[plt-scheme] world.ss ke=?

Dear All,

In the world.ss documentation I see:

(ke=? x y) → boolean?

  x : key-event?

  y : key-event?

compares two KeyEvent for equality


DrScheme, however, complains about referencing an identifier before
its definition:

> ke=?
reference to an identifier before its definition: ke=?

The world.ss teachpack has been added. Has ke=? been renamed? If so,
what is it called now? If not, a combination of char?, char=?,
symbol?, and symbol=? works, but is much more cumbersome. Any pointers
will be appreciated.

-- 

Cheers,

Marco