Re: Send data structures between threads?

[Araq]

We don't really want to have a Nim dialect per --gc option so the frontend 
checking is not aware of `--gc:boehm`. You can `cast` GC safety into existance 
though and be as dirty as Boehm allows for.

Sketch:
    
    
    type EnforcedGcSafe = proc() {.gcsafe.}
    
    proc myproc =
      discard "... access shared heap here..."
    
    spawn cast[EnforcedGcSafe](myproc)