LL | let _a = b + ", World!";
| - ^ ---------- &str
| | |
- | | `+` can't be used to concatenate two `&str` strings
+ | | `+` cannot be used to concatenate two `&str` strings
| &str
help: `to_owned()` can be used to create an owned `String` from a string reference. String concatenation appends the string on the right to the string on the left and may require reallocation. This requires ownership of the string on the left
|