Fix Kernel#instance_variables to prefix vars with '@'
Fix Kernel#instance_variables to prefix vars with '@'

catprintlabs/opal,Ajedi32/opal,Flikofbluelight747/opal,opal/opal,merongivian/opal,kachick/opal,c42engineering/opal,merongivian/opal,Ajedi32/opal,catprintlabs/opal,wied03/opal,castwide/opal,kachick/opal,wied03/opal,castwide/opal,jannishuebl/opal,merongivian/opal,kachick/opal,fazibear/opal,fazibear/opal,domgetter/opal,kachick/opal,iliabylich/opal,iliabylich/opal,suyesh/opal,jannishuebl/opal,gausie/opal,bbatsov/opal,Ajedi32/opal,Flikofbluelight747/opal,iliabylich/opal,Mogztter/opal,jannishuebl/opal,wied03/opal,opal/opal,Mogztter/opal,jgaskins/opal,opal/opal,domgetter/opal,suyesh/opal,Flikofbluelight747/opal,gausie/opal,gabrielrios/opal,c42engineering/opal,opal/opal,gausie/opal,bbatsov/opal,jgaskins/opal,bbatsov/opal,catprintlabs/opal,suyesh/opal,Mogztter/opal,fazibear/opal,castwide/opal,Mogztter/opal,gabrielrios/opal,jgaskins/opal,gabrielrios/opal,c42engineering/opal