Swift fails to compile enum with recursive type reference

Originator:jlieske
Number:rdar://17225563 Date Originated:08-Jun-2014 04:23 PM
Status:Duplicate Resolved:
Product:OS X SDK Product Version:Xcode6 beta: Version 6.0 (6A215l)
Classification:Crash Reproducible:Always
 
The Swift language supports enums with type parameters for associated values.  Such enum types should support recursive relationships, such as the classic linked list.  

For example, this seems to be a reasonable enum declaration:

enum List<T> {
    case Nil
    case Cons(T, List<T>)
}

However, it fails to compile in Swift source code files.  The compiler reports the error:

<unknown>:0: error: unable to execute command: Segmentation fault: 11
<unknown>:0: error: swift frontend command failed due to signal (use -v to see invocation)
Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254

Furthermore, pasting that class definition in a Playground file causes Xcode to crash.  When Xcode tries to re-launch with the Playground file with the definition, it crashes repeatedly.

Comments

Apple closed as duplicate of rdar://17100336

By jlieske at June 21, 2014, 7:43 p.m. (reply...)

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