Re: Lua 5.4 alpha: (yet more) toclose feedback

["Soni \"They/Them\" L." <fakedme@...>]

On 2019-06-23 5:07 p.m., Roberto Ierusalimschy wrote:
> > Firstly, it had initially passed me by that <toclose> is only valid in
> > single-variable local declarations. I'm curious what the rationale for
> > this is, given the widespread use of multiple-return functions,
> > including within 'toclose's primary usage example, io.open().
>
> No specific rationale, it was just easier to implement. We will change
> that.
>
> -- Roberto

I do wonder how <toclose> handles nil, and why it's a bug for <toclose> 
to close a non-closeable value.

consider:

local <toclose> f, err = io.open(foo)
if not f then return nil, err end -- error: attempt to close 
non-closeable value