Better error message when module imports itself

[ScallyGames]

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[ ] bug report => search github for a similar issue or PR before submitting
[x] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

When a module imports itself a generic
Uncaught RangeError: Maximum call stack size exceeded
is thrown which could have a whole bunch of reasons.

Expected behavior

It would be really nice if Angular could detect self-imports (maybe even circular imports if that's a thing) and show a more helpful error message to spare developers the time of debugging.

Minimal reproduction of the problem with instructions

http://plnkr.co/edit/hD9KHmgNKgiNYwXCUYp4

Run and check the console.
Removing AppModule from AppModule's imports resolves the problem.

What is the motivation / use case for changing the behavior?

Cause could be a developers mistake, wrong entry of autocomplete (many IDEs offer it as an option since the class is in scope) or even refactoring gone wrong (which would possibly cause hours of debugging, searching for self-generated loops in functions etc.), ...

Best clue when searching on the internet is this content, which is not even really related to the issue topic
#7930 (comment)

• Angular version: 2.4.8

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