writeup: update for raw lifetimes/labels and reserved lifetime/label prefixes

This corresponds to the changes made in
rust-lang/rust#126452

Author: mattheww

writeup/fine_grained_tokens.md

@@ -15,6 +15,7 @@ Each fine-grained token has a <dfn>kind</dfn>, and possibly also some attributes
 | `Identifier`           | <var>represented identifier</var>                     |
 | `RawIdentifier`        | <var>represented identifier</var>                     |
 | `LifetimeOrLabel`      | <var>name</var>                                       |
+| `RawLifetimeOrLabel`   | <var>name</var>                                       |
 | `CharacterLiteral`     | <var>represented character</var>, <var>suffix</var>   |
 | `ByteLiteral`          | <var>represented byte</var>, <var>suffix</var>        |
 | `StringLiteral`        | <var>represented string</var>, <var>suffix</var>      |

writeup/pretokens.md

@@ -14,6 +14,7 @@ Each pretoken has a *kind*, and possibly also some attributes, as described in t
 | `Identifier`                | <var>identifier</var>                                                               |
 | `RawIdentifier`             | <var>identifier</var>                                                               |
 | `LifetimeOrLabel`           | <var>name</var>                                                                     |
+| `RawLifetimeOrLabel`        | <var>name</var>                                                                     |
 | `SingleQuoteLiteral`        | <var>prefix</var>, <var>literal content</var>, <var>suffix</var>                    |
 | `DoubleQuoteLiteral`        | <var>prefix</var>, <var>literal content</var>, <var>suffix</var>                    |
 | `RawDoubleQuoteLiteral`     | <var>prefix</var>, <var>literal content</var>, <var>suffix</var>                    |

writeup/reprocessing_cases.md

@@ -8,6 +8,7 @@
 [`Identifier`](#identifier)\
 [`RawIdentifier`](#rawidentifier)\
 [`LifetimeOrLabel`](#lifetimeorlabel)\
+[`RawLifetimeOrLabel`](#rawlifetimeorlabel)\
 [`SingleQuoteLiteral`](#singlequoteliteral)\
 [`DoubleQuoteLiteral`](#doublequoteliteral)\
 [`RawDoubleQuoteLiteral`](#rawdoublequoteliteral)\
@@ -163,6 +164,20 @@ A `LifetimeOrLabel` pretoken is always accepted.
 > See [NFC normalisation for lifetime/label].
 
 
+#### `RawLifetimeOrLabel` { .rcase }
+
+Fine-grained token kind produced:
+`RawLifetimeOrLabel`
+
+A `RawLifetimeOrLabel` pretoken is always accepted.
+
+##### Attributes
+<var>name</var>: copied
+
+> Note that the name is not NFC-normalised.
+> See [NFC normalisation for lifetime/label].
+
+
 #### `SingleQuoteLiteral` { .rcase }
 
 The pretokeniser guarantees the pretoken's <var>prefix</var> attribute is one of the following:

writeup/rules.md

@@ -6,6 +6,8 @@
 [Unterminated block comment](#unterminated-block-comment)\
 [Punctuation](#punctuation)\
 [Single-quoted literal](#single-quoted-literal)\
+[Raw lifetime or label (Rust 2021)](#raw-lifetime-or-label-rust-2021)\
+[Reserved lifetime or label prefix (Rust 2021)](#reserved-lifetime-or-label-prefix-rust-2021)\
 [Lifetime or label](#lifetime-or-label)\
 [Double-quoted non-raw literal (Rust 2015 and 2018)](#double-quoted-non-raw-literal-rust-2015-and-2018)\
 [Double-quoted non-raw literal (Rust 2021)](#double-quoted-non-raw-literal-rust-2021)\
@@ -190,6 +192,43 @@ when `character_sequence` represents an iterator over the sequence of characters
 | <var>suffix</var>          | captured characters |
 
 
+#### Raw lifetime or label (Rust 2021) { .rule }
+
+##### Pattern
+```
+' r \#
+(?<name>
+  [ \p{XID_Start} _ ]
+  \p{XID_Continue} *
+)
+```
+
+##### Pretoken kind
+`RawLifetimeOrLabel`
+
+##### Attributes
+|                 |                     |
+|:----------------|:--------------------|
+| <var>name</var> | captured characters |
+
+
+#### Reserved lifetime or label prefix (Rust 2021) { .rule }
+
+##### Pattern
+```
+'
+[ \p{XID_Start} _ ]
+\p{XID_Continue} *
+\#
+```
+
+##### Pretoken kind
+`Reserved`
+
+##### Attributes
+(none)
+
+
 #### Lifetime or label { .rule }
 
 ##### Pattern

writeup/rustc_oddities.md

@@ -11,7 +11,7 @@ But this doesn't happen for lifetimes or labels, so `'Kelvin` and `'Kelvin` ar
 For example, [this][playground-lifetime] compiles without warning in Rust 1.80, while [this][playground-ident] doesn't.
 
 In this writeup, the <var>represented identifier</var> attribute of `Identifier` and `RawIdentifier` fine-grained tokens is in NFC,
-and the <var>name</var> attribute of `LifetimeOrLabel` tokens isn't.
+and the <var>name</var> attribute of `LifetimeOrLabel` and `RawLifetimeOrLabel` tokens isn't.
 
 I think this behaviour is a promising candidate for provoking the
 "Wait...that's what we currently do? We should fix that."