timeout.rb: freeze a string message

* lib/timeout.rb (Timeout#timeout): freeze a string message to
  reduce string allocations.  [Fix GH-996]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51566 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/timeout.rb b/lib/timeout.rb
index 20a594898f..63a629923d 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -71,7 +71,7 @@ module Timeout
   # a module method, so you can call it directly as Timeout.timeout().
   def timeout(sec, klass = nil)   #:yield: +sec+
     return yield(sec) if sec == nil or sec.zero?
-    message = "execution expired"
+    message = "execution expired".freeze
     e = Error
     bl = proc do |exception|
       begin