def string.contains
import gralha-text-scan@0.1.0.1/scan.bend as Scanimport Base
268def string.contains(+s: String, +part: String) -> Bool:
269 match s:
270 case SNil{}: string.equal(part, "")
271 case SCon{c, rest}: prefix(s, part) || string.contains(rest, part)