def field_source
import cli@0.2.0.0/cli.bend as Cliimport Base
3913def field_source(fields: List<&2, Field>, +id: String) -> Src:
3914 match fields:
3915 case Nil{}: Absent{}
3916 case Field{key, values, source} <> tail:
3917 Bool.pick(Src, String.eq(key, id), source,
3918 field_source(tail, id))