ARC converter never shows diff preview

Number:rdar://9996024 Date Originated:Mon, 22 Aug 2011 14:50:07 GMT
Status:Open Resolved:
Product:Developer Tools Product Version:4.2 (4D5163b)
Classification:Serious Bug Reproducible:Sometimes
Summary: Using the ARC converter nerves shows diff preview for me, even using empty projects created in Xcode 4.1.

Steps to Reproduce:  

- Create a new project in Xcode 4.1 
- Make *no* modification to the project
- Open that project in Xcode 4.2
- Convert the project to ARC

Expected Results: The preview of changes shows up.

Actual Results: The preview of changes is empty.


Notes: Creating a new project in Xcode 4.2 without using ARC will show diff preview, but that's the only I saw the diff preview.

Attached a screenshot of the result with a 4.1-created project.

Attached a standard project template provided by Xcode 4.1 that fail to show diff in the ARC conversion.


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