error[E0369]: no implementation for `String ^ String`
  --> $DIR/binop-bitxor-str.rs:3:37
   |
LL | fn main() { let x = "a".to_string() ^ "b".to_string(); }
   |                     --------------- ^ --------------- String
   |                     |
   |                     String
   |
note: the foreign item type `String` doesn't implement `BitXor`
  --> $SRC_DIR/alloc/src/string.rs:LL:COL
   |
   = note: not implement `BitXor`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0369`.