Replace rustc_lexer/unescape with rustc-literal-escaper crate

Author: GuillaumeGomez

Cargo.lock

@@ -3150,6 +3150,12 @@ version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
 
+[[package]]
+name = "rustc-literal-escaper"
+version = "0.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfdd0fcb1409d38cb2d940400497e2384a4a04b8685ee92a0a7a8986ccd72115"
+
 [[package]]
 name = "rustc-main"
 version = "0.0.0"
@@ -3242,10 +3248,10 @@ version = "0.0.0"
 dependencies = [
  "bitflags",
  "memchr",
+ "rustc-literal-escaper",
  "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
- "rustc_lexer",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
@@ -4200,6 +4206,7 @@ name = "rustc_parse"
 version = "0.0.0"
 dependencies = [
  "bitflags",
+ "rustc-literal-escaper",
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_data_structures",
@@ -4222,6 +4229,7 @@ dependencies = [
 name = "rustc_parse_format"
 version = "0.0.0"
 dependencies = [
+ "rustc-literal-escaper",
  "rustc_index",
  "rustc_lexer",
 ]

compiler/rustc_ast/Cargo.toml

@@ -10,7 +10,7 @@ memchr = "2.7.4"
 rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_index = { path = "../rustc_index" }
-rustc_lexer = { path = "../rustc_lexer" }
+rustc-literal-escaper = "0.0.1"
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }

compiler/rustc_ast/src/util/literal.rs

@@ -2,7 +2,7 @@
 
 use std::{ascii, fmt, str};
 
-use rustc_lexer::unescape::{
+use rustc_literal_escaper::{
     MixedUnit, Mode, byte_from_char, unescape_byte, unescape_char, unescape_mixed, unescape_unicode,
 };
 use rustc_span::{Span, Symbol, kw, sym};

compiler/rustc_lexer/src/lib.rs

@@ -26,7 +26,6 @@
 // tidy-alphabetical-end
 
 mod cursor;
-pub mod unescape;
 
 #[cfg(test)]
 mod tests;