[Proposal] As-patterns from haskell

[Corvo Liu]

In haskell there's a syntax sugar called as pattern. For example:

```

f (x:xs)                = x:x:xs

```

maybe rewrite as:

```
f s@(x:xs)             = x:s

```

This feature is useful, and I constantly find there's places in my code that I can use it to make my code more concise.

[Andrey Yugai]

Could you provide an elixir example with proposed new syntax, for those who is not familiar with haskell?

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[Corvo Liu]

NVM I found elixir can do this straightforwardly with a sequence of pattern:

```

a = {c, _} = {1, 2}

```