error[E0368]: binary assignment operation `+=` cannot be applied to type `&str` | |
--> $DIR/issue-10401.rs:13:5 | |
| | |
LL | a += { "b" }; | |
| -^^^^^^^^^^^ | |
| | | |
| cannot use `+=` on type `&str` | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0368`. |