&optional
non-terminating-p readtable → tmake-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.
None.
None.
None.
\issue{ARGUMENTS-UNDERSPECIFIED:SPECIFY}