go to the DATA-LENS․TRANSDUCERS․INTERNALS∶∶REDUCE-GENERIC COMMON-LISP∶∶T COMMON-LISP∶∶SYMBOL COMMON-LISP∶∶T method (The data-lens/beta/transducers Reference Manual)
The node you are looking for is at go to the DATA-LENS․TRANSDUCERS․INTERNALS∶∶REDUCE-GENERIC COMMON-LISP∶∶T COMMON-LISP∶∶SYMBOL COMMON-LISP∶∶T method.