def why.missing.at

ezx@1.11.0.0 · src/lock/plan.bend:560

import Base

560# no reason when no name is at fault, and the fault's otherwise
561def why.missing.at(none: Bool, reason: Unit -> String) -> String:
562  match none:
563    case True{}:
564      ""
565    case False{}:
566      reason(Unit{})