Raw string to avoid escaped backslashes where possible

Author: dtolnay

src/fallback.rs

@@ -1019,9 +1019,9 @@ impl Literal {
                         .starts_with(|next| '0' <= next && next <= '7')
                     {
                         // circumvent clippy::octal_escapes lint
-                        "\\x00"
+                        r"\x00"
                     } else {
-                        "\\0"
+                        r"\0"
                     },
                 );
             } else if ch == '\'' {
@@ -1063,10 +1063,10 @@ impl Literal {
                 b'\n' => repr.push_str(r"\n"),
                 b'\r' => repr.push_str(r"\r"),
                 b'"' => repr.push_str("\\\""),
-                b'\\' => repr.push_str("\\\\"),
+                b'\\' => repr.push_str(r"\\"),
                 b'\x20'..=b'\x7E' => repr.push(b as char),
                 _ => {
-                    let _ = write!(repr, "\\x{:02X}", b);
+                    let _ = write!(repr, r"\x{:02X}", b);
                 }
             }
         }

tests/test.rs

@@ -189,7 +189,7 @@ fn literal_c_string() {
 #[test]
 fn literal_character() {
     assert_eq!(Literal::character('x').to_string(), "'x'");
-    assert_eq!(Literal::character('\'').to_string(), "'\\''");
+    assert_eq!(Literal::character('\'').to_string(), r"'\''");
     assert_eq!(Literal::character('"').to_string(), "'\"'");
 }
 
@@ -378,7 +378,7 @@ fn roundtrip() {
     roundtrip("'a");
     roundtrip("'_");
     roundtrip("'static");
-    roundtrip("'\\u{10__FFFF}'");
+    roundtrip(r"'\u{10__FFFF}'");
     roundtrip("\"\\u{10_F0FF__}foo\\u{1_0_0_0__}\"");
 }