code: private RValue[] packReturns(CallStack frame, Decl.Callable decl) {
  		if (decl instanceof Decl.Property) {
  			return new RValue[] { RValue.True };
  		} else {
  			Tuple<Decl.Variable> returns = decl.getReturns();
  			RValue[] values = new RValue[returns.size()];
  			for (int i = 0; i != values.length; ++i) {
  				values[i] = frame.getLocal(returns.get(i).getName());
  			}
  			return values;
  		}
  	}
docs: Given an execution frame, extract the return values from a given function
  or method. The parameters of the function or method are located first in
  the frame, followed by the return values.
  
  @param frame
  @param type
  @return