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auto merge of #16866 : P1start/rust/tuple-indexing, r=brson

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This allows code to access the fields of tuples and tuple structs behind the feature gate `tuple_indexing`:

```rust
#![feature(tuple_indexing)]

let x = (1i, 2i);
assert_eq!(x.1, 2);

struct Point(int, int);
let origin = Point(0, 0);
assert_eq!(origin.0, 0);
assert_eq!(origin.1, 0);
```

Implements [RFC 53](https://github.com/rust-lang/rfcs/blob/master/active/0053-tuple-accessors.md). Closes #16950.
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bors 2014-09-11 00:05:41 +00:00
commit 09abbbdafc
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@ -2555,6 +2555,8 @@ The currently implemented features of the reference compiler are:
which is considered wildly unsafe and will be
obsoleted by language improvements.
* `tuple_indexing` - Allows use of tuple indexing (expressions like `expr.0`)
If a feature is promoted to a language feature, then all existing programs will
start to receive compilation warnings about #[feature] directives which enabled
the new feature (because the directive is no longer necessary). However, if