law first_safe_some
import minebender-game@1.0.0.0/proof_assist.bend as ProofAssistimport Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/game.bend as G
68# While some safe cell is unrevealed, first_safe finds one.
69law first_safe_some:
70 for +layout: T.Grid(Bool)
71 for +shown: T.Grid(Bool)
72 for +ps: List<&2, T.Pos>
73 for e: {G.all_safe.go(layout, shown, ps) == False{} : Bool}
74 SafeAt(layout, shown, ps)