Merge #7853

7853: Update lexer r=kjeremy a=kjeremy



Co-authored-by: kjeremy <kjeremy@gmail.com>

Author: bors[bot]

Cargo.lock

@@ -13,7 +13,7 @@ doctest = false
 [dependencies]
 itertools = "0.10.0"
 rowan = "0.12.2"
-rustc_lexer = { version = "708.0.0", package = "rustc-ap-rustc_lexer" }
+rustc_lexer = { version = "709.0.0", package = "rustc-ap-rustc_lexer" }
 rustc-hash = "1.1.0"
 arrayvec = "0.5.1"
 once_cell = "1.3.1"