Update description of Empty Enum for accuracy #78274
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An empty enum is similar to the never type `!`, rather than the unit type `()`.
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This was referenced Oct 23, 2020
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…as-schievink Rollup of 15 pull requests Successful merges: - rust-lang#76649 (Add a spin loop hint for Arc::downgrade) - rust-lang#77392 (add `insert` to `Option`) - rust-lang#77716 (Revert "Allow dynamic linking for iOS/tvOS targets.") - rust-lang#78109 (Check for exhaustion in RangeInclusive::contains and slicing) - rust-lang#78198 (Simplify assert terminator only if condition evaluates to expected value) - rust-lang#78243 (--test-args flag description) - rust-lang#78249 (improve const infer error) - rust-lang#78250 (Document inline-const) - rust-lang#78264 (Add regression test for issue-77475) - rust-lang#78274 (Update description of Empty Enum for accuracy) - rust-lang#78278 (move `visit_predicate` into `TypeVisitor`) - rust-lang#78292 (Loop instead of recursion) - rust-lang#78293 (Always store Rustdoc theme when it's changed) - rust-lang#78300 (Make codegen coverage_context optional, and check) - rust-lang#78307 (Revert "Set .llvmbc and .llvmcmd sections as allocatable") Failed merges: r? `@ghost`
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An empty enum is similar to the never type
!, rather than the unit type().