FTBFS with current Rust version

[bluet]

matthew@0xB1uE7:/workspace/rust-playground/color-rs$ rustc -V
rustc 1.0.0-dev (built 2015-03-15)
matthew@0xB1uE7:/workspace/rust-playground/color-rs$ cargo -V
cargo 0.0.1-pre (2d2e039 2015-03-14) (built 2015-03-16)

matthew@0xB1uE7:~/workspace/rust-playground/color-rs$ cargo build
Compiling color v0.0.1 (file:///home/matthew/workspace/rust-playground/color-rs)
src/alpha.rs:19:38: 19:42 warning: derive(Show) is deprecated in favor of derive(Debug)
src/alpha.rs:19 #[derive(Clone, Copy, PartialEq, Eq, Show)]
^~~~
src/hsv.rs:26:38: 26:42 warning: derive(Show) is deprecated in favor of derive(Debug)
src/hsv.rs:26 #[derive(Clone, Copy, PartialEq, Eq, Show)]
^~~~
src/rgb.rs:22:38: 22:42 warning: derive(Show) is deprecated in favor of derive(Debug)
src/rgb.rs:22 #[derive(Clone, Copy, PartialEq, Eq, Show)]
^~~~
src/srgb.rs:16:38: 16:42 warning: derive(Show) is deprecated in favor of derive(Debug)
src/srgb.rs:16 #[derive(Clone, Copy, PartialEq, Eq, Show)]
^~~~
src/ycbcr.rs:18:38: 18:42 warning: derive(Show) is deprecated in favor of derive(Debug)
src/ycbcr.rs:18 #[derive(Clone, Copy, PartialEq, Eq, Show)]
^~~~
src/channel.rs:21:12: 21:29 warning: use of unstable library feature 'core': trait is likely to be removed
src/channel.rs:21 fn cast<T: std::num::NumCast, U: std::num::NumCast>(n: T) -> U {
^~~~~~~~~~~~~~~~~
src/channel.rs:21:29: 21:29 help: add #![feature(core)] to the crate attributes to silence this warning
src/channel.rs:21:34: 21:51 warning: use of unstable library feature 'core': trait is likely to be removed
src/channel.rs:21 fn cast<T: std::num::NumCast, U: std::num::NumCast>(n: T) -> U {
^~~~~~~~~~~~~~~~~
src/channel.rs:21:51: 21:51 help: add #![feature(core)] to the crate attributes to silence this warning
src/channel.rs:22:5: 22:19 warning: use of unstable library feature 'core': likely to be removed
src/channel.rs:22 std::num::cast(n).unwrap()
^~~~~~~~~~~~~~
src/channel.rs:22:19: 22:19 help: add #![feature(core)] to the crate attributes to silence this warning
src/hsv.rs:22:12: 22:24 warning: use of unstable library feature 'core': trait is likely to be removed
src/hsv.rs:22 fn cast<T: num::NumCast, U: num::NumCast>(n: T) -> U {
^~~~~~~~~~~~
src/hsv.rs:22:24: 22:24 help: add #![feature(core)] to the crate attributes to silence this warning
src/hsv.rs:22:29: 22:41 warning: use of unstable library feature 'core': trait is likely to be removed
src/hsv.rs:22 fn cast<T: num::NumCast, U: num::NumCast>(n: T) -> U {
^~~~~~~~~~~~
src/hsv.rs:22:41: 22:41 help: add #![feature(core)] to the crate attributes to silence this warning
src/hsv.rs:23:5: 23:14 warning: use of unstable library feature 'core': likely to be removed
src/hsv.rs:23 num::cast(n).unwrap()
^~~~~~~~~
src/hsv.rs:23:14: 23:14 help: add #![feature(core)] to the crate attributes to silence this warning
src/hsv.rs:116:22: 116:32 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:116 let one: T = Float::one();
^~~~~~~~~~
src/hsv.rs:116:32: 116:32 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:117:49: 117:59 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:117 let x = chr * (one - ((h % cast(2u8)) - Float::one()).abs());
^~~~~~~~~~
src/hsv.rs:117:59: 117:59 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:120:62: 120:73 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:120 if h < cast(1u8) { Rgb::new(chr.clone(), x, Float::zero()) }
^~~~~~~~~~~
src/hsv.rs:120:73: 120:73 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:121:62: 121:73 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:121 else if h < cast(2u8) { Rgb::new(x, chr.clone(), Float::zero()) }
^~~~~~~~~~~
src/hsv.rs:121:73: 121:73 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:122:46: 122:57 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:122 else if h < cast(3u8) { Rgb::new(Float::zero(), chr.clone(), x) }
^~~~~~~~~~~
src/hsv.rs:122:57: 122:57 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:123:46: 123:57 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:123 else if h < cast(4u8) { Rgb::new(Float::zero(), x, chr.clone()) }
^~~~~~~~~~~
src/hsv.rs:123:57: 123:57 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:124:49: 124:60 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:124 else if h < cast(5u8) { Rgb::new(x, Float::zero(), chr.clone()) }
^~~~~~~~~~~
src/hsv.rs:124:60: 124:60 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:125:59: 125:70 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:125 else if h < cast(6u8) { Rgb::new(chr.clone(), Float::zero(), x) }
^~~~~~~~~~~
src/hsv.rs:125:70: 125:70 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:126:46: 126:57 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:126 else { Rgb::new(Float::zero(), Float::zero(), Float::zero()) };
^~~~~~~~~~~
src/hsv.rs:126:57: 126:57 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:126:61: 126:72 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:126 else { Rgb::new(Float::zero(), Float::zero(), Float::zero()) };
^~~~~~~~~~~
src/hsv.rs:126:72: 126:72 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/hsv.rs:126:76: 126:87 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/hsv.rs:126 else { Rgb::new(Float::zero(), Float::zero(), Float::zero()) };
^~~~~~~~~~~
src/hsv.rs:126:87: 126:87 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/rgb.rs:25:12: 25:24 warning: use of unstable library feature 'core': trait is likely to be removed
src/rgb.rs:25 fn cast<T: num::NumCast, U: num::NumCast>(n: T) -> U {
^~~~~~~~~~~~
src/rgb.rs:25:24: 25:24 help: add #![feature(core)] to the crate attributes to silence this warning
src/rgb.rs:25:29: 25:41 warning: use of unstable library feature 'core': trait is likely to be removed
src/rgb.rs:25 fn cast<T: num::NumCast, U: num::NumCast>(n: T) -> U {
^~~~~~~~~~~~
src/rgb.rs:25:41: 25:41 help: add #![feature(core)] to the crate attributes to silence this warning
src/rgb.rs:26:5: 26:14 warning: use of unstable library feature 'core': likely to be removed
src/rgb.rs:26 num::cast(n).unwrap()
^~~~~~~~~
src/rgb.rs:26:14: 26:14 help: add #![feature(core)] to the crate attributes to silence this warning
src/rgb.rs:119:19: 119:30 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/rgb.rs:119 if chr != Float::zero() {
^~~~~~~~~~~
src/rgb.rs:119:30: 119:30 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/rgb.rs:131:22: 131:33 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/rgb.rs:131 Hsv::new(Float::zero(), Float::zero(), mx)
^~~~~~~~~~~
src/rgb.rs:131:33: 131:33 help: add #![feature(std_misc)] to the crate attributes to silence this warning
src/rgb.rs:131:37: 131:48 warning: use of unstable library feature 'std_misc': unsure about its place in the world
src/rgb.rs:131 Hsv::new(Float::zero(), Float::zero(), mx)
^~~~~~~~~~~
src/rgb.rs:131:48: 131:48 help: add #![feature(std_misc)] to the crate attributes to silence this warning

[bluet]

As this module is introduces by http://doc.crates.io/guide.html
I guess it shouldn't be failed on build?