1 files changed, 8 insertions, 4 deletions
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index ac191531de..aa0bf35b80 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -129,7 +129,7 @@ class TestISeq < Test::Unit::TestCase
   def test_lambda_with_ractor_roundtrip
     iseq = compile(<<~EOF, __LINE__+1)
       x = 42
-      y = lambda { x }
+      y = nil.instance_eval{ lambda { x } }
       Ractor.make_shareable(y)
       y.call
     EOF
@@ -148,16 +148,20 @@ class TestISeq < Test::Unit::TestCase
 
   def test_ractor_unshareable_outer_variable
     name = "\u{2603 26a1}"
-    y = eval("proc {#{name} = nil; proc {|x| #{name} = x}}").call
+    y = nil.instance_eval do
+      eval("proc {#{name} = nil; proc {|x| #{name} = x}}").call
+    end
     assert_raise_with_message(ArgumentError, /\(#{name}\)/) do
       Ractor.make_shareable(y)
     end
-    y = eval("proc {#{name} = []; proc {|x| #{name}}}").call
+    y = nil.instance_eval do
+      eval("proc {#{name} = []; proc {|x| #{name}}}").call
+    end
     assert_raise_with_message(Ractor::IsolationError, /`#{name}'/) do
       Ractor.make_shareable(y)
     end
     obj = Object.new
-    def obj.foo(*) ->{super} end
+    def obj.foo(*) nil.instance_eval{ ->{super} } end
     assert_raise_with_message(Ractor::IsolationError, /hidden variable/) do
       Ractor.make_shareable(obj.foo)
     end