https://git.ruby-lang.org/ruby.git/commit/?id=140b8117bd

From 140b8117bd3c32cb9d0b144937b90f0178a00b0e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 11 Jun 2019 02:09:00 +0900
Subject: &. is not allowed inside LHS of massign

https://hackerone.com/reports/605262

diff --git a/parse.y b/parse.y
index 6fc098b..bf6c726 100644
--- a/parse.y
+++ b/parse.y
@@ -1787,6 +1787,9 @@ mlhs_node	: user_variable https://github.com/ruby/ruby/blob/trunk/parse.y#L1787
 		    }
 		| primary_value call_op tIDENTIFIER
 		    {
+			if ($2 == tANDDOT) {
+			    yyerror1(&@2, "&. inside LHS of multiple assignment");
+			}
 		    /*%%%*/
 			$$ = attrset(p, $1, $2, $3, &@$);
 		    /*% %*/
@@ -1801,6 +1804,9 @@ mlhs_node	: user_variable https://github.com/ruby/ruby/blob/trunk/parse.y#L1804
 		    }
 		| primary_value call_op tCONSTANT
 		    {
+			if ($2 == tANDDOT) {
+			    yyerror1(&@2, "&. inside LHS of multiple assignment");
+			}
 		    /*%%%*/
 			$$ = attrset(p, $1, $2, $3, &@$);
 		    /*% %*/
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 6fdca37..8112b14 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -976,6 +976,11 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L976
     assert_valid_syntax("a\n.:foo")
   end
 
+  def test_safe_call_in_massign_lhs
+    assert_syntax_error("*a&.x=0", /LHS/)
+    assert_syntax_error("a&.x,=0", /LHS/)
+  end
+
   def test_no_warning_logop_literal
     assert_warning("") do
       eval("true||raise;nil")
-- 
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