error[E0658]: discriminants on non-unit variants are experimental
  --> $DIR/feature-gate-arbitrary_enum_discriminant.rs:6:13
   |
LL |   Tuple() = 2,
   |             ^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/60553
   = help: add `#![feature(arbitrary_enum_discriminant)]` to the crate attributes to enable

error[E0658]: discriminants on non-unit variants are experimental
  --> $DIR/feature-gate-arbitrary_enum_discriminant.rs:8:14
   |
LL |   Struct{} = 3,
   |              ^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/60553
   = help: add `#![feature(arbitrary_enum_discriminant)]` to the crate attributes to enable

error[E0658]: custom discriminant values are not allowed in enums with tuple or struct variants
  --> $DIR/feature-gate-arbitrary_enum_discriminant.rs:4:10
   |
LL |   Unit = 1,
   |          ^ disallowed custom discriminant
LL |
LL |   Tuple() = 2,
   |   ----------- tuple variant defined here
LL |
LL |   Struct{} = 3,
   |   ------------ struct variant defined here
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/60553
   = help: add `#![feature(arbitrary_enum_discriminant)]` to the crate attributes to enable

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.