1error: cannot concatenate a byte string literal 2 --> $DIR/concat.rs:2:13 3 | 4LL | concat!(b'f'); 5 | ^^^^ 6 7error: cannot concatenate a byte string literal 8 --> $DIR/concat.rs:3:13 9 | 10LL | concat!(b"foo"); 11 | ^^^^^^ 12 13error: expected a literal 14 --> $DIR/concat.rs:4:13 15 | 16LL | concat!(foo); 17 | ^^^ 18 | 19 = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()` 20 21error: expected a literal 22 --> $DIR/concat.rs:5:13 23 | 24LL | concat!(foo()); 25 | ^^^^^ 26 | 27 = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()` 28 29error: aborting due to 4 previous errors 30 31