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Steps to reproduce and a minimal demo of the problem

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Plunker

What steps should we try in your demo to see the problem?

Current behavior
Angular doesn't complain and it's working fine

Expected/desired behavior
#5591
#5563
#2133

I haven't found any issues where self-closing tags were reintroduced.

Other information

See also http://stackoverflow.com/questions/36492169/i-have-an-error-in-angular-2-when-im-trying-to-use-nested-components/36492238#36492238