Re: Yet another proposal for <toclose> (was Re: [ANN] Lua 5.4.0 (alpha) now available)

[Sergey Kovalev <kovserg33@...>]

> The proposed 'defer' statement looks like this:
>
> defer ... end
>
> with the guarantee that f will be invoked at scope exit.
>
Can be done following way:

scope(function(auto) local defer=function(fn) auto(fn){true} end

    defer(function() print "defer1" end)
    defer(function() print "defer2" end)

end)

> 5) Variables may be captured as upvalues in the function too
Main problem of upvalues is: there is no effective way to isolate
function body from upvalues in lua.