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reference.md: clarify the limitation of type alias on an enum

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Cf. rust-lang/rust#26264

Signed-off-by: NODA, Kai <nodakai@gmail.com>
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NODA, Kai 2016-02-15 08:13:08 +08:00
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src/doc/reference.md
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@ -1118,6 +1118,16 @@ type Point = (u8, u8);
let p: Point = (41, 68);
```
Currently a type alias to an enum type cannot be used to qualify the
constructors:
```
enum E { A }
type F = E;
let _: F = E::A; // OK
// let _: F = F::A; // Doesn't work
```
### Structs
A _struct_ is a nominal [struct type](#struct-types) defined with the