From 04494d9e4064a57accc8309da9b35754a3d24973 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Fri, 12 Dec 2025 12:00:35 +0900
Subject: `Binding#local_variable_defined?` must not handle numbered parameters

[Bug #21776]
---
 test/ruby/test_proc.rb | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 2cd97ca324..d6bd8e724e 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -1659,29 +1659,35 @@ class TestProc < Test::Unit::TestCase
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:_9) }
       assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      assert_equal(false, binding.local_variable_defined?(:_9))
       "bar".tap do
         assert_equal([], binding.local_variables)
         assert_raise(NameError) { binding.local_variable_get(:_9) }
         assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+        assert_equal(false, binding.local_variable_defined?(:_9))
       end
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:_9) }
       assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      assert_equal(false, binding.local_variable_defined?(:_9))
     end
 
     "foo".tap do
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:_9) }
       assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      assert_equal(false, binding.local_variable_defined?(:_9))
       "bar".tap do
         _9 and flunk
         assert_equal([], binding.local_variables)
         assert_raise(NameError) { binding.local_variable_get(:_9) }
         assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+        assert_equal(false, binding.local_variable_defined?(:_9))
       end
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:_9) }
       assert_raise(NameError) { binding.local_variable_set(:_9, 1) }
+      assert_equal(false, binding.local_variable_defined?(:_9))
     end
   end
 
@@ -1690,31 +1696,39 @@ class TestProc < Test::Unit::TestCase
       it
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:it) }
+      assert_equal(false, binding.local_variable_defined?(:it))
       "bar".tap do
         assert_equal([], binding.local_variables)
         assert_raise(NameError) { binding.local_variable_get(:it) }
+        assert_equal(false, binding.local_variable_defined?(:it))
       end
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:it) }
+      assert_equal(false, binding.local_variable_defined?(:it))
       "bar".tap do
         it
         assert_equal([], binding.local_variables)
         assert_raise(NameError) { binding.local_variable_get(:it) }
+        assert_equal(false, binding.local_variable_defined?(:it))
       end
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:it) }
+      assert_equal(false, binding.local_variable_defined?(:it))
     end
 
     "foo".tap do
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:it) }
+      assert_equal(false, binding.local_variable_defined?(:it))
       "bar".tap do
         it
         assert_equal([], binding.local_variables)
         assert_raise(NameError) { binding.local_variable_get(:it) }
+        assert_equal(false, binding.local_variable_defined?(:it))
       end
       assert_equal([], binding.local_variables)
       assert_raise(NameError) { binding.local_variable_get(:it) }
+      assert_equal(false, binding.local_variable_defined?(:it))
     end
   end
 
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