def only

cswap-bend-cli@0.1.0.0 · json.bend:39

import Base
import cswap-bend-cli@0.1.0.0/json/lex.bend as Lex

39def only(t: List<&2, Lex.Tok>, v: Json) -> Result<&2, &2, String, Json>:
40  match t:
41    case Nil{}:
42      Done{v}
43    case Con{h, r}:
44      Fail{"trailing data after the value"}