'Golden tests' are tests that deliberately save expected output to a file, to make them easy to examine or regenerate.
https://ro-che.info/articles/2017-12-04-golden-tests
I'm familiar with the concept, but it's nice to see a handy label for it.
miniblog.
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Rust is exploring ideas that allow it to generalise over effects, so you don't need foo and foo_async.
It's an unusual name, and potentially complicates error messages, but it's good problem to examine.