rework extract_argument code to populate holders as intermediate values
#5742
+844
−373
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This is an experiment to use type inference & "holders" to change the
extract_argumentcode to no longer need to take&mut holderinputs to argument extraction but instead produce holders as outputs from extraction. The holders then have a subsequent "unpack" phase.I think this might enable error messages for unimplemented
PyFunctionArgumentto look a bit nicer, I'm going to play with that shortly. Pushing now to see what the pipeline thinks.Will update this PR with a more detailed description as the code takes shape...