From 3d996e827f2ff74a1bb7e978d754cea7d957b9eb Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Fri, 26 Jan 2024 09:44:09 -0500
Subject: [PRISM] Keyword arguments incorrectly passed as mutable

Fixes ruby/prism#2279.
---
 test/ruby/test_compile_prism.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index 4ccea6d319..05e95e8b06 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -2134,6 +2134,16 @@ end
     def test_KeywordRestParameterNode
       assert_prism_eval("def prism_test_keyword_rest_parameter_node(a, **b); end")
       assert_prism_eval("Object.tap { |**| }")
+
+      # Test that KeywordRestParameterNode creates a copy
+      assert_prism_eval(<<~RUBY)
+        hash = {}
+        o = Object.new
+        def o.foo(**a) = a[:foo] = 1
+
+        o.foo(**hash)
+        hash
+      RUBY
     end
 
     def test_NoKeywordsParameterNode
-- 
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