error: trait object `dyn Send` cannot be used in patterns
  --> $DIR/issue-70972-dyn-trait.rs:6:9
   |
LL | const F: &'static dyn Send = &7u32;
   | -------------------------- constant defined here
...
LL |         F => panic!(),
   |         ^ trait object can't be used in patterns

error: aborting due to 1 previous error