Remove proc-macro-error dependency #1180
Merged
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Closes #1173.
I chose to minimize the diff by introducing a minimal
abort!
macro that early-returns likeanyhow::bail!
or similar macros, which reduces the amount of code that has to change a lot.Further refactorings are possible (in particular, I personally prefer to collect all attribute errors and emitting them individually where possible, instead of short-circuiting on the first error), but I didn't do any of that in this PR for the same reason. Let me know if you're interested in anything like that.