update to literal-escaper 0.0.4 for better API without unreachable and faster string parsing

src/tools/clippy/clippy_dev/src/update_lints.rs

@@ -2,6 +2,7 @@ use crate::utils::{
     ErrAction, File, FileUpdater, RustSearcher, Token, UpdateMode, UpdateStatus, expect_action, update_text_region_fn,
 };
 use itertools::Itertools;
+use rustc_lexer::{LiteralKind, TokenKind, tokenize};
 use std::collections::HashSet;
 use std::fmt::Write;
 use std::ops::Range;
@@ -342,7 +343,7 @@ fn parse_str_lit(s: &str) -> String {
         .and_then(|s| s.strip_suffix('"'))
         .unwrap_or_else(|| panic!("expected quoted string, found `{s}`"));
     let mut res = String::with_capacity(s.len());
-    rustc_literal_escaper::unescape_unicode(s, mode, &mut |_, ch| {
+    rustc_literal_escaper::unescape_str(s, |range, ch| {
         if let Ok(ch) = ch {
             res.push(ch);
         }

src/tools/lint-docs/Cargo.toml

@@ -7,7 +7,7 @@ description = "A script to extract the lint documentation for the rustc book."
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rustc-literal-escaper = "0.0.2"
+rustc-literal-escaper = "0.0.4"
 serde_json = "1.0.57"
 tempfile = "3.1.0"
 walkdir = "2.3.1"

src/tools/lint-docs/src/lib.rs

@@ -4,7 +4,7 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
-use rustc_literal_escaper::{Mode, unescape_unicode};
+use rustc_literal_escaper::unescape_str;
 use walkdir::WalkDir;
 
 mod groups;
@@ -218,7 +218,7 @@ impl<'a> LintExtractor<'a> {
                         } else if let Some(text) = line.strip_prefix("#[doc = \"") {
                             let escaped = text.strip_suffix("\"]").unwrap();
                             let mut buf = String::new();
-                            unescape_unicode(escaped, Mode::Str, &mut |_, c| match c {
+                            unescape_str(escaped, |_, res| match res {
                                 Ok(c) => buf.push(c),
                                 Err(err) => {
                                     assert!(!err.is_fatal(), "failed to unescape string literal")