error[E0539]: malformed `deprecated` attribute input
  --> $DIR/invalid-literal.rs:1:1
   |
LL | #[deprecated = b"test"]
   | ^^^^^^^^^^^^^^^-^^^^^^^
   |                |
   |                help: consider removing the prefix
   |
   = note: expected a normal string literal, not a byte string literal

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0539`.