Make printer print shared pairs and cyclic data as labels

masak / bel

An interpreter for Bel, Paul Graham's Lisp language

GNU General Public License v3.0

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Closed masak closed 3 years ago

masak commented 3 years ago

Closes #225.

Required to take this PR out of draft:

[x] Thorough tests
[x] An implementation where the duplicate lookup is hash-based, not a linear lookup
[x] A non-recursive implementation (the printer itself is still recursive, but no need to make it worse)