Well, the code isn't actually ambiguous (since the spec states well defined behaviour), just very easy to misinterpret.

Ambiguous to a human, vs. a compiler.

Ambiguous to a human who doesn't understand the rules of automatic semicolon insertion. Maybe such a human shouldn't be using javascript in the first place, instead of working in fear.

Human doesn't understand complex rule with counterintuitive corner case. Film at 11.