def sym.fresh
import bend-kit-regex@0.8.0.0/regex.bend as Regeximport Base
1642def sym.fresh(xs: List<&2, Op>) -> Bool:
1643 match xs:
1644 case Nil{}:
1645 True{}
1646 case Con{Op{+src, pc, saves}, t}:
1647 U32.is_eq(src, seed.id()) && sym.fresh(t)