Remove thiserror (extracted from #64) #70
Merged
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What
Remove the thiserror crate and replace with the same code that would be generated.
Why
As @overcat pointed out in #64 (comment), the thiserror crate does very little, and crates a dependence on std that we plan to remove in #64.
This change was authored by @overcat in #64, and has been extracted to commit separately to reduce the dep graph created by this crate.
Known limitations
[TODO or N/A]