Allow --edition 2021 to be passed to rustfmt
#4847
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This was added to Configurations.md in #4618, but the option wasn't actually made available. This should let people who are using Rust 2021 on nightly rustc run `cargo fmt` again.
calebcartwright
approved these changes
Jun 9, 2021
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Support for Rust 2021 was added in #4618, but it wasn't actually made available through
rustfmt's command line. This should let people who are testing Rust 2021 on nightly rustc runcargo fmtagain. Please let me know if I should add a test for this or if this should be gated somehow!