ProofAssist.all_safe_append: law of minebender-game@1.0.0.0
Import: import minebender-game@1.0.0.0/proof_assist.bend as ProofAssist
Lines 88-94 of minebender-game@1.0.0.0/proof_assist.bend: https://jend.leeeet.dev/read.txt?path=minebender-game@1.0.0.0/proof_assist.bend&start_line=88&end_line=94

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

law all_safe_append:
  for +layout: T.Grid(Bool)
  for +shown: T.Grid(Bool)
  for +xs: List<&2, T.Pos>
  for +ys: List<&2, T.Pos>
  for e: {G.all_safe.go(layout, shown, ys) == False{} : Bool}
  {G.all_safe.go(layout, shown, List.append(&2, T.Pos, xs, ys)) == False{} : Bool}

Uses (12):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.or
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=at
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=mine
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/game.bend&name=all_safe.go
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_base.bend&name=and_false_r
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Grid
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Pos