https://git.ruby-lang.org/ruby.git/commit/?id=53ba9fb74e

From 53ba9fb74ec57c18c3589e2e51f84a36467e3d9e Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 31 Aug 2020 16:49:16 +0900
Subject: Prohibit setter method names in endless method definition

https://bugs.ruby-lang.org/issues/16746#note-26

diff --git a/parse.y b/parse.y
index 4efbd8c..83e6d20 100644
--- a/parse.y
+++ b/parse.y
@@ -2474,6 +2474,9 @@ arg		: lhs '=' arg_rhs https://github.com/ruby/ruby/blob/trunk/parse.y#L2474
 		    }
 		| defn_head f_paren_args '=' arg
 		    {
+			if (is_attrset_id($<node>1->nd_mid)) {
+			    yyerror1(&@1, "setter method cannot be defined in an endless method definition");
+			}
 			token_info_drop(p, "def", @1.beg_pos);
 			restore_defun(p, $<node>1->nd_defn);
 		    /*%%%*/
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 546b5a2..fb982e8 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1429,6 +1429,7 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L1429
     end
     assert_equal("class ok", k.rescued("ok"))
     assert_equal("instance ok", k.new.rescued("ok"))
+    assert_syntax_error('def foo=() = 42', /setter method cannot be defined in an endless method definition/)
   end
 
   def test_methoddef_in_cond
-- 
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