Task fails when renaming file to same name

[mollsju]

Repro:
Add task to build and set new file name to the name it already has.

Expected behaviour:
Task completes without errors.

We're trying to use this genericaly with our web.config for different environments and it works flawlessy when renaming web.dev,config -> web.config, but fails when trying to rename web.config -> web.config.
The task looks like it completes but (probably) as the file isnt actually renamed it returns an error.