...and cleanup, making how we handle version numbers more rational
(specifically, not passing in a versioned name to rustc
with the -o flag), and removing unused code.
Addressing issue #6037, this Scheme-style conditional helps to improve code clarity in instances where the `if`, `else if`, and `else` keywords obscure predicates undesirably.
Here is an example:
~~~rust
let clamped =
if x > mx { mx }
else if x < mn { mn }
else { x };
~~~
Using `cond!`, the above could be written as:
~~~rust
let clamped = cond!(
(x > mx) { mx }
(x < mn) { mn }
_ { x }
);
~~~
The optional default case is denoted by `_`.
I have altered `std::fun_treemap` to demonstrate it in use. I am definitely interested in using it for some of the numeric functions, but I will have to wait for it to reach `stage0` first.
This patch implements package IDs like
github.com/catamorphism/test-pkg.
To support such package IDs, I changed the PkgId struct to contain
a LocalPath and a RemotePath field, where the RemotePath reflects
the actual URL and the LocalPath reflects the file name of the cached
copy. Right now, the only difference is that the local path doesn't
contain dashes, but this will change when we implement #6407.
Also, PkgIds now have a short_name field -- though the short name
can be derived from the LocalPath, I thought it was cleaner not to
call option::get() wantonly.
`std::ratio` module contains `BigRational` type, but the type is not usable by following reasons.
* `Ratio::new` requires `T: Copy + Num + Ord`, but `BigInt` is not implicitly copyable, because it contains unique vector.
* `BigInt` is not implements `Num`
So, I rewrite `Ratio` as follows.
* `Ratio` requires `T: Clone + Integer + Ord`.
* `Copy` -> `Clone`: to be able to use `BigRational`
* `Num` -> `Integer`: It is incorrect that a rational number constructed by two non-integer numbers.
* `BigInt` implements `Num` and `Orderable` which are required by `Integer` bound
