https://git.ruby-lang.org/ruby.git/commit/?id=fc66947c61

From fc66947c61fe20f6f584ab3b1f7a5f10982af87e Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 30 Sep 2019 20:22:29 +0900
Subject: test/-ext-/string/test_fstring.rb: suppress "possibly useless use of
 -@"

"in void context" by assigning the result to a dummy variable.

diff --git a/test/-ext-/string/test_fstring.rb b/test/-ext-/string/test_fstring.rb
index 9a54f6b..71b12e9 100644
--- a/test/-ext-/string/test_fstring.rb
+++ b/test/-ext-/string/test_fstring.rb
@@ -73,7 +73,7 @@ class Test_String_Fstring < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/-ext-/string/test_fstring.rb#L73
   end
 
   def test_shared_string_safety
-    -('a' * 30).force_encoding(Encoding::ASCII)
+    _unused = -('a' * 30).force_encoding(Encoding::ASCII)
     str = ('a' * 30).force_encoding(Encoding::ASCII).taint
     frozen_str = Bug::String.rb_str_new_frozen(str)
     assert_fstring(frozen_str) {|s| assert_equal(str, s)}
-- 
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