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input-format: Delegate exact Unicode version to the standard library #2403

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input-format: Delegate exact Unicode version to the standard library #2403

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4 changes: 2 additions & 2 deletions src/identifiers.md
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Expand Up @@ -85,5 +85,5 @@ It is an error to use the [RESERVED_RAW_IDENTIFIER] token.
[proc-macro]: procedural-macros.md
[reserved]: keywords.md#reserved-keywords
[strict]: keywords.md#strict-keywords
[UAX15]: https://www.unicode.org/reports/tr15/tr15-57.html
[UAX31]: https://www.unicode.org/reports/tr31/tr31-43.html
[UAX15]: https://www.unicode.org/reports/tr15
[UAX31]: https://www.unicode.org/reports/tr31
6 changes: 5 additions & 1 deletion src/input-format.md
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Expand Up @@ -21,11 +21,14 @@ r[input.encoding]
## Source encoding

r[input.encoding.utf8]
Each source file is interpreted as a sequence of Unicode characters encoded in UTF-8.
Each source file is interpreted as a sequence of Unicode characters encoded in UTF-8. Information on this encoding can be found at <https://www.unicode.org/versions/latest/core-spec/chapter-3/#G31703>.

r[input.encoding.invalid]
It is an error if the file is not valid UTF-8.

r[input.encoding.unicode-version]
Unicode is an evolving standard, which Rust tracks. The exact version used by the Rust language is delegated to the standard library, documented at [`char::UNICODE_VERSION`].

r[input.byte-order-mark]
## Byte order mark removal

Expand Down Expand Up @@ -62,3 +65,4 @@ The resulting sequence of characters is then converted into tokens as described
[Crates and source files]: crates-and-source-files.md
[shebang]: shebang.md
[whitespace]: whitespace.md
[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#associatedconstant.UNICODE_VERSION
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