Swift compiler crashes on block type from un-imported module

Originator:adam
Number:rdar://23021616 Date Originated:08/10/15
Status:Closed Resolved:Yes
Product:Developer Tools Product Version:Xcode 7.0 (7A220), 7.0.1 (7A1001). OS X 10.10.5 (14F27), 10.11 (15A282b).
Classification:Crash/Hang/Data Loss Reproducible:Always
 
Summary:
The following code causes swift to segfault:

thing.kaboom { (result: Thing!) -> Void in
	dispatch_async(dispatch_get_main_queue(), { () -> Void in
		// crash!
	})
}

The block on kaboom is of type TestBlock, and the module containing the typedef is not imported into the file in question.

Steps to Reproduce:
Open and build the attached Xcode project.

Expected Results:
Error that the class in the argument (Thing) is not defined.

Actual Results:
Swift segfaults.

Regression:
Can reproduce this on multiple machines: iMac (2013), MacBook Air (2013).

Comments


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