warning: denote infinite loops with `loop { ... }`
  --> $DIR/unicode_3.rs:12:45
   |
12 |     let s = "ZͨA͑ͦ͒͋ͤ͑̚L̄͑͋Ĝͨͥ̿͒̽̈́Oͥ͛ͭ!̏"; while true { break; }
   |                       ----------^^^^^^^^^^^
   |                       |
   |                       help: use `loop`
   |
   = note: #[warn(while_true)] on by default