Mark format! with must_use hint

Author: lukas

tests/ui/or_fun_call.fixed

@@ -98,7 +98,7 @@ fn or_fun_call() {
 
     let opt = Some(1);
     let hello = "Hello";
-    let _ = opt.ok_or(format!("{} world.", hello));
+    let _ = opt.ok_or_else(|| format!("{} world.", hello));
 
     // index
     let map = HashMap::<u64, u64>::new();

tests/ui/or_fun_call.stderr

@@ -100,6 +100,12 @@ error: use of `unwrap_or` to construct default value
 LL |     let _ = stringy.unwrap_or(String::new());
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `unwrap_or_default()`
 
+error: use of `ok_or` followed by a function call
+  --> tests/ui/or_fun_call.rs:101:17
+   |
+LL |     let _ = opt.ok_or(format!("{} world.", hello));
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ok_or_else(|| format!("{} world.", hello))`
+
 error: use of `unwrap_or` followed by a function call
   --> tests/ui/or_fun_call.rs:105:21
    |
@@ -190,5 +196,5 @@ error: use of `unwrap_or_else` to construct default value
 LL |         let _ = stringy.unwrap_or_else(String::new);
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `unwrap_or_default()`
 
-error: aborting due to 31 previous errors
+error: aborting due to 32 previous errors