code: function sc_bindExitLambda(proc) {
      var escape_obj = new sc_BindExitException();
      var escape = function(res) {
  	escape_obj.res = res;
  	throw escape_obj;
      };
      try {
  	return proc(escape);
      } catch(e) {
  	if (e === escape_obj) {
  	    return e.res;
  	}
  	throw e;
      }
  }
docs: * META ((export bind-exit-lambda))