On Sun, Jun 7, 2015 at 2:02 PM, Glenn Morris <rgm@gnu.org> wrote:
Unlike other file local variables, this must be set in the first line of
  a file.

Then please disregard this bug! My mistake, I think I might have skimmed over that part.

(I'm still kind of wondering why lexical-binding is an oddball like this, but anyway...)

Thank you.