[heycam/webidl] Editorial: Correct assertion (#500)

|F| is not defined until later. Use an equivalent check instead.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/500

-- Commit Summary --

  * Editorial: Correct assertion

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/500.patch
https://github.com/heycam/webidl/pull/500.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/heycam/webidl/pull/500