X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Fdoc%2Fgrammar.md;h=4017c84c9b4b8a2cc2d86efdab145bac630d7954;hb=ce0b7cc529b2bba4207bcc2d93af4c7bb3640e64;hp=78432b6a9659370cac1ae373770e795f0b8469b7;hpb=f0fdaba04ea7474cd1f66264ef4edb3485a95864;p=rust.git diff --git a/src/doc/grammar.md b/src/doc/grammar.md index 78432b6a965..4017c84c9b4 100644 --- a/src/doc/grammar.md +++ b/src/doc/grammar.md @@ -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