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[SR-9690] [Sema] Differentiable derivation for generic type #52131

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dan-zheng opened this issue Jan 17, 2019 · 1 comment
Closed

[SR-9690] [Sema] Differentiable derivation for generic type #52131

dan-zheng opened this issue Jan 17, 2019 · 1 comment
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@dan-zheng
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. swift for tensorflow

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@dan-zheng
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Previous ID SR-9690
Radar None
Original Reporter @dan-zheng
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Swift for TensorFlow
Labels Bug
Assignee @dan-zheng
Priority Medium

md5: 73821f74532f4fb44765a55487f5966b

Issue Description:

struct Foo<Scalar : FloatingPoint & Differentiable> : Differentiable {
  var x: Float
}
// <unknown>:0: error: type of expression is ambiguous without more context

Scary diagnostic, but I think I know the solution. Need to propagate substitution map from nominal type to various ConcreteDeclRefs in synthesized expressions.
@dan-zheng
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Fixed in #21995
The issue was actually that derived setters didn't inherit their parent's generic environment.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@dan-zheng dan-zheng

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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. swift for tensorflow
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@dan-zheng