ProofSpeed.true_set_f: law of minebender-game@1.0.0.0
Import: import minebender-game@1.0.0.0/proof_speed.bend as ProofSpeed
Lines 203-213 of minebender-game@1.0.0.0/proof_speed.bend: https://jend.leeeet.dev/read.txt?path=minebender-game@1.0.0.0/proof_speed.bend&start_line=203&end_line=213

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/solver.bend as S

# ... and none otherwise.
law true_set_f:
  for +w: Nat
  for +h: Nat
  for +part: T.Grid(Maybe<&2, Bool>)
  for +x: Nat
  for +y: Nat
  for +sh: {B.shaped(Maybe<&2, Bool>, w, h, part) == True{} : Bool}
  for +on: {B.on_board(w, h, T.Pos{x, y}) == True{} : Bool}
  for +fr: {S.look(part, T.Pos{x, y}) == None{} : Maybe<&2, Bool>}
  {S.part_true(B.set_at(Maybe<&2, Bool>, part, T.Pos{x, y}, Some{False{}})) == S.part_true(part) : Nat}

Uses (16):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.set
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=on_board
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=set_at
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/board.bend&name=shaped
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_lists.bend&name=row_of
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_speed.bend&name=cell_none
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_speed.bend&name=row_get
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_speed.bend&name=row_true_set_f
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/proof_speed.bend&name=true_go_f
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/solver.bend&name=look
  https://jend.leeeet.dev/definition.txt?path=minebender-game@1.0.0.0/solver.bend&name=part_true
  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