Preliminary submission - std.rational and std.typelist

[FG]

On 2013-02-12 04:03, bearophile wrote:
> But I have not yet understood why D isn't using GMP as Haskell does.

Especially that when you get dynamic libraries working it would create good 
common ground for interoperability.

> In theory Open Source is meant to give a huge help to code reuse, in practice
> you see wheel reinvention all the time. D should use bigints from GMP, a garbage
> collector developed in conjunction with Rust and Mono developers, the back-end
> (that supports 32 bit Windows exceptions) on LLVM, etc.

There's this terrible and often terminal Not-invented-here disease. ;)
Not sure though whether what's possible in Mono's GC can be ported to D.

> Thankfully Phobos uses Curl :o)

Yay!