I just modified two lines in Scanner and now you can use left arrow
for assignment.  (Which is not for the first time and has been done by many.)

  In the attached picture, variable "a" gets 10 and the assignment
symbol is U+2190 (taken from a Japanese font).  Variable "b" gets "a *
3" and the assignment is traditional one.

  As for input the character, it doesn't have to be a single
keystroke.  What I suggested here:

http://lists.squeakfoundation.org/pipermail/squeak-dev/2004-December/085348.html

got implemented as announced here:

http://lists.squeakfoundation.org/pipermail/squeak-dev/2007-April/115513.html

-- Yoshiki
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