error: `#[marker]` attribute cannot be used on structs
  --> $DIR/marker-attribute-on-non-trait.rs:3:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: `#[marker]` attribute cannot be used on inherent impl blocks
  --> $DIR/marker-attribute-on-non-trait.rs:6:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: `#[marker]` attribute cannot be used on unions
  --> $DIR/marker-attribute-on-non-trait.rs:9:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: `#[marker]` attribute cannot be used on constants
  --> $DIR/marker-attribute-on-non-trait.rs:14:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: `#[marker]` attribute cannot be used on functions
  --> $DIR/marker-attribute-on-non-trait.rs:17:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: `#[marker]` attribute cannot be used on type aliases
  --> $DIR/marker-attribute-on-non-trait.rs:20:1
   |
LL | #[marker]
   | ^^^^^^^^^
   |
   = help: `#[marker]` can only be applied to traits

error: aborting due to 6 previous errors