Re: Weird bug for default constructor

[Per Bothner <per at bothner dot com>]

Kjetil Svalastog Matheussen wrote:
> Hi,
>
> When compiling the code below with "kawa -C c_image.scm" I get the 
> following error:
>
> [kjetism@iannis src]$ kawa -C bug.scm

I checked in a fix for this.

> I can not guarantee that you are able to reproduce it, because it seems
> to be rather random when the internal error strikes or not. But I hope
> that this example is reproducable...

The bug happens when the class needed to refer to a non-static
component of the surrounding module, but the init method did not
do so itself.  However, in that case the init method still needs
an implicit static link parameter, so the class's static-link ("this$0")
field can be initialized.

> I won't be surprised if its related to the garbage collector either, 
> since I had so much trouble making a reproducable example.

Nope.

> Or, perhaps I have just screwed up something. Hopefully someone tells me 
> if I have done something obviously stupid.

Nope.

> Also, is there any "super" kind of function available? Because then 
> I can get away with only one constructor. (<c_image> is a superclass)

http://www.gnu.org/software/kawa/Defining-new-classes.html discusses
this.  Basically, you need to use invoke-special.
--
	--Per Bothner
per@bothner.com   http://per.bothner.com/