Whitespace
Lexer
WHITESPACE →
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
TAB → U+0009 // Horizontal tab, '\t'
LF → U+000A // Line feed, '\n'
CR → U+000D // Carriage return, '\r'
Whitespace is any non-empty string containing only characters that have the
Pattern_White_Space Unicode property.
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.
A Rust program has identical meaning if each whitespace element is replaced with any other legal whitespace element, such as a single space character.