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Rollup merge of #50791 - bstrie:null, r=QuietMisdreavus

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Fix null exclusions in grammar docs

The grammar documentation incorrectly says that comments, character literals,
and string literals may not include null.
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Mark Simulacrum 2018-05-17 13:51:25 -06:00 committed by GitHub
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src/doc/grammar.md
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@ -116,9 +116,9 @@ as long as the identifier does _not_ occur in the set of [keywords](#keywords).
Some productions are defined by exclusion of particular Unicode characters:
- `non_null` is any single Unicode character aside from `U+0000` (null)
- `non_eol` is `non_null` restricted to exclude `U+000A` (`'\n'`)
- `non_single_quote` is `non_null` restricted to exclude `U+0027` (`'`)
- `non_double_quote` is `non_null` restricted to exclude `U+0022` (`"`)
- `non_eol` is any single Unicode character aside from `U+000A` (`'\n'`)
- `non_single_quote` is any single Unicode character aside from `U+0027` (`'`)
- `non_double_quote` is any single Unicode character aside from `U+0022` (`"`)
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