debugger: change vm-errors to use nth instead of at.
debugger: change vm-errors to use nth instead of at.

slavapestov/factor,slavapestov/factor,tgunr/factor,AlexIljin/factor,slavapestov/factor,bjourne/factor,factor/factor,bpollack/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,mrjbq7/factor,sarvex/factor-lang,slavapestov/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,bjourne/factor,tgunr/factor,slavapestov/factor,mrjbq7/factor,dch/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,sarvex/factor-lang,sarvex/factor-lang,tgunr/factor,AlexIljin/factor,factor/factor,bjourne/factor,factor/factor,slavapestov/factor,dch/factor,nicolas-p/factor,nicolas-p/factor,sarvex/factor-lang,factor/factor,bpollack/factor,dch/factor,nicolas-p/factor,sarvex/factor-lang,mrjbq7/factor,bjourne/factor,AlexIljin/factor,slavapestov/factor,sarvex/factor-lang,nicolas-p/factor,bpollack/factor,bpollack/factor,tgunr/factor,nicolas-p/factor,dch/factor,tgunr/factor,dch/factor,bjourne/factor,sarvex/factor-lang,AlexIljin/factor,AlexIljin/factor,dch/factor,AlexIljin/factor,nicolas-p/factor,bjourne/factor,nicolas-p/factor