std.concurrency bug?

[Ali Çehreli via Digitalmars-d-learn]

On 05/20/2014 11:38 AM, Charles Hixson via Digitalmars-d-learn wrote:
> Is it a bug that an immutable struct cannot be sent to a thread?  (It compiles
> without problem if I make all elements mutable.)

Does the struct have any mutable indirection? Then it is illegal. 
Otherwise, can you demonstrate with minimal code please?

Ali