Known Isuses Blocked on Externally

[mitsuhiko]

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This is a meta issue about problems insta is running into, that insta cannot resolve itself without external help:

• Cannot discover test name reliably: rust-lang/rust#70492: Currently we try to use the thread name to get the test name, but this will not work in all cases. There is a workaround where we try to parse the back trace but that also only works if debug information is available and it's very brittle
• We don't have a reliable way to get the cargo workspace root without shelling out to cargo: rust-lang/cargo#3946

[max-sixty]

On the second, I had a branch at one point that added cargo as an optional dependency to avoid shelling out. But it caused massive bloat, so I abandoned it pretty quickly.