sequences.extras: fix test for arg-where.
sequences.extras: fix test for arg-where.

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