[WordSeg] Fix pullback for Array.update(at:to:).
#653
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The pullback of `Array.update(at:to:)` resets `dSelf.base[index]` to a zero value. For correctness, it should use the value of `self[index].zeroTangentVector` before the update occurs, not `dElement.zeroTangentVector`.
marcrasi
approved these changes
Jul 31, 2020
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The pullback of
Array.update(at:to:)resetsdSelf.base[index]to a zero value.For correctness, it should use the value of
self[index].zeroTangentVectorbeforethe update occurs, not
dElement.zeroTangentVector.Fixes
WordSegProbeLayerTests.testProbeEncoderafter the2020-07-28 master -> merge.Previously, the test passed due to an incorrect definition of
Array.TangentVector.zeroTangentVectorInitializer, which was fixed in swiftlang/swift#32948.