Shouldn't spawn work with __gshared?

[Andrej Mitrovic]

Before you give me a lecture on thread safety, sometimes I have to test code 
on-the-fly and __gshared comes in really handy when working with C codebases.

Now, here's something that won't fly:

import std.concurrency;

class Foo { }
__gshared Foo foo;

void main()
{
    foo = new Foo();
    
    spawn(&bar, foo);
}

void bar(ref Foo)
{
}

Error:
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\concurrency.d(326): Error: static 
assert  "Aliases to mutable thread-local data not allowed."
spawnGshared.d(13):        instantiated from here: spawn!(Foo)

foo isn't thread local.

bar could use the global directly, yes, but this was just a test case. In my 
real code the bar function is defined in a different module and doesn't see the 
foo instance since it's in module scope of the main module.

Anyway, yeah I'll translate this to a thread-safe version, of course. But this 
looks like a bug to me.