1 error: cannot concatenate a byte string literal
2 --> $DIR/concat.rs:2:13
7 error: cannot concatenate a byte string literal
8 --> $DIR/concat.rs:3:13
13 error: expected a literal
14 --> $DIR/concat.rs:4:13
19 = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()`
21 error: expected a literal
22 --> $DIR/concat.rs:5:13
27 = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()`
29 error: aborting due to 4 previous errors