Issue 4490: Added thread name to IO.debug

[alstepan]

An implementation for #4409

[durban]

Thanks for the PR. I'm wondering, what is the intention here? To print which thread exactly?

[asarkar]

@durban Not sure I understand your question, Thread.currentThread returns the currently executing thread, no?

[durban]

Sure, but which thread, executing what code, when? The thread writing to stdout? The thread executing this: IO[A]? The thread executing the closure in the guaranteeCase? (Again, I'm asking for the intention here.)

[asarkar]

The thread in guaranteeCase as shown in the ticket.

[asarkar]

The intent is to add thread name to prefix wherever it appears.