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[SR-14230] [AutoDiff] Inaccurate "multiple semantic results" non-differentiability error message #54805

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dan-zheng opened this issue Mar 16, 2020 · 0 comments
Open

[SR-14230] [AutoDiff] Inaccurate "multiple semantic results" non-differentiability error message #54805

dan-zheng opened this issue Mar 16, 2020 · 0 comments
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AutoDiff bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@dan-zheng
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Previous ID SR-14230
Radar None
Original Reporter @dan-zheng
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, AutoDiff
Assignee None
Priority Medium

md5: afd42d76551ecd8ba4f89d79f4f66ddf

Issue Description:

@differentiable
func foo<T: Differentiable>(_ x: T, _ result: inout T, _ y: inout T) {}
inout.swift:1:2: error: cannot differentiate functions with both an 'inout' parameter and a result
@differentiable
 ^

The message is inaccurate because the original function has no result.

The message should say something like "cannot differentiate functions with more than one total 'inout' parameter and result".
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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AutoDiff bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@dan-zheng