby/core/matchdata/dup_spec.rb
new file mode 100644
index 0000000000..70877f07eb
--- /dev/null
+++ b/spec/ruby/core/matchdata/dup_spec.rb
@@ -0,0 +1,14 @@
+require_relative '../../spec_helper'
+
+describe "MatchData#dup" do
+  it "duplicates the match data" do
+    original = /ll/.match("hello")
+    original.instance_variable_set(:@custom_ivar, 42)
+    duplicate = original.dup
+
+    duplicate.instance_variable_get(:@custom_ivar).should == 42
+    original.regexp.should == duplicate.regexp
+    original.string.should == duplicate.string
+    original.offset(0).should == duplicate.offset(0)
+  end
+end
diff --git a/spec/ruby/core/matchdata/regexp_spec.rb b/spec/ruby/core/matchdata/regexp_spec.rb
index 7a4783434c..099b59c559 100644
--- a/spec/ruby/core/matchdata/regexp_spec.rb
+++ b/spec/ruby/core/matchdata/regexp_spec.rb
@@ -11,6 +11,12 @@ describe "MatchData#regexp" do
     m.regexp.should == /hay/
   end
 
+  it "returns the same Regexp used to match" do
+    r = /hay/
+    m = 'haystack'.match(r)
+    m.regexp.object_id.should == r.object_id
+  end
+
   it "returns a Regexp for the result of gsub(String)" do
     'he[[o'.gsub('[', ']')
     $~.regexp.should == /\[/