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Document the <=0x7F restriction on \x escapes. #270

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Mar 22, 2018
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Document the <=0x7F restriction on \x escapes. #270

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8 changes: 5 additions & 3 deletions src/tokens.md
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Expand Up @@ -143,8 +143,10 @@ literals. An escape starts with a `U+005C` (`\`) and continues with one of the
following forms:

* An _8-bit code point escape_ starts with `U+0078` (`x`) and is
followed by exactly two _hex digits_. It denotes the Unicode code point
equal to the provided hex value.
followed by exactly two _hex digits_ with value up to `0x7F`. It denotes the
ASCII character with value equal to the provided hex value. Higher values are
not permitted because it is ambiguous whether they mean Unicode code points or
byte values.
* A _24-bit code point escape_ starts with `U+0075` (`u`) and is followed
by up to six _hex digits_ surrounded by braces `U+007B` (`{`) and `U+007D`
(`}`). It denotes the Unicode code point equal to the provided hex value.
Expand All @@ -154,7 +156,7 @@ following forms:
* The _null escape_ is the character `U+0030` (`0`) and denotes the Unicode
value `U+0000` (NUL).
* The _backslash escape_ is the character `U+005C` (`\`) which must be
escaped in order to denote *itself*.
escaped in order to denote itself.

#### Raw string literals

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