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type_alias_enum_variants: Remove from unstable book.

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Mazdak Farrokhzad 2019-06-09 06:49:41 +02:00
parent a70653ac7e
commit 46f405ec4d
1 changed files with 0 additions and 36 deletions
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src/doc/unstable-book/src/language-features/type-alias-enum-variants.md
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# `type_alias_enum_variants`
The tracking issue for this feature is: [#49683]
[#49683]: https://github.com/rust-lang/rust/issues/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.
```rust
#![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 } => {}
}
}
```