ruby/ruby — pull request #608 by nobu (2014-05-06 09:51:58+00:00)
Title: Backtrace for SystemStackError

* eval.c (setup_exception): set backtrace in system stack error
other than the pre-allocated sysstack_error. [Feature #6216]

* proc.c (Init_Proc): freeze the pre-allocated sysstack_error.

* vm_insnhelper.c (vm_stackoverflow): raise new instance for each
times without calling any methods to keep the backtrace with no
further stack overflow.