I’m trying to use a Completion Handler block as an argument for a Cocoa 
AVMIDIPlayer method:

midiPlayer = 
AVMIDIPlayer.alloc().initWithContentsOfURL_soundBankURL_error_(midiFile, None, 
None)
midiPlayer.prepareToPlay()
midiPlayer.play_(myCompletionHandler)

But I get:

Argument 2 is a block, but no signature available

From what I can find out, this points to a bit in the metadata of PyObjC that 
needs a bit of work. Is that the case?

I’m using the default version 2.5.1 bundled with MacOS.

Thanks

Ben
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