Xcode 9 beta 4: compiler crash when querying \NSLayoutConstraint.firstItem as key path

Originator:igeek1
Number:rdar://33743416 Date Originated:06-Aug-2017 03:18 AM
Status:Resolved Resolved:August 9 2017, 12:53 PM
Product:Developer Tools Product Version:swiftlang-900.0.54.11 clang-900.0.31
Classification:Crash/Hang/Data Loss Reproducible:Always
 
Summary:
Attempting to use \NSLayoutConstraint.firstItem in Swift will cause the compiler to crash.

Steps to Reproduce:
1. Open Terminal.
2. Enter the Swift REPL by typing `swift`.
3. Type `import AppKit`.
4. Type `\NSLayoutConstraint.firstItem`.

Expected Results:
The REPL prints the resulting KeyPath value for the specified property, firstItem.

Actual Results:
Segfault. See attached crash log, also uploaded at https://cl.ly/lsp3

Version:
swiftlang-900.0.54.11 clang-900.0.31

Notes:
No crash on \NSLayoutConstraint.firstAttribute.

Comments

Apple Developer Relations

We believe this issue is resolved in the latest Xcode 9 beta.

Please test with the latest Xcode beta. If you still have issues, please update your bug report with any relevant logs or information that could help us investigate.

By igeek1 at Aug. 9, 2017, 10:06 p.m. (reply...)

Cross-posted at https://bugs.swift.org/browse/SR-5634

By igeek1 at Aug. 6, 2017, 7:46 a.m. (reply...)

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