1 error[E0369]: binary operation `+` cannot be applied to type `&str`
2 --> $DIR/issue-47380.rs:12:33
4 LL | println!("🦀🦀🦀🦀🦀"); let _a = b + ", World!";
5 | ^^^^^^^^^^^^^^ `+` can't be used to concatenate two `&str` strings
6 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
8 LL | println!("🦀🦀🦀🦀🦀"); let _a = b.to_owned() + ", World!";
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0369`.