lispdoc - results for set-syntax-from-char

(set-syntax-from-char to-char from-char &optional (to-readtable *readtable*)
 (from-readtable nil))
Function: Causes the syntax of TO-CHAR to be the same as FROM-CHAR in the optional readtable (defaults to the current readtable). The FROM-TABLE defaults to the standard Lisp readtable when NIL.
 Mentioned in:
CLtL2 - 22.1.1. What the Read Function Accepts
CLtL2 - 22.1.5. The Readtable
HyperSpec - Function SET-SYNTAX-FROM-CHAR