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