error: unterminated unicode escape
  --> $DIR/new-unicode-escapes-1.rs:2:14
   |
LL |     let s = "\u{2603";
   |              ^^^^^^^ missing a closing `}`
   |
help: terminate the unicode escape
   |
LL |     let s = "\u{2603}";
   |                     +

error: aborting due to previous error