CreateThread doesn't accept functions with generics

[AzureKitsune]

My code -> https://gist.github.com/1110749 (although, the code was altered for issue #42)
When you try to pass a function to createThread, if it depends on generics for one of its arguments, the compiler will not accept it.

parallel.nim(24, 17) Error: type mismatch: got (TThread[TThreadFuncArgs[int]], proc(TThreadFuncArgs[int]), TThreadFuncArgs[int])
but expected one of:
createThread(t: var TThread[TMsg], tp: proc (TMsg){.thread.}, param: TMsg)
createThread(t: var TThread[TMsg], tp: proc (){.thread.})