lispdoc - results for shiftf

(shiftf &whole form &rest args &environment env)
Function: One or more SETF-style place expressions, followed by a single value expression. Evaluates all of the expressions in turn, then assigns the value of each expression to the place on its left, returning the value of the leftmost.
 Mentioned in:
CLtL2 - 7.2. Generalized Variables
HyperSpec - Macro SHIFTF
PCL - other ways to modify places