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mbe: Clean up code with non-optional `NonterminalKind` Since [rust-lang/rust#128425], 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. [rust-lang/rust#128425]: https://github.com/rust-lang/rust/pull/128425