[nem-en] patch for matching compiler

[Kamil Skalski]

05-10-24, Marcin Grzeskowiak <fnord at silesianet.pl> napisał(a):
> Two more things:
> 1) my patch should close bug 534

Correct

> 2) I am not sure if this is intentional or a bug but I had some problems
> with constructors in variants that contain constant options, e.g.:

Yes, this is a bug. If there is a field in variant, then empty variant
options should behave just like those with some elements (they are not
optimized to use a singelton through whole app execution)

>
> variant V
> {
>   A { v : V; }
>   B
>
>   public x : int;
>
>   public this ()
>   {
>     x = -1;
>   }
> }
>
> The constructor is called each time V.A () is instantiaded but only once
> for V.B ().
> In DecisionTreeBuilder.n I had this problem with Decision.Failure and
> I handled this by adding unused field to the option (but it took me
> some time to find out why my code isn't working).
>
> Marcin
>
> PS. sorry if my posts are outside the thread but currently I can't
> use any mail client to send them
>
>
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--
Kamil Skalski
http://nazgul.omega.pl