type_alias_enum_variants -

# `type_alias_enum_variants`

The tracking issue for this feature is: #49683

The `type_alias_enum_variants` feature enables the use of variants on type aliases that refer to enums, as both a constructor and a pattern. That is, it allows for the syntax `EnumAlias::Variant`, which behaves exactly the same as `Enum::Variant` (assuming that `EnumAlias` is an alias for some enum type `Enum`).

Note that since `Self` exists as a type alias, this feature also enables the use of the syntax `Self::Variant` within an impl block for an enum type.

    #![feature(type_alias_enum_variants)]

    enum Foo {
        Bar(i32),
        Baz { i: i32 },
    }

    type Alias = Foo;

    fn main() {
        let t = Alias::Bar(0);
        let t = Alias::Baz { i: 0 };
        match t {
            Alias::Bar(_i) => {}
            Alias::Baz { i: _i } => {}
        }
    }