@weekend_editor Interlisp had read macros in the 1970s too.
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@vnikolov The 1974 edition of the Interlisp Reference Manual introduces this notation for circular structures:
http://lispm.de/docs/Publications/Lisp%20Language%20Manuals/1974%20Interlisp%20RefMan.pdf#page=505
@amoroso
Thank you!
I found it in section 21.7.
[Of the Interlisp Reference Manual, 1974.]
The notation there is with asterisks.
Besides "circular", their terminology uses "reentrant", rather than "shared".
I find the speed at which such things historically evolved interesting.
