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Document: don't allow characters with unicode property Bidi_Class in source files #10197

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Nov 4, 2022
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Document: don't allow characters with unicode property Bidi_Class in source files #10197

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5 changes: 5 additions & 0 deletions spec/01-lexical-syntax.md
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Expand Up @@ -8,6 +8,11 @@ chapter: 1

Scala source code consists of Unicode text.

The nine [Bidirectional explicit formatting](https://www.unicode.org/reports/tr9/#Bidirectional_Character_Types)
characters `\u202a - \u202e` and `\u2066 - \u2069` (inclusive) are forbidden
from appearing in source files. Note that they can be represented using
unicode escapes in string and character literals.

The program text is tokenized as described in this chapter.
See the last section for special support for XML literals,
which are parsed in _XML mode_.
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5 changes: 5 additions & 0 deletions spec/13-syntax-summary.md
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Expand Up @@ -8,6 +8,11 @@ chapter: 13

The following descriptions of Scala tokens uses literal characters `‘c’` when referring to the ASCII fragment `\u0000` – `\u007F`.

The nine [Bidirectional explicit formatting](https://www.unicode.org/reports/tr9/#Bidirectional_Character_Types)
characters `\u202a - \u202e` and `\u2066 - \u2069` (inclusive) are forbidden
from appearing in source files. Note that they can be represented using
unicode escapes in string and character literals.

## Lexical Syntax

The lexical syntax of Scala is given by the following grammar in EBNF form:
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