Trying to use eww-open-file to visit the attached HTML file aborts Emacs
with the following printed to stderr:

    character.h:380: Emacs fatal error: assertion failed: 0xC0 <= c

To reproduce,

    1. Save the attached "buggy_html.html" file somewhere
    2. emacs -Q
    3. M-x eww-open-file RET /wherever/buggy_html.html RET
    4. Wait for Emacs to abort

Visiting the file with find-file doesn't abort.  Neither does using
shr-render-buffer to render the buffer:

    (with-temp-buffer
      (insert-file-contents "buggy_html.html")
      (shr-render-buffer (current-buffer)))
    
I am also attaching the backtrace in the file "eww-backtrace."