error[E0369]: binary operation `+` cannot be applied to type `&std::string::String` | |
--> $DIR/str-concat-on-double-ref.rs:14:13 | |
| | |
LL | let c = a + b; | |
| ^^^^^ | |
| | |
= note: an implementation of `std::ops::Add` might be missing for `&std::string::String` | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0369`. |