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Fix grammar documentation wrt Unicode identifiers #50790

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May 18, 2018
Merged

Fix grammar documentation wrt Unicode identifiers #50790

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17 changes: 6 additions & 11 deletions src/doc/grammar.md
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Expand Up @@ -101,20 +101,15 @@ properties: `ident`, `non_null`, `non_eol`, `non_single_quote` and

### Identifiers

The `ident` production is any nonempty Unicode[^non_ascii_idents] string of
The `ident` production is any nonempty Unicode string of
the following form:

[^non_ascii_idents]: Non-ASCII characters in identifiers are currently feature
gated. This is expected to improve soon.
- The first character is in one of the following ranges `U+0041` to `U+005A`
("A" to "Z"), `U+0061` to `U+007A` ("a" to "z"), or `U+005F` ("\_").
- The remaining characters are in the range `U+0030` to `U+0039` ("0" to "9"),
or any of the prior valid initial characters.

- The first character has property `XID_start`
- The remaining characters have property `XID_continue`

that does _not_ occur in the set of [keywords](#keywords).

> **Note**: `XID_start` and `XID_continue` as character properties cover the
> character ranges used to form the more familiar C and Java language-family
> identifiers.
as long as the identifier does _not_ occur in the set of [keywords](#keywords).

### Delimiter-restricted productions

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