From 0cb1fc3850db6367fa720bf3b603bb1fde2ef813 Mon Sep 17 00:00:00 2001
From: Jean Boussier <byroot@ruby-lang.org>
Date: Thu, 2 Nov 2023 17:38:24 +0100
Subject: Fix vm_getivar to handle module with TOO_COMPLEX shape

---
 test/ruby/test_shapes.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_shapes.rb b/test/ruby/test_shapes.rb
index 09a99c4855..4967b404e2 100644
--- a/test/ruby/test_shapes.rb
+++ b/test/ruby/test_shapes.rb
@@ -275,6 +275,25 @@ class TestShapes < Test::Unit::TestCase
     end;
   end
 
+  def test_run_out_of_shape_for_module_ivar
+    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      o = Object.new
+      i = 0
+      while RubyVM::Shape.shapes_available > 0
+        o.instance_variable_set(:"@i#{i}", 1)
+        i += 1
+      end
+
+      module Foo
+        @a = 1
+        @b = 2
+        assert_equal 1, @a
+        assert_equal 2, @b
+      end
+    end;
+  end
+
   def test_run_out_of_shape_for_class_cvar
     assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
     begin;
-- 
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