Re: [ANN] Lua 5.2.0 (beta-rc1) now available

[Gé Weijers <ge@...>]

On Mon, 13 Jun 2011, Roberto Ierusalimschy wrote:

> > Why break can appear middle of block but not return?
> Because return may be followed by an optional expression. Something
> like 'return a       = 3' would confuse the parser.
There's something to be said for allowing it in the middle of a block if 
it's followed directly by a label:
function foo ()
	.......
	.......
	return 3
@error1:
	print("error1 occurred")
	return nil
@error2:
	print("error2 occurred")
	return nil
end

In this case the expression list after return ends when you either hit end 
or a label.
Algol 68 has a similar construct (the value returned is the value of the 
last expression before END or EXIT):
BEGIN
	.......
	<expression>
EXIT
label:
	.........
	<expression>
END


Gé