From 1c5af02565ff306a5a42308748df826ad6d765e4 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Mon, 6 Feb 2017 11:21:23 +0900
Subject: [PATCH] Suppress warnings in eval

The argument text may contain warnings, which are useless to check
if parseable.
---
 lib/rdoc/markup/to_html.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/rdoc/markup/to_html.rb b/lib/rdoc/markup/to_html.rb
index 3bf66c2c31..aa5de7bf66 100644
--- a/lib/rdoc/markup/to_html.rb
+++ b/lib/rdoc/markup/to_html.rb
@@ -383,9 +383,12 @@ def list_end_for(list_type)
   # Returns true if text is valid ruby syntax
 
   def parseable? text
+    verbose, $VERBOSE = $VERBOSE, nil
     eval("BEGIN {return true}\n#{text}")
   rescue SyntaxError
     false
+  ensure
+    $VERBOSE = verbose
   end
 
   ##