我的代码似乎运行正常，除了一个由旧版本的rustc＆＃34;编译的箱子。
缩短产量：
Using worker: worker-linux-docker-1a1baae3.prod.travis-ci.org:travis-linux-8
1.30s$ git clone --depth=50 https://github.com/cpjreynolds/rustty.git cpjreynolds/rustty
Cloning into 'cpjreynolds/rustty'...
rustup: extracting installer
rustup: installing toolchain for 'nightly'
install: creating uninstall script at /home/travis/rust/lib/rustlib/uninstall.sh
install: installing component 'rustc'
install: installing component 'rust-std-x86_64-unknown-linux-gnu'
install: installing component 'rust-docs'
install: installing component 'cargo'
Rust is ready to roll.
0.00s0.00s0.00s$ rustc --version
rustc 1.6.0-nightly (1a2eaffb6 2015-10-31)
$ cargo --version
cargo 0.7.0-nightly (8acff56 2015-10-31)
5.93s$ cargo build --verbose
Updating registry `https://github.com/rust-lang/crates.io-index`
Downloading winapi-build v0.1.1
Downloading gag v0.1.6
Downloading nix v0.4.1
Downloading lazy_static v0.1.15
Downloading advapi32-sys v0.1.2
Downloading bitflags v0.3.2
Downloading term v0.2.12
Downloading rand v0.3.11
Downloading libc v0.1.12
Downloading tempfile v1.1.1
Downloading libc v0.2.0
Downloading winapi v0.2.4
Downloading kernel32-sys v0.1.4
Fresh winapi-build v0.1.1
Fresh lazy_static v0.1.15
Fresh winapi v0.2.4
Fresh libc v0.2.0
Fresh libc v0.1.12
Fresh bitflags v0.3.2
Fresh nix v0.4.1
Fresh kernel32-sys v0.1.4
Fresh advapi32-sys v0.1.2
Fresh term v0.2.12
Fresh rand v0.3.11
Fresh tempfile v1.1.1
Fresh gag v0.1.6
Compiling rustty v0.1.9 (file:///home/travis/build/cpjreynolds/rustty)
Running `rustc src/lib.rs --crate-name rustty --crate-type lib -g --out-dir /home/travis/build/cpjreynolds/rustty/target/debug --emit=dep-info,link -L dependency=/home/travis/build/cpjreynolds/rustty/target/debug -L dependency=/home/travis/build/cpjreynolds/rustty/target/debug/deps --extern nix=/home/travis/build/cpjreynolds/rustty/target/debug/deps/libnix-decfdf7b683bd511.rlib --extern term=/home/travis/build/cpjreynolds/rustty/target/debug/deps/libterm-c60a08d637b7e6c7.rlib --extern lazy_static=/home/travis/build/cpjreynolds/rustty/target/debug/deps/liblazy_static-f3aa6dfcc7c157cc.rlib --extern gag=/home/travis/build/cpjreynolds/rustty/target/debug/deps/libgag-71f01cbae2611a97.rlib --extern libc=/home/travis/build/cpjreynolds/rustty/target/debug/deps/liblibc-29adb837ec836726.rlib`
src/lib.rs:20:14: 20:39 error: the crate `lazy_static` has been compiled with an old version of rustc, which is incompatible with this version of rustc [E0514]
src/lib.rs:20 #[macro_use] extern crate lazy_static;
为什么使用nightly编译器构建lazy_static包时会失败？
编辑：.travis.yml
language: rust
rust:
- nightly
- beta
- stable
cache:
directories:
- target
script:
- cargo build --verbose
- cargo test --verbose
- cargo doc
after_success:
test $TRAVIS_PULL_REQUEST == "false" &&
test $TRAVIS_BRANCH == "master" &&
test $TRAVIS_RUST_VERSION == "stable" &&
sh etc/deploy-docs.sh