ProofDisplay.mark_ok: law of minebender-game@1.0.0.0
Import: import minebender-game@1.0.0.0/proof_display.bend as ProofDisplay
Lines 251-255 of minebender-game@1.0.0.0/proof_display.bend: https://jend.leeeet.dev/read.txt?path=minebender-game@1.0.0.0/proof_display.bend&start_line=251&end_line=255

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

# What the end of the game singles out is never covered.
law mark_ok:
  for +st: T.Status
  for +p: T.Pos
  {Maybe.default(&2, Bool, Maybe.map(&2, T.Tile, Bool, t => L.is_covered(t), G.mark(st, p)), False{}) == False{} : Bool}

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe.default
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe.map
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/LAWS.bend&name=is_covered
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/game.bend&name=mark
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_display.bend&name=mark_ok.why
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Pos
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Status
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/types.bend&name=Tile