Improve WITH-CLOSE-ON-ERROR.
Improve WITH-CLOSE-ON-ERROR.

sionescu/iolib,lispnik/iolib,sionescu/iolib,shamazmazum/iolib,lispnik/iolib,attila-lendvai/iolib,tiago4orion/iolib,tiago4orion/iolib,deadtrickster/iolib,vsedach/iolib-simple-mux,attila-lendvai/iolib,tiago4orion/iolib,lispnik/iolib,deadtrickster/iolib,vsedach/iolib-simple-mux,deadtrickster/iolib,dkochmanski/iolib,dkochmanski/iolib,shamazmazum/iolib,shamazmazum/iolib,sionescu/iolib,dkochmanski/iolib,attila-lendvai/iolib