destination. separated from localjump_destination().
* eval.c (break_jump): break innermost loop (or thread or proc).
* eval.c (rb_yield_0): set exit_value for block break.
* eval.c (eval): Only print backtrace if generating the backtrace
doesn't generate an exception. [ruby-core:02621]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@5936 b2dd03c8-39d4-4d8f-98ff-823fe69b080e