Swift: EXC_BAD_ACCESS at runtime in nonrecursive left fold

Originator:rix.rob
Number:rdar://18548244 Date Originated:04-Oct-2014 05:37 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode-6.1 (6A1042b)
Classification:Serious Bug Reproducible:Always
 
Summary:
I’m implementing a nonrecursive left fold as a protocol (ReducibleType) and a helper type ReducibleOf for reducing SequenceType. It crashes at runtime in what I believe is a language bug (since there’s no message logged indicating that it’s an error in my code).


Steps to Reproduce:
1. Go get this repo & branch: https://github.com/robrix/Traversal/pull/1
2. Run the tests.


Expected Results:
I expected the tests to complete, possibly even to succeed.


Actual Results:
Instead, the tests hit an EXC_BAD_ACCESS. Even better, trying to `bt` in the debugger crashes Xcode. (I submitted the crash log with the details from the crash reporter window.)


Regression:
N/A


Notes:
Crash log from `xcodebuild … test` to follow.

Comments


Please note: Reports posted here will not necessarily be seen by Apple. All problems should be submitted at bugreport.apple.com before they are posted here. Please only post information for Radars that you have filed yourself, and please do not include Apple confidential information in your posts. Thank you!