def SafeAt

minebender-game@1.0.0.0 · proof_assist.bend:30

import Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/board.bend as B
import minebender-game@1.0.0.0/game.bend as G

30def SafeAt(+layout: T.Grid(Bool), +shown: T.Grid(Bool), +ps: List<&2, T.Pos>) -> Type:
31  Exists(T.Pos, p => {G.first_safe(layout, shown, ps) == Some{p} : Maybe<&2, T.Pos>} &
32    ({Bool.and(Bool.not(B.mine(layout, p)), Bool.not(B.at(Bool, False{}, shown, p))) == True{} : Bool} &
33     {B.contains(ps, p) == True{} : Bool}))