Ambiguous use of 'initialize(fromContentsOf:)' in UnsafeMutableBufferPointer+Extras.Slice

[JessyCatterwaul]

Collections doesn't compile with the first Xcode 16 beta.

UnsafeMutableBufferPointer+Extras has an Ambiguous use of 'initialize(fromContentsOf:)' error.

How should we get around this?

Information

• Package version: main
• Platform/Swift version: swift-driver version: 1.109.2 Apple Swift version 6.0 (swiftlang-6.0.0.3.300 clang-1600.0.20.10)
  Target: arm64-apple-macosx14.0

Checklist

• ☑️ If possible, I've reproduced the issue using the main branch of this package.
• ☑️ I've searched for existing GitHub issues.

[JessyCatterwaul]

I see that this has gotten 6 thumbs ups, so it can't just be me, but haven't been able to whittle this down to what's minimally necessary to reproduce the problem.

[lorentey]

I haven't been able to locally reproduce this, however, this is the sort of source break that can be triggered by SE-0437.

SE-0437 did not generalize the standard initialize(fromContentsOf:) functions, though -- I'd expect such source compat regressions to only affect entry points that did get generalized. However, there may be some undiagnosed compiler regression.

If you're still seeing this with the current dev snapshots (and/or Xcode betas), reproduction steps would be very welcome. Please include the precise toolchain versions that exhibit the issue, as well as the raw compiler output, including verbatim copies of all diagnostic messages.