def fmt.named

cswap-bend-cli@0.1.0.0 · setimp.bend:54

import Base

54def fmt.named(m: Maybe<&2, String>, +n: String) -> Result<&2, &2, String, String>:
55  match m:
56    case Some{f}:
57      Done{f}
58    case None{}:
59      Fail{"unknown format '" ++ n ++ "' (json, yaml, toon, csv)"}