endsWithEOF parse error handling

[adon-at-work]

Would be great to warn developers if a template is found ending in states that have parse errors

Reference: EOF parse error handling as in https://html.spec.whatwg.org/multipage/syntax.html#tokenization

[neraliu]

should we in general warn the developer if the template does not end with DATA state if it is not a partial template?

[adon-at-work]

that could be a temp fix.
The spec defines that there're no parse errors (warnings) if a file ends in https://html.spec.whatwg.org/multipage/syntax.html#rawtext-state and some others though.