def String.repeat
import Base2220def String.repeat(+s: String, n: Nat) -> String:
2221 match n:
2222 case 0n:
2223 SNil{}
2224 case 1n+p:
2225 String.append(s, String.repeat(s, p))
import Base2220def String.repeat(+s: String, n: Nat) -> String:
2221 match n:
2222 case 0n:
2223 SNil{}
2224 case 1n+p:
2225 String.append(s, String.repeat(s, p))