Board.set_at: def of minebender-game@1.0.0.0
Import: import minebender-game@1.0.0.0/board.bend as Board
Lines 106-111 of minebender-game@1.0.0.0/board.bend: https://jend.leeeet.dev/read.txt?path=minebender-game@1.0.0.0/board.bend&start_line=106&end_line=111

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

# The grid g with the cell at p replaced by v (unchanged when p is off it).
def set_at(-A: Data, +g: T.Grid(A), p: T.Pos, v: A) -> T.Grid(A):
  match p:
    case T.Pos{x, +y}:
      row = Maybe.default(&2, List<&2, A>, List.get(&2, List<&2, A>, g, y), Nil{})
      List.set(&2, List<&2, A>, g, y, List.set(&2, A, row, x, v))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.get
  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.default
  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