Created attachment 144995 [details]
Test case

The output of this test program is:

0
0
1
0
2
0
3
0
4
0

Actually, it should be the numbers 0 to 9

Hmm. Works for me (x86, vala from git). Please provide your architecture and vala version.

% cat test.vala 
using Gee;

static void main (string[] args) {

	ArrayList<uint> l = new ArrayList<uint> ();
	
	for (int i=0; i<10; i++) l.add(i);

	uint[] a = (uint[])l.to_array ();
	foreach (uint i in a) stdout.printf ("%u\n", i);
}
% valac --vapidir ../gee --pkg gee-1.0 test.vala
% ./test 
0
1
2
3
4
5
6
7
8
9

Ops. I forgot to ask:
- Does all tests run correctly
- Does it runs ok with vala from git

I'm using vala from git (a3327d98475f66a01b16e990faa6b836ab6d6c73).
The tests do pass fine.

Forgot to mention, my architecture is 64bit.

(In reply to comment #5)
> Forgot to mention, my architecture is 64bit.

Ok. I'll check the case on 64-bits. However as I need to access a shared shell account at university I need to ask for permission first.

May be other developer (if I can call myself a libgee dev) will respond quicker but I haven't seen them recently.

Ok. I reproduced with char. IMHO vala tries to threat G[] as (sizeof(void *))[] - which in some cases (char, *int on 64-bit system etc.) is wrong. 

I belive it's vala bug but I'll do furthr invastigation if it should be workaround in libgee or vala.

Known limitation of generics support, see bug 568972.

I have a workaround for some months in my local repository, but I hesitate to push it because:
1) It is a dirty hack; that workaround is using private to_array variants for all the possible primitive types
2) Valac still requests for the (primitive-type[]) cast

Please tell me your opinion whether you think it would be worth it to:
1) add the workaround to make it work whatever type G is,
2) or document that it can't work for primitive types

If the bug in Vala isn't fixed soon, I'd prefer the workaround.

BTW: The cast is not necessary anymore in Vala master. However, it's still only working for pointer-based element types without hack due to limitations of the pointer based generics API. It is working properly in the experimental dova backend.

commit 3199e7a5d999cc5b3120593f073d4a39943b6ef1
Author: Didier 'Ptitjes <ptitjes@free.fr>
Date:   Mon Aug 2 16:50:39 2010 +0200

    Implement typed variants for Collection.to_array
    
    Fixes bug 597737.