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Since [1], the fragment specifier is unconditionally required in all
editions. This means `NonTerminalKind` no longer needs to be optional,
as we can reject this code during the expansion of `macro_rules!` rather
than handling it throughout the code. Do this cleanup here.
[1]: https://github.com/rust-lang/rust/pull/128425
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This was attempted in [1] then reverted in [2] because of fallout.
Recently, this was made an edition-dependent error in [3].
Make missing fragment specifiers an unconditional error again.
[1]: https://github.com/rust-lang/rust/pull/75516
[2]: https://github.com/rust-lang/rust/pull/80210
[3]: https://github.com/rust-lang/rust/pull/128006
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`missing_fragment_specifier` has been a future compatibility warning
since 2017. Uplifting it to an unconditional hard error was attempted in
2020, but eventually reverted due to fallout.
Make it an error only in edition >= 2024, leaving the lint for older
editions. This change will make it easier to support more macro syntax
that relies on usage of `$`.
Fixes <https://github.com/rust-lang/rust/issues/40107>
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