Errata in PIL4 on page 86

[Rob Edmunds <sheeponmintsauce@...>]

Hello,

I think I have found an error in the code on page 86. It states:

function rest (left, right, bottom, up)

return function (x, y)

return left <= x and x <= right and

bottom <= x and x <=up

end

end

I assume the "bottom <= x and x <=up" should actually be "bottom <= y and y <=up". I thought I would send this to you, incase you need it for the errata list.

Thank you for this fantastic book, I am really enjoying it. Keep up the great work!