Dan Zheng e3938b5c7d [AutoDiff] Fix Array.append(_:) pullback. ...

The derivative wrt `self` should drop the last element from the incoming seed.

Example:
- Incoming seed: [1, 2, 3, 4]
- Derivative wrt `self`: [1, 2, 3]
- Derivative wrt appended element: 4

2020-05-14 09:27:50 -07:00

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