LL | let _ = Some(format!("{}", a + "bar"));
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`
-error: aborting due to 13 previous errors
+error: useless use of `format!`
+ --> $DIR/format.rs:73:22
+ |
+LL | let _s: String = format!("{}", &*v.join("/n"));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `(&*v.join("/n")).to_string()`
+
+error: aborting due to 14 previous errors