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Auto merge of #9184 - ehuss:fix-next-edition, r=alexcrichton
Updates to edition handling. This introduces some updates for edition handling (split into commits for review). In short: * `cargo-features = ["edition2021"]` can be used to opt-in to 2021 support without needing to pass around `-Z unstable-options`. I tried to emphasize in the docs that this is only for testing and experimentation. * Make `"2"` the default resolver for 2021 edition. * Make `cargo fix --edition` mean the "next" edition from the present one, and support 2021. Also, if already at the latest edition, generate a warning instead an error. * I decided to allow `cargo fix --edition` from 2018 to 2021 on the nightly channel without an explicit opt-in. It's tricky to implement with an opt-in (see comment in diff). Partial for #9048. Fixes #9047.
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