error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
  --> $DIR/issue-49934.rs:10:5
   |
LL |     #[derive(Debug)]
   |     ^^^^^^^^^^^^^^^^ not applicable here
LL |     println!("Hello, world!");
   |     -------------------------- not a `struct`, `enum` or `union`

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
  --> $DIR/issue-49934.rs:14:5
   |
LL |     #[derive(Debug)]
   |     ^^^^^^^^^^^^^^^^ not applicable here
LL |     "Hello, world!";
   |     ---------------- not a `struct`, `enum` or `union`

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
  --> $DIR/issue-49934.rs:18:5
   |
LL |     #[derive(Debug)]
   |     ^^^^^^^^^^^^^^^^ not applicable here
LL |     let _ = "Hello, world!";
   |     ------------------------ not a `struct`, `enum` or `union`

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
  --> $DIR/issue-49934.rs:22:13
   |
LL |     let _ = #[derive(Debug)] "Hello, world!";
   |             ^^^^^^^^^^^^^^^^ --------------- not a `struct`, `enum` or `union`
   |             |
   |             not applicable here

error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
  --> $DIR/issue-49934.rs:27:9
   |
LL |         #[derive(Debug)]
   |         ^^^^^^^^^^^^^^^^ not applicable here
LL |         "Hello, world!",
   |         --------------- not a `struct`, `enum` or `union`

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0774`.