1 error[E0369]: cannot add `&str` to `&str`
2 --> $DIR/issue-47377.rs:4:14
4 LL | let _a = b + ", World!";
7 | | `+` cannot be used to concatenate two `&str` strings
10 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
12 LL | let _a = b.to_owned() + ", World!";
15 error: aborting due to previous error
17 For more information about this error, try `rustc --explain E0369`.