fixes #3305; error message will improve with later improvements for concepts
fixes #3305; error message will improve with later improvements for concepts

jsanjuas/Nim,dom96/Nim,tulayang/Nim,endragor/Nim,Dhertz/Nim,sarvex/Nim-lang,msmith491/Nim,jsanjuas/Nim,russpowers/Nim,jfhg/Nim,tulayang/Nim,haiodo/Nim,Dhertz/Nim,endragor/Nim,Matt14916/Nim,tmm1/Nim,mbaulch/Nim,singularperturbation/Nim,tulayang/Nim,sarvex/Nim-lang,msmith491/Nim,zachaysan/Nim,jfhg/Nim,haiodo/Nim,singularperturbation/Nim,dom96/Nim,tmm1/Nim,singularperturbation/Nim,Dhertz/Nim,greyanubis/Nim,greyanubis/Nim,greyanubis/Nim,jsanjuas/Nim,singularperturbation/Nim,msmith491/Nim,nanoant/Nim,zachaysan/Nim,mbaulch/Nim,Dhertz/Nim,russpowers/Nim,haiodo/Nim,nanoant/Nim,sarvex/Nim-lang,tulayang/Nim,jfhg/Nim,tmm1/Nim,dom96/Nim,Matt14916/Nim,dom96/Nim,russpowers/Nim,dom96/Nim,tulayang/Nim,russpowers/Nim,tmm1/Nim,jfhg/Nim,greyanubis/Nim,haiodo/Nim,singularperturbation/Nim,endragor/Nim,russpowers/Nim,mbaulch/Nim,endragor/Nim,Matt14916/Nim,greyanubis/Nim,zachaysan/Nim,sarvex/Nim-lang,Matt14916/Nim,nanoant/Nim,mbaulch/Nim,jfhg/Nim,zachaysan/Nim,msmith491/Nim,haiodo/Nim,zachaysan/Nim,nanoant/Nim,endragor/Nim,mbaulch/Nim,Matt14916/Nim,russpowers/Nim,sarvex/Nim-lang,nanoant/Nim,tmm1/Nim,msmith491/Nim,zachaysan/Nim,jfhg/Nim,Matt14916/Nim,jsanjuas/Nim,dom96/Nim,Dhertz/Nim,russpowers/Nim,greyanubis/Nim,jsanjuas/Nim,tmm1/Nim,Dhertz/Nim,sarvex/Nim-lang,dom96/Nim,nanoant/Nim,singularperturbation/Nim,zachaysan/Nim,Matt14916/Nim,jsanjuas/Nim,tulayang/Nim,endragor/Nim,mbaulch/Nim,jfhg/Nim,msmith491/Nim,tmm1/Nim,haiodo/Nim,singularperturbation/Nim,endragor/Nim,mbaulch/Nim,greyanubis/Nim,haiodo/Nim,sarvex/Nim-lang,Dhertz/Nim,nanoant/Nim,jsanjuas/Nim,msmith491/Nim