LinkTerminated without linked thread?

[Stephan]

Hi,

I am getting totally confused by Exceptions and Multi-threading 
with std.concurrency.
I have a simple setup:
     - the main thread spawns several child-threads
     - each child-thread performs a task
     - each child-thread sends their result back to the main 
thread and finishes.
     - the main thread uses receiveOnly to get the message.

To spawn the child-threads I use spawn, not spawnLinked. 
Nevertheless, in all runs, at some point the program finishes 
with an uncaught LinkTerminated exception!
I am confused, because I thought, that LinkTerminated can only 
happen if the child-threads are started with spawnLinked. In 
small test programs, I don't get LinkTerminated exceptions if a 
child thread crashes. So my first question is: Where does the 
LinkTerminated Exception come from, when the only functions from 
std.concurrency that I use are "spawn" and "receiveOnly".

My second question: Given that spawn works as documented and 
expected: How can I report an Error or an Exception thrown in a 
child-thread? Should I wrap the whole function that is spawned in 
a try-catch statement to print any exception manually?

Thanks for any clarification!

Stephan