Differences between lua 4 and 5?

["Huang, Wallace" <whuang@...>]

Hi,

I'm in the process of upgrading my Lua installation from 4 to 5 and have
some questions about differences I ran into.

1) In lua 4.0.1, I was able to make function calls like:
	myFunc
	(
		foo,
		bar,
	)

In Lua 5.0, luac complains on the same code with the error 
"ambiguous syntax (function call x new statement) near `('"
I noticed in the parser that the code is explictly checking for the
function name and parenthesis to be on the same line--is this
intentional?

2) lua_open used to take a stack size argument, and now does not.
Should I worry about lua overflowing its stack, and is there a way I can
limit the memory usage of each lua_State?

3) I ran into the PS2/longjump problem in lua_call in 5, but not 4.
We're using gcc 2.953--should I be concerned?

Thanks,
-W