Re: Documentation for multiple assignment fails to mention order

[Dirk Laurie <dirk.laurie@...>]

2016-07-25 18:28 GMT+02:00 Niccolo Medici <niccolomedici@gmail.com>:
> On 7/25/16, Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> wrote:
>> > The documentation for multiple assignment (section "3.3.3 –
>> > Assignment" in the manual) doesn't mention the fact the assignment is
>> > *not* carried out in order.
>> > <snip>
>> > BTW, is it guaranteed that the assignment order goes from RIGHT to
>> > LEFT (I verified this in Lua 5.1, 5.2, 5.3, LuaJIT), or is it
>> > "undefined behavior"?
>>
>> It is not undefined behavior at all.
>> <snip>
>> It is like in C, which does not specify the order of evaluation of
>> expressions in argument lists in function calls.

> You actually prove my point here.
...
> You give two reasons.
>
> First, you say "it's implementation detail". That's no reason to not
> state that it's "unspecified behavior".
>
> Second, you say "this allows us to change the implementation". Again:
> that's no reason to not state that it's "unspecified behavior".
...
> And that's wrong too.

I am not easily shocked, but this response by an OP to a reply by
a member of the Lua team is some of the worst trolling I have ever
seen on any mailing list.