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Rather than having separate traits implementing as_display method, replace DisplayAsDisplay and PathAsDisplay traits with a AsDisplay trait. The difference between those two traits is in the result returned by the as_display method. With AsDisplay trait this is captured by an associated type. The main motivation for the change is making it simpler to support no_std builds in the future. Previously, PathAsDisplay would have to be handled specially in such builds on the side of macro expansion. Now, thiserror-impl doesn’t need to be aware of any complications around AsDisplay since they are all contained in thiserror crate. |
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