https://git.ruby-lang.org/ruby.git/commit/?id=1fe5bffefd

From 1fe5bffefdf799c24f4a0eed97e1ceefc1dc66d6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 22 Apr 2020 18:56:06 +0900
Subject: Disallow R-assign in endless def


diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 2f81d72..c471006 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1419,6 +1419,8 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L1419
     assert_valid_syntax('private def inc(x) = x + 1')
     assert_valid_syntax('private def obj.foo = 42')
     assert_valid_syntax('private def obj.inc(x) = x + 1')
+    eval('def self.inc(x) = x + 1 => @x')
+    assert_equal(:inc, @x)
   end
 
   def test_methoddef_in_cond
-- 
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