src/test/ui/issues/issue-47377.stderr

   1 error[E0369]: binary operation `+` cannot be applied to type `&str`
   2   --> $DIR/issue-47377.rs:4:14
   3    |
   4 LL |      let _a = b + ", World!";
   5    |               - ^ ---------- &str
   6    |               | |
   7    |               | `+` cannot be used to concatenate two `&str` strings
   8    |               &str
   9    |
  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
  11    |
  12 LL |      let _a = b.to_owned() + ", World!";
  13    |               ^^^^^^^^^^^^
  14
  15 error: aborting due to previous error
  16
  17 For more information about this error, try `rustc --explain E0369`.