Warning: this is an htmlized version!
The original is across this link,
and the conversion rules are here.
Lua 5.1.5  Copyright (C) 1994-2012 Lua.org, PUC-Rio
> dofile "newrect.lua"
> = lr"00"      -- err?
./picture.lua:91: attempt to perform arithmetic on local 'r' (a nil value)
stack traceback:
	./picture.lua:91: in function <./picture.lua:89>
	(tail call): ?
	(tail call): ?
	[C]: ?
> = lr"10"      -- err?
./picture.lua:91: attempt to perform arithmetic on local 'r' (a nil value)
stack traceback:
	./picture.lua:91: in function <./picture.lua:89>
	(tail call): ?
	(tail call): ?
	[C]: ?
> = lr"03"      -- err?
./picture.lua:91: attempt to perform arithmetic on local 'r' (a nil value)
stack traceback:
	./picture.lua:91: in function <./picture.lua:89>
	(tail call): ?
	(tail call): ?
	[C]: ?
> = lr"03":s()  -- err?
./picture.lua:91: attempt to perform arithmetic on local 'r' (a nil value)
stack traceback:
	./picture.lua:91: in function <./picture.lua:89>
	(tail call): ?
	stdin:1: in main chunk
	[C]: ?
> 
>