From the Changelog

        * eval.c (eval): warning during eval should not cause deadlock.
          [ruby-talk:98651]

 If I've well understood the patch I'm not sure that it's a good idea to
 do it like this

svg% cat b.rb
#!./ruby
def foo(*a) p "here"; end
Thread.new { $SAFE=4; eval("foo foo foo") }.value
svg% 

svg% ./ruby -v b.rb
ruby 1.9.0 (2004-05-13) [i686-linux]
(eval):1: warning: parenthesize argument(s) for future version
"here"
"here"
"here"
svg% 



Guy Decoux