def missing

ezx@1.11.0.0 · src/doctor/plan.bend:283

import Base

283# the strings of `xs` that `known` does not hold
284def missing(xs: List<&2, String>, +known: List<&2, String>) -> List<&2, String>:
285  match xs:
286    case []:
287      []
288    case +h <> t:
289      missing.put(has(known, h), h, missing(t, known))