2dup swap leader-map get set-at coalesce-elements ;
: vregs-interfere? ( vreg1 vreg2 -- merged/f ? )
- [ class-element-map get at ] bi@ sets-interfere? ;
+ class-element-map get '[ _ at ] bi@ sets-interfere? ;
ERROR: vregs-shouldn't-interfere vreg1 vreg2 ;