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Rollup merge of #34370 - steveklabnik:keyword-ref-mention, r=Manishearth

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A disclaimer about keywords.

Some people cite this list as "zomg Rust has so many keywords," so make
it clear that these aren't all used by the language today.
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Jonathan Turner 2016-08-17 06:25:22 -07:00 committed by GitHub
commit e83bff90ff
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src/doc/grammar.md
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@ -172,6 +172,11 @@ token : simple_token | ident | literal | symbol | whitespace token ;
Each of these keywords has special meaning in its grammar, and all of them are
excluded from the `ident` rule.
Not all of these keywords are used by the language. Some of them were used
before Rust 1.0, and were left reserved once their implementations were
removed. Some of them were reserved before 1.0 to make space for possible
future features.
### Literals
```antlr