I started with this expression:

println("update: {c.x},{c.y} {c.state => {c.nextState}");

Note that the way I typed it in, I hadn't yet typed the closing brace on '{c.state'.  When I position the cursor to type
the closing brace and type it, it is ignored and the cursor moved one space to the right.  I think this is something
about the => being thought to be inside the braces, and therefor ignored.  To get it in, I had to cut and paste a
closing brace.