https://git.ruby-lang.org/ruby.git/commit/?id=67b77240ee

From 67b77240ee72a401226ffe2127daaf3a65109ee1 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 30 Mar 2020 22:11:15 +0000
Subject: merge revision(s) 6e6844320de989cb88a154e2ac75066ccea1bba2: [Backport
 #16619]

	Fixed duplicated warning

	As `command_rhs` is always a "value expression", `command_asgn`
	does not need the same check.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/parse.y b/parse.y
index 8d83132..383e76f 100644
--- a/parse.y
+++ b/parse.y
@@ -1511,12 +1511,10 @@ stmt		: keyword_alias fitem {SET_LEX_STATE(EXPR_FNAME|EXPR_FITEM);} fitem https://github.com/ruby/ruby/blob/trunk/parse.y#L1511
 
 command_asgn	: lhs '=' command_rhs
 		    {
-			value_expr($3);
 			$$ = node_assign($1, $3, &@$);
 		    }
 		| var_lhs tOP_ASGN command_rhs
 		    {
-			value_expr($3);
 			$$ = new_op_assign($1, $2, $3, &@$);
 		    }
 		| primary_value '[' opt_call_args rbracket tOP_ASGN command_rhs
@@ -1524,7 +1522,6 @@ command_asgn	: lhs '=' command_rhs https://github.com/ruby/ruby/blob/trunk/parse.y#L1522
 		    /*%%%*/
 			NODE *args;
 
-			value_expr($6);
 			$3 = make_array($3, &@3);
 			args = arg_concat($3, $6, &@$);
 			if ($5 == tOROP) {
@@ -1543,12 +1540,10 @@ command_asgn	: lhs '=' command_rhs https://github.com/ruby/ruby/blob/trunk/parse.y#L1540
 		    }
 		| primary_value call_op tIDENTIFIER tOP_ASGN command_rhs
 		    {
-			value_expr($5);
 			$$ = new_attr_op_assign($1, $2, $3, $4, $5, &@$);
 		    }
 		| primary_value call_op tCONSTANT tOP_ASGN command_rhs
 		    {
-			value_expr($5);
 			$$ = new_attr_op_assign($1, $2, $3, $4, $5, &@$);
 		    }
 		| primary_value tCOLON2 tCONSTANT tOP_ASGN command_rhs
@@ -1564,7 +1559,6 @@ command_asgn	: lhs '=' command_rhs https://github.com/ruby/ruby/blob/trunk/parse.y#L1559
 		    }
 		| primary_value tCOLON2 tIDENTIFIER tOP_ASGN command_rhs
 		    {
-			value_expr($5);
 			$$ = new_attr_op_assign($1, ID2VAL(idCOLON2), $3, $4, $5, &@$);
 		    }
 		| backref tOP_ASGN command_rhs
diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index 15c6245..b725634 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1099,6 +1099,12 @@ x = __ENCODING__ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_parse.rb#L1099
     assert_raise(SyntaxError) { eval("def m\n\C-z""end") }
   end
 
+  def test_void_value_in_command_rhs
+    w = "void value expression"
+    ex = assert_syntax_error("x = return 1", w)
+    assert_equal(1, ex.message.scan(w).size, "same #{w.inspect} warning should be just once")
+  end
+
 =begin
   def test_past_scope_variable
     assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}
diff --git a/version.h b/version.h
index ab78511..56fcb94 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.5.8"
 #define RUBY_RELEASE_DATE "2020-03-31"
-#define RUBY_PATCHLEVEL 217
+#define RUBY_PATCHLEVEL 218
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 3
-- 
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