[whatwg] Parse error for "--" in comment end state?

[Simon Pieters]

Hi,

Shouldn't the Anything else entry in Comment end state[1] be a parse error? 
As written, the following is allowed:

   <!-- -- -->

I thought it shouldn't for compability with the "SGML comments" 
implementations.

[1] http://whatwg.org/specs/web-apps/current-work/#comment1

Regards,
Simon Pieters