When rewriting blocks, models or helpers make sure that the path is pointing to existing block and there is no misspell in the path.
For example, I just spent a lot time figuring out why the following rewrite didn't work:
Path_to_My_class
As you can see it i have 'views' where it needs to be 'view'. Thus, there does not exist the block i am trying to rewrite resulting no errors and no rewrites as well.
Alan, I would like to write the case myself once i will get the Configlint work. I am having issue installing it. The issue I have posted at the 'gitHub'. I want to do myself because i want to be involved in this project
thanks,
Margots