[sc-dev] tail call optimization bug.

[James McCartney <asynth@xxxxxx>]

As a result of the block thread, I've discovered a bug in the tail call 
optimization that I don't know how to solve right now, so I am going to 
turn that off.

	tail call optimize has a bug which happens when a non local return 
occurs from a method inside of a tail call optimized return.
	here's a simple example but there are more subtle variations:
	mymethod {
		^{ ^'ouch' }.value
	}
	the method gets returned from and then the .value method is called, 
but that then also wants to return and it doesn't realize that
	the caller has been blown away already, so it tries to return to an 
even higher place on the stack.