pickBestCandidate: pre-calculate candidates when symbol table modified
pickBestCandidate: pre-calculate candidates when symbol table modified

dom96/Nim,mbaulch/Nim,tulayang/Nim,singularperturbation/Nim,jfhg/Nim,dom96/Nim,singularperturbation/Nim,russpowers/Nim,haiodo/Nim,singularperturbation/Nim,tulayang/Nim,russpowers/Nim,singularperturbation/Nim,singularperturbation/Nim,jfhg/Nim,russpowers/Nim,russpowers/Nim,haiodo/Nim,mbaulch/Nim,haiodo/Nim,jfhg/Nim,russpowers/Nim,tulayang/Nim,jfhg/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,mbaulch/Nim,jfhg/Nim,singularperturbation/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim,mbaulch/Nim,haiodo/Nim,haiodo/Nim,haiodo/Nim,jfhg/Nim,singularperturbation/Nim,mbaulch/Nim,tulayang/Nim,mbaulch/Nim,jfhg/Nim,russpowers/Nim,haiodo/Nim,mbaulch/Nim,tulayang/Nim