Xcode hangs when converting project to Swift 3

Originator:dloewenherz
Number:rdar://28323599 Date Originated:15-Sep-2016 01:25 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 7
Classification:Serious Bug Reproducible:Always
 
Summary:
Xcode gets stuck when converting a complex project to Swift 3.

Steps to Reproduce:
1. Open a complex project written for Swift 2.2 in Xcode 8.
2. Convert to Swift 3.


Expected Results:
The project converts within a few minutes.

Actual Results:
After an hour, Xcode remains stuck on "Converting X: X | Compiling Swift source files".

Version:
Version 8.0 (8A218a)
macOS 10.11.6 (15G1004)

Notes:


Configuration:
iMac (Retina 5K, 27-inch, Late 2014)
4 GHz Intel Core i7
16 GB 1600 MHz DDR3
AMD Radeon R9 M295X 4096 MB


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