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I believe that withoutboats has deprecated that, and now recommends anyhow (for applications) or thiserror (for libraries).

I’ve tried them, and they really do take most of the toil out of defining errors.

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Pretty sure you're talking about Failure, not Fehler. Failure is (like Anyhow and Thiserror) for defining error types, Fehler is an alternate syntax for the functions that return those errors.

fehler isn't deprecated, but _I_ did deprecate the similarly named https://github.com/rust-lang-nursery/failure/ with withoutboat's blessing.

failure proceeded fehler by several years.

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