John Mastro writes:
> This isn't a very deep question, but I wonder every time I come across
> it: to what does "-dup" in `print-dup` and `*print-dup*` refer?
I don’t have any special knowledge in this regard, but I’ve always
thought of it as “duplicate,” which makes some sense when you think of
how it’s used. AFAIK, `print-dup` exists to provide objects which
doen’t normally print to `read`able form an alternative form which is
`read`able. The compiler can then use the `print-dup` form to embed
instance objects in code, by generating code which produces duplicates
via round-tripping through the reader.
user> (print-method (fn []) *out*)
#
nil
user> (print-dup (fn []) *out*)
#=(user$eval1332$fn__1333. )
nil
-Marshall
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