if event_hooks is set. fixed: [ruby-core:04662]
(backported from HEAD)
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@8263 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* test/ruby/test_settracefunc.rb: added test for c-return.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@8165 b2dd03c8-39d4-4d8f-98ff-823fe69b080e