Remove 'failure' dep in favor of 'thiserror' #15
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This also adds a concrete Error enum type in favor of strings in a generic error type.
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The
failurecrate has been deprecated for some time, with a recommendation to usethiserrorinstead. In addition, a critical memory safety issue (rust-lang-deprecated/failure#336) has been found infailurethat is unlikely to be fixed.rustc-cfgis not vulnerable to the issue, but IMO it's better to just avoid havingfailurein our dependency trees at all.