shared immutable issues

[Enerqi]

Hi

I'm wondering what the state of the language/libraries are with 
regard to shared/immutable qualifiers. I've tried to use 
std.concurrency and had a lot of compile issues passing shared 
data around.
Even a simple case I'm finding issue with:

---------
import std.array;

int main(string[] argv)
{
	shared uint[] arr = stuffone();	
	return 0;
}

shared uint[] stuffone()
{
	shared uint[] arr = new shared (uint[1]);
	arr[0] = 1;	
	return cast(shared)arr;
}

---------
Compile error:
shared.d(6): Error: cannot implicitly convert expression 
(stuffone()) of type uint[] to shared(uint[])
shared.d(15): Error: cannot implicitly convert expression (arr) 
of type shared(uint[]) to uint[]

Another case I couldn't construct an appender to shared data:
---------
import std.array;

int main(string[] argv)
{
	Appender!(shared uint[]) app = std.array.appender!(shared 
uint[]);
	return 0;
}
---------
Compile error:

Error: incompatible types for ((cast(shared(uint)*)arr) is 
(cast(uint*)(*this._data).arr)): 'shared(uint)*' and 'uint*'
shared.d(6): Error: template instance 
std.array.Appender!(shared(uint[])) error instantiating
shared.d(6): Error: constructor 
std.array.Appender!(shared(uint[])).Appender.this (shared(uint)[] 
arr) is not callable using argument types 
(Appender!(shared(uint)[]))
shared.d(6): Error: cannot implicitly convert expression 
(appender(null)) of type Appender!(shared(uint)[]) to 
shared(uint)[]
std\array.d(1878): Error: incompatible types for 
((cast(shared(uint)*)arr) is (cast(uint*)(*this._data).arr)): 
'shared(uint)*' and 'uint*'


Not sure if I'm missing something obvious.
Thanks.