I’ve got the following problem: here’s an interfac...

# coroutines

[egorand]

I’ve got the following problem: here’s an interface called `Source`:

interface Source : Closeable {
  @Throws(IOException::class)
  fun read(sink: Buffer, byteCount: Long): Long
}

I’m declaring SuspendingSource like this:

interface SuspendingSource : Source {
  @Throws(IOException::class)
  override suspend fun read(sink: Buffer, byteCount: Long): Long
}

which doesn’t compile because of Conflicting overloads. Is it forbidden to override non-suspend functions with suspend ones?

[Dominaezzz]

Yes, it is forbidden. Since the anyone calling Source.read doesn't not know to suspend.

[egorand]

Ah, makes sense

[Burkhard]

It’s also quite intuitive if you look at the generated bytecode of a suspend function. They work by passing a hidden extra argument which tells the function where to resume.