error.c: rb_get_backtrace
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56766 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
error.c: rb_get_backtrace
exc_backtrace directly. [ruby-core:78097] [Bug #12925]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56766 b2dd03c8-39d4-4d8f-98ff-823fe69b080e