[Issue 13930] std.concurrency can't send immutable AA to another thread

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13930

Tomoya Tanjo <ttanjo at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ttanjo at gmail.com

--- Comment #3 from Tomoya Tanjo <ttanjo at gmail.com> ---
I guess this issue contains two distinct problems.

The example in the first comment is about the problem of the `send` function.
I guess it was already solved by issue 21296 because the following test works
without errors (I used phobos commit:f85ca8db in which issue 21296 was fixed):

```
@system unittest
{
    immutable aa = ["0":0];
    thisTid.send(aa);    
}
```


The example in the second comment is about the problem of the `receiveOnly`
function (same as issue 19345).
This problem only happens with `receiveOnly` but does not happen with other
`receive` family such as `receive` and `receiveTimeout`.
I confirmed the following tests work without errors (I used phobos
commit:f85ca8db):

```
@system unittest
{
    immutable aa = ["0":0];
    thisTid.send(aa);
    receive((immutable int[string] val) {});
}

@system unittest
{
    immutable aa = ["0":0];
    thisTid.send(aa);
    receiveTimeout(10.seconds, (immutable int[string] val) {});
}
```

Note: I did not test the case of shared.

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