[AutoDiff] fix array subscript lookup when there are multiple #31723
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@swift-ci please test |
dan-zheng
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May 12, 2020
rxwei
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May 12, 2020
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Jun 3, 2020
…ang#31723) Fix `PullbackEmitter::getArrayAdjointElementBuffer` to always lookup `Array.TangentVector.subscript` from the stdlib. Resolves compiler crash when user code also defines `Array.TangentVector.subscript`.
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The differentiation transform sometimes tries to call the wrong subscript when there are multiple subscripts.
This concretely causes problems when you
import TensorFlowbecause this subscript has different conformances in its generic signature than the correct subscript, so you get an assertion failure while trying to construct a substitution map for it: