Work around needless_raw_string_hashes pedantic clippy lint in test

    warning: unnecessary hashes around raw string literal
      --> tests/test_formatdoc.rs:65:29
       |
    65 |       let indoc = formatdoc! {r#"
       |  _____________________________^
    66 | |         {:?}
    67 | |
    68 | |             \\{}
    69 | |         {}"#,
       | |____________^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_raw_string_hashes
       = note: `-W clippy::needless-raw-string-hashes` implied by `-W clippy::pedantic`
       = help: to override `-W clippy::pedantic` add `#[allow(clippy::needless_raw_string_hashes)]`
    help: remove all the hashes around the string literal
       |
    65 ~     let indoc = formatdoc! {r"
    66 |         {:?}
    67 |
    68 |             \\{}
    69 ~         {}",
       |

Author: dtolnay

tests/test_formatdoc.rs

@@ -63,13 +63,13 @@ fn one_line() {
 #[test]
 fn raw_string() {
     let indoc = formatdoc! {r#"
-        {:?}
+        {:?}"
 
             \\{}
         {}"#,
         "a", 'b', 'c'
     };
-    let expected = "\"a\"\n\n    \\\\b\nc";
+    let expected = "\"a\"\"\n\n    \\\\b\nc";
     assert_eq!(indoc, expected);
 }