| r[lex.whitespace] |
| # Whitespace |
| |
| r[lex.whitespace.intro] |
| Whitespace is any non-empty string containing only characters that have the |
| [`Pattern_White_Space`] Unicode property, namely: |
| |
| - `U+0009` (horizontal tab, `'\t'`) |
| - `U+000A` (line feed, `'\n'`) |
| - `U+000B` (vertical tab) |
| - `U+000C` (form feed) |
| - `U+000D` (carriage return, `'\r'`) |
| - `U+0020` (space, `' '`) |
| - `U+0085` (next line) |
| - `U+200E` (left-to-right mark) |
| - `U+200F` (right-to-left mark) |
| - `U+2028` (line separator) |
| - `U+2029` (paragraph separator) |
| |
| r[lex.whitespace.token-sep] |
| Rust is a "free-form" language, meaning that all forms of whitespace serve only |
| to separate _tokens_ in the grammar, and have no semantic significance. |
| |
| r[lex.whitespace.replacement] |
| A Rust program has identical meaning if each whitespace element is replaced |
| with any other legal whitespace element, such as a single space character. |
| |
| [`Pattern_White_Space`]: https://www.unicode.org/reports/tr31/ |
