error[E0081]: discriminant value `0` assigned more than once
  --> $DIR/tag-variant-disr-dup.rs:3:1
   |
LL | / enum Color {
LL | |
LL | |     Red = 0xff0000,
LL | |     Green = 0x00ff00,
LL | |     Blue = 0x0000ff,
LL | |     Black = 0x000000,
   | |             -------- first assignment of `0`
LL | |     White = 0x000000,
   | |             -------- second assignment of `0`
LL | | }
   | |_^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0081`.