[MacPorts] #32971: Add "Rust" to the ports tree

[MacPorts]

#32971: Add "Rust" to the ports tree
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 Reporter:  macports.org@…             |       Owner:  macports-tickets@…                   
     Type:  request                    |      Status:  new                                  
 Priority:  Normal                     |   Milestone:                                       
Component:  ports                      |     Version:  2.0.3                                
 Keywords:  rust rust-lang             |        Port:                                       
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 [https://mail.mozilla.org/pipermail/rust-dev/2012-January/001256.html Rust
 0.1 was officially released yesterday]. Rust is an interesting take on the
 systems language: it goes for roughly the same niche as Go, but its
 designers have decided to make it both lower-level at run-time and safer
 (by increasing compile-time guarantees and checkability). [http://www
 .rust-lang.org/ Its website] describes it as:

 > Rust is a curly-brace, block-structured expression language. It visually
 resembles the C language family, but differs significantly in syntactic
 and semantic details. Its design is oriented toward concerns of
 “programming in the large”, that is, of creating and maintaining
 boundaries – both abstract and operational – that preserve large-system
 integrity, availability and concurrency.

 From the release mail,

 * the 0.1 tarball can be found at: http://dl.rust-
 lang.org/dist/rust-0.1.tar.gz
 * signature file: http://dl.rust-lang.org/dist/rust-0.1.tar.gz.asc
 * SHA-256 hash:
 a1a234592168443b3bd6dce03378ee410393b07f8075c6a56e339638fdda8263

 A `./configure; make` was sufficient to build a working compiler on my
 10.6 machine, although the build process fetches a stage0 compiler (the
 rust compiler is written in rust) on the internet, I do not know if that
 fits in the normal Macports practices. It also builds a full LLVM, maybe
 it could depend on the macports-provided LLVM instead (not sure which
 version is needed, it built a 3.1dev from today)

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Ticket URL: <https://trac.macports.org/ticket/32971>
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