https://git.ruby-lang.org/ruby.git/commit/?id=022c7bbea9

From 022c7bbea98ef41556941a21ef6f0656bb49c75f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 12 Apr 2020 00:07:57 +0900
Subject: Relaxed of R-assign value to arg


diff --git a/parse.y b/parse.y
index 794e676..2c5eaf1 100644
--- a/parse.y
+++ b/parse.y
@@ -1506,18 +1506,16 @@ stmt		: keyword_alias fitem {SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);} fitem https://github.com/ruby/ruby/blob/trunk/parse.y#L1506
 		| expr
 		;
 
-rassign 	: primary tASSOC lhs
+rassign 	: arg_value tASSOC lhs
 		    {
 		    /*%%%*/
-			value_expr($1);
 			$$ = node_assign(p, $3, $1, &@$);
 		    /*% %*/
 		    /*% ripper: assign!($3, $1) %*/
 		    }
-		| primary tASSOC mlhs
+		| arg_value tASSOC mlhs
 		    {
 		    /*%%%*/
-			value_expr($1);
 			$$ = node_assign(p, $3, $1, &@$);
 		    /*% %*/
 		    /*% ripper: massign!($3, $1) %*/
@@ -1525,7 +1523,6 @@ rassign 	: primary tASSOC lhs https://github.com/ruby/ruby/blob/trunk/parse.y#L1523
 		| rassign tASSOC lhs
 		    {
 		    /*%%%*/
-			value_expr($1);
 			$$ = node_assign(p, $3, $1, &@$);
 		    /*% %*/
 		    /*% ripper: assign!($3, $1) %*/
@@ -1533,7 +1530,6 @@ rassign 	: primary tASSOC lhs https://github.com/ruby/ruby/blob/trunk/parse.y#L1530
 		| rassign tASSOC mlhs
 		    {
 		    /*%%%*/
-			value_expr($1);
 			$$ = node_assign(p, $3, $1, &@$);
 		    /*% %*/
 		    /*% ripper: massign!($3, $1) %*/
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 825d5e1..29813ce 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1571,6 +1571,7 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L1571
     assert_equal([2,3], eval("13.divmod(5) => a,b; [a, b]"))
     assert_equal([2,3,2,3], eval("13.divmod(5) => a,b => c, d; [a, b, c, d]"))
     assert_equal([2,3], eval("13.divmod(5)\n => a,b; [a, b]"))
+    assert_equal(3, eval("1+2 => a"))
   end
 
   private
-- 
cgit v0.10.2


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