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make-dispatch-macro-character  char &optional non-terminating-p readtable ⇒  t
char—a character.
non-terminating-p—a generalized boolean. The default is false.
readtable—a readtable. The default is the current readtable.
make-dispatch-macro-character makes char be a dispatching macro character in readtable.
Initially, every character in the dispatch table associated with the char has an associated function that signals an error of type reader-error.
If non-terminating-p is true, the dispatching macro character is made a non-terminating macro character; if non-terminating-p is false, the dispatching macro character is made a terminating macro character.
 (get-macro-character #\{) ⇒  NIL, false
 (make-dispatch-macro-character #\{) ⇒  T
 (not (get-macro-character #\{)) ⇒  false
The readtable is altered.