Unable To Append Two Emoji Strings On macOS Ventura's Swift

[brianmichel]

Description
Appending two emoji strings together crashes on macOS Ventura

Steps to reproduce

1. Use macOS Ventura
2. Run the sample package's tests or
3. try to execute the code "⛓".appending("🦑") in the Swift repl

Expected behavior
This code should run and execute fine producing a string that is equal to "⛓🦑"

Actual behavior
This works correctly on macOS Monterey, but crashes on macOS Ventura with the message Swift/StringUTF16View.swift:144: Fatal error: String index is out of bounds

Environment

• Swift compiler version info
  -- swift-driver version: 1.62.15 Apple Swift version 5.7.2 (swiftlang-5.7.2.135.5 clang-1400.0.29.51)
  -- Target: arm64-apple-macosx13.0
• Xcode version info
  -- Xcode 14.2
  -- Build version 14C18
• Deployment target: macOS 11

Sample Project
FuzzyMatchingPackage.zip

[WowbaggersLiquidLunch]

I'm not able to reproduce the error. Could there be some bugs in your appending function? The standard library has only append functions.

[amonshiz]

appending is in the StringProtocol. https://developer.apple.com/documentation/swift/stringprotocol/appending(_:)

[danielpunkass]

FWIW I also am not able to reproduce the crash on Xcode Version 14.2 (14C18). Ventura 13.2.1 (22D68). (swiftlang-5.7.2.135.5 clang-1400.0.29.51)

[brianmichel]

I'm going to close this for now since it feels like we're missing a step somewhere in the repro (or some specific machine configuration).

[AnthonyLatsis]

appending is in the StringProtocol.

Yes, but regrettably the documentation does not mention that the function is declared in Foundation, not the Standard Library.

@brianmichel Does "⛓".appending("🦑") crash in the REPL by itself, or after importing Foundation?