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I just “discovered” the #= reader macro from a post on Stackoverflow
and it solves a problem. How likely is this reader macro to become an
official (documented) part of the language? How about deprecated or
changed behavior?
The #= reader macro causes the following s-expression to be evaluated by the Lisp reader (before macro expansion).
It is used by the core language when something is printed with *print-dup* true, so I’d wager that it is going to stay. No idea why it is not documented.