chumsky
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Use diagnostic namespace on stable
#[diagnostic::on_unimplemented] was stabilized in Rust 1.78.0 :)
(Should the MSRV be increased?)
Interesting question. Given that 1.0 is pre-release, I'd be inclined to say 'yes'. Obviously, when 1.0 releases, it'll be a good idea to pin it down a lot more.