"Hal Abelson contributed by holding this report hostage to the appendix on macros." http://t.co/meOY4Gl9ka
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Chekhov's repro: If a line of code is included in a bug report, it should contribute to the debugging somewhere.
I'm working on arity errors in Garden, my toy programming language.
Rather than just saying "expected 3, got 4 arguments", I'm trying to report where the extra argument is, or what extra argument was expected.