From a850cd1a87bef738c40d9c550fb8823699083f2e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 26 Mar 2024 10:04:54 +0900
Subject: [PATCH] [Bug #20392] Block arguments duplication check at `super`

---
 parse.y                  | 3 ++-
 test/ruby/test_syntax.rb | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/parse.y b/parse.y
index 28b03f8cd1..585130c346 100644
--- a/parse.y
+++ b/parse.y
@@ -2063,8 +2063,9 @@ get_nd_args(struct parser_params *p, NODE *node)
         return RNODE_FCALL(node)->nd_args;
       case NODE_QCALL:
         return RNODE_QCALL(node)->nd_args;
-      case NODE_VCALL:
       case NODE_SUPER:
+        return RNODE_SUPER(node)->nd_args;
+      case NODE_VCALL:
       case NODE_ZSUPER:
       case NODE_YIELD:
       case NODE_RETURN:
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 42108f955f..371c41fe37 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -2154,6 +2154,13 @@ eom
     assert_equal 0...1, exp.call(a: 0)
   end
 
+  def test_argument_forwarding_with_super
+    assert_valid_syntax('def foo(...) super {}; end')
+    assert_valid_syntax('def foo(...) super() {}; end')
+    assert_syntax_error('def foo(...) super(...) {}; end', /both block arg and actual block/)
+    assert_syntax_error('def foo(...) super(1, ...) {}; end', /both block arg and actual block/)
+  end
+
   def test_class_module_Object_ancestors
     assert_separately([], <<-RUBY)
       m = Module.new