# Notation

## Unicode productions

A few productions in Rust's grammar permit Unicode code points outside the
ASCII range. We define these productions in terms of character properties
specified in the Unicode standard, rather than in terms of ASCII-range code
points. The grammar has a [Special Unicode Productions] section that lists these
productions.

## String table productions

Some rules in the grammar — notably [unary operators], [binary operators],
and [keywords] — are given in a simplified form: as a listing of a table
of unquoted, printable whitespace-separated strings. These cases form a subset
of the rules regarding the [token][tokens] rule, and are assumed to be the
result of a lexical-analysis phase feeding the parser, driven by a
DFA, operating over the
disjunction of all such string table entries.

When such a string enclosed in double-quotes (`"`) occurs inside the grammar,
it is an implicit reference to a single member of such a string table
production. See [tokens] for more information.

[Special Unicode Productions]: ../grammar.html#special-unicode-productions
[binary operators]: expressions/operator-expr.html#arithmetic-and-logical-binary-operators
[keywords]: keywords.html
[tokens]: tokens.html
[unary operators]: expressions/operator-expr.html#borrow-operators
