From the signatures of these functions, the obvious difference is that set-macro-character allows you to set reader macro function for a single character, and set-dispatch-macro-character allows you to set it for any combination of two characters. Is this the only difference? When do I need to use one instead of another?
set-macro-character governs
reading objects marked with a single special character, e.g.,
set-dispatch-macro-character
governs reading objects marked with two (or more) characters, e.g.,
#(...)#A(...)#S(...)See