error[E0530]: match bindings cannot shadow unit variants
  --> $DIR/issue-27033.rs:3:9
   |
LL |         None @ _ => {}
   |         ^^^^ cannot be named the same as a unit variant
  --> $SRC_DIR/std/src/prelude/mod.rs:LL:COL
   |
   = note: the unit variant `None` is defined here

error[E0530]: match bindings cannot shadow constants
  --> $DIR/issue-27033.rs:7:9
   |
LL |     const C: u8 = 1;
   |     ---------------- the constant `C` is defined here
LL |     match 1 {
LL |         C @ 2 => {
   |         ^ cannot be named the same as a constant

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0530`.