add test for newFileStream() opening a missing file
add test for newFileStream() opening a missing file

mbaulch/Nim,tulayang/Nim,nanoant/Nim,dom96/Nim,sarvex/Nim-lang,singularperturbation/Nim,dom96/Nim,sarvex/Nim-lang,dom96/Nim,Dhertz/Nim,jfhg/Nim,msmith491/Nim,russpowers/Nim,russpowers/Nim,tulayang/Nim,haiodo/Nim,Dhertz/Nim,msmith491/Nim,dom96/Nim,jfhg/Nim,Matt14916/Nim,endragor/Nim,tulayang/Nim,msmith491/Nim,russpowers/Nim,sarvex/Nim-lang,Matt14916/Nim,Matt14916/Nim,singularperturbation/Nim,Dhertz/Nim,Dhertz/Nim,zachaysan/Nim,mbaulch/Nim,endragor/Nim,Dhertz/Nim,haiodo/Nim,endragor/Nim,jfhg/Nim,russpowers/Nim,msmith491/Nim,endragor/Nim,msmith491/Nim,russpowers/Nim,mbaulch/Nim,zachaysan/Nim,haiodo/Nim,singularperturbation/Nim,zachaysan/Nim,jsanjuas/Nim,nanoant/Nim,zachaysan/Nim,nanoant/Nim,russpowers/Nim,sarvex/Nim-lang,dom96/Nim,msmith491/Nim,jfhg/Nim,nanoant/Nim,russpowers/Nim,sarvex/Nim-lang,mbaulch/Nim,nanoant/Nim,Matt14916/Nim,jsanjuas/Nim,nanoant/Nim,msmith491/Nim,sarvex/Nim-lang,tulayang/Nim,singularperturbation/Nim,jfhg/Nim,mbaulch/Nim,tulayang/Nim,zachaysan/Nim,Matt14916/Nim,mbaulch/Nim,haiodo/Nim,jfhg/Nim,endragor/Nim,singularperturbation/Nim,Dhertz/Nim,haiodo/Nim,Matt14916/Nim,dom96/Nim,jsanjuas/Nim,sarvex/Nim-lang,jsanjuas/Nim,jfhg/Nim,dom96/Nim,endragor/Nim,jsanjuas/Nim,singularperturbation/Nim,Matt14916/Nim,zachaysan/Nim,zachaysan/Nim,Dhertz/Nim,jsanjuas/Nim,endragor/Nim,haiodo/Nim,tulayang/Nim,haiodo/Nim,mbaulch/Nim,singularperturbation/Nim,jsanjuas/Nim,nanoant/Nim