1error: expected a literal 2 --> $DIR/bad-concat.rs:5:21 3 | 4LL | let _ = concat!(x, y, z, "bar"); 5 | ^ ^ ^ 6 | 7 = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()` 8 9error: aborting due to previous error 10 11