src/test/ui/feature-gates/feature-gate-marker_trait_attr.rs

   1 use std::fmt::{Debug, Display};
   2
   3 #[marker] trait ExplicitMarker {}
   4 //~^ ERROR the `#[marker]` attribute is an experimental feature
   5
   6 impl<T: Display> ExplicitMarker for T {}
   7 impl<T: Debug> ExplicitMarker for T {}
   8
   9 fn main() {}