2 files changed, 47 insertions, 0 deletions
diff --git a/insns.def b/insns.def
index 8d609927b5..c6ebf7401b 100644
--- a/insns.def
+++ b/insns.def
@@ -1023,6 +1023,7 @@ opt_setinlinecache
 (IC ic)
 (VALUE val)
 (VALUE val)
+// attr bool leaf = false;
 {
     vm_ic_update(GET_ISEQ(), ic, val, GET_EP());
 }
diff --git a/test/ruby/test_insns_leaf.rb b/test/ruby/test_insns_leaf.rb
new file mode 100644
index 0000000000..9c9a4324cb
--- /dev/null
+++ b/test/ruby/test_insns_leaf.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: false
+require 'test/unit'
+
+class TestInsnsLeaf < Test::Unit::TestCase
+  require "set"
+
+  class Id
+    attr_reader :db_id
+    def initialize(db_id)
+      @db_id = db_id
+    end
+
+    def ==(other)
+      other.class == self.class && other.db_id == db_id
+    end
+    alias_method :eql?, :==
+
+    def hash
+      10
+    end
+
+    def <=>(other)
+      db_id <=> other.db_id if other.is_a?(self.class)
+    end
+  end
+
+  class Namespace
+    IDS = Set[
+      Id.new(1).freeze,
+      Id.new(2).freeze,
+      Id.new(3).freeze,
+      Id.new(4).freeze,
+    ].freeze
+
+    class << self
+      def test?(id)
+	IDS.include?(id)
+      end
+    end
+  end
+
+  def test_insns_leaf
+    assert Namespace.test?(Id.new(1)), "IDS should include 1"
+    assert !Namespace.test?(Id.new(5)), "IDS should not include 5"
+  end
+end