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A disclaimer about keywords. #34370

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Aug 17, 2016
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A disclaimer about keywords. #34370

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5 changes: 5 additions & 0 deletions src/doc/grammar.md
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Expand Up @@ -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
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