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Rollup merge of #124051 - dtolnay:emptyset, r=compiler-errors

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Fix empty-set symbol in comments

The symbol in the original code is U+00D8 "LATIN CAPITAL LETTER O WITH STROKE" (https://en.wikipedia.org/wiki/%C3%98) which is an uppercase letter in Danish, Norwegian, Faroese, and Southern Sámi alphabets.

The symbol that was intended is U+2205 "EMPTY SET" (https://en.wikipedia.org/wiki/Empty_set#Notation).

| Before | After |
|---|---|
| ![Screenshot from 2024-04-16 18-25-01](9b8b0624-cfa5-4b89-84e5-4c2b39c2cb8f) | ![Screenshot from 2024-04-16 18-25-05](6f6b34c3-0e47-4ba0-856d-be1dc164c94c) |
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Matthias Krüger 2024-04-17 05:44:54 +02:00 • committed by GitHub
commit d783ea0c0e
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library/proc_macro/src/lib.rs
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@ -811,7 +811,7 @@ pub enum Delimiter {
/// `[ ... ]`
#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
Bracket,
/// `Ø ... Ø`
/// `∅ ... ∅`
/// An invisible delimiter, that may, for example, appear around tokens coming from a
/// "macro variable" `$var`. It is important to preserve operator priorities in cases like
/// `$var * 3` where `$var` is `1 + 2`.