From 23375c8b81e07644517e5ad985b2fbf5e1b5d545 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 29 Apr 2019 13:42:50 +0900
Subject: [PATCH] Make only `mesg` can be assigned with default `fname`

---
 test/lib/test/unit/assertions.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index caee3b18f7..51f89d5ae0 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -500,7 +500,9 @@ EOT
         end
       end
 
-      def prepare_syntax_check(code, fname = caller_locations(2, 1)[0], mesg = fname.to_s, verbose: nil)
+      def prepare_syntax_check(code, fname = nil, mesg = nil, verbose: nil)
+        fname ||= caller_locations(2, 1)[0]
+        mesg ||= fname.to_s
         verbose, $VERBOSE = $VERBOSE, verbose
         case
         when Array === fname