Deprecate libnum in favor of rust-lang/num

This is part of the migration of crates into the Cargo ecosystem. There
is now an external repository https://github.com/rust-lang/num for bignums.

The single use of libnum elsewhere in the repository is for a shootout
benchmark, which is being moved into the external crate.

Due to deprecation, this is a:

[breaking-change]

3 files changed, 3 insertions, 130 deletions

diff --git a/src/etc/licenseck.py b/src/etc/licenseck.py
index 328a2ff6c94..d1b115fc913 100644
--- a/src/etc/licenseck.py
+++ b/src/etc/licenseck.py
@@ -49,7 +49,6 @@ exceptions = [
     "test/bench/shootout-mandelbrot.rs", # BSD
     "test/bench/shootout-meteor.rs", # BSD
     "test/bench/shootout-nbody.rs", # BSD
-    "test/bench/shootout-pidigits.rs", # BSD
     "test/bench/shootout-regex-dna.rs", # BSD
     "test/bench/shootout-reverse-complement.rs", # BSD
     "test/bench/shootout-threadring.rs", # BSD
diff --git a/src/libnum/lib.rs b/src/libnum/lib.rs
index f12279b20e8..43fe82ee899 100644
--- a/src/libnum/lib.rs
+++ b/src/libnum/lib.rs
@@ -46,7 +46,9 @@
 #![feature(default_type_params)]
 
 #![crate_name = "num"]
-#![experimental]
+#![deprecated = "This is now a cargo package located at: \
+                 https://github.com/rust-lang/num"]
+#![allow(deprecated)]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
 #![license = "MIT/ASL2"]
diff --git a/src/test/bench/shootout-pidigits.rs b/src/test/bench/shootout-pidigits.rs
deleted file mode 100644
index d22633b3412..00000000000
--- a/src/test/bench/shootout-pidigits.rs
+++ /dev/null
@@ -1,128 +0,0 @@
-// The Computer Language Benchmarks Game
-// http://benchmarksgame.alioth.debian.org/
-//
-// contributed by the Rust Project Developers
-
-// Copyright (c) 2013-2014 The Rust Project Developers
-//
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-//
-// - Redistributions of source code must retain the above copyright
-//   notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-//   notice, this list of conditions and the following disclaimer in
-//   the documentation and/or other materials provided with the
-//   distribution.
-//
-// - Neither the name of "The Computer Language Benchmarks Game" nor
-//   the name of "The Computer Language Shootout Benchmarks" nor the
-//   names of its contributors may be used to endorse or promote
-//   products derived from this software without specific prior
-//   written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-// OF THE POSSIBILITY OF SUCH DAMAGE.
-
-extern crate num;
-
-use std::from_str::FromStr;
-use std::num::One;
-use std::num::Zero;
-use std::num::FromPrimitive;
-use num::Integer;
-use num::bigint::BigInt;
-
-struct Context {
-    numer: BigInt,
-    accum: BigInt,
-    denom: BigInt,
-}
-
-impl Context {
-    fn new() -> Context {
-        Context {
-            numer: One::one(),
-            accum: Zero::zero(),
-            denom: One::one(),
-        }
-    }
-
-    fn from_int(i: int) -> BigInt {
-        FromPrimitive::from_int(i).unwrap()
-    }
-
-    fn extract_digit(&self) -> int {
-        if self.numer > self.accum {return -1;}
-        let (q, r) =
-            (self.numer * Context::from_int(3) + self.accum)
-            .div_rem(&self.denom);
-        if r + self.numer >= self.denom {return -1;}
-        q.to_int().unwrap()
-    }
-
-    fn next_term(&mut self, k: int) {
-        let y2 = Context::from_int(k * 2 + 1);
-        self.accum = (self.accum + (self.numer << 1)) * y2;
-        self.numer = self.numer * Context::from_int(k);
-        self.denom = self.denom * y2;
-    }
-
-    fn eliminate_digit(&mut self, d: int) {
-        let d = Context::from_int(d);
-        let ten = Context::from_int(10);
-        self.accum = (self.accum - self.denom * d) * ten;
-        self.numer = self.numer * ten;
-    }
-}
-
-fn pidigits(n: int) {
-    let mut k = 0;
-    let mut context = Context::new();
-
-    for i in range(1, n + 1) {
-        let mut d;
-        loop {
-            k += 1;
-            context.next_term(k);
-            d = context.extract_digit();
-            if d != -1 {break;}
-        }
-
-        print!("{}", d);
-        if i % 10 == 0 {print!("\t:{}\n", i);}
-
-        context.eliminate_digit(d);
-    }
-
-    let m = n % 10;
-    if m != 0 {
-        for _ in range(m, 10) { print!(" "); }
-        print!("\t:{}\n", n);
-    }
-}
-
-fn main() {
-    let args = std::os::args();
-    let args = args.as_slice();
-    let n = if args.len() < 2 {
-        512
-    } else {
-        FromStr::from_str(args[1].as_slice()).unwrap()
-    };
-    pidigits(n);
-}