Update the comment on simpler exhaustive matching in derive #2388
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The code in these comments was supported without a feature gate in rustc 1.15.0-nightly at the time that the comments got added in #678, but was later feature gated behind
feature(never_type)by rust-lang/rust#39290, then byfeature(exhaustive_patterns)in rust-lang/rust#47630.Closes #2379.