[INFO] updating cached repository stlk/os-in-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/stlk/os-in-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/stlk/os-in-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/stlk/os-in-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/stlk/os-in-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/stlk/os-in-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stlk/os-in-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stlk/os-in-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 87a0aac241d98405d1e6074b17c61e88f6dfd8d6
[INFO] sha for GitHub repo stlk/os-in-rust: 87a0aac241d98405d1e6074b17c61e88f6dfd8d6
[INFO] validating manifest of stlk/os-in-rust on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of stlk/os-in-rust on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing stlk/os-in-rust
[INFO] finished frobbing stlk/os-in-rust
[INFO] frobbed toml for stlk/os-in-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/stlk/os-in-rust/Cargo.toml
[INFO] started frobbing stlk/os-in-rust
[INFO] finished frobbing stlk/os-in-rust
[INFO] frobbed toml for stlk/os-in-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stlk/os-in-rust/Cargo.toml
[INFO] crate stlk/os-in-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing stlk/os-in-rust against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/stlk/os-in-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] c13354f8dbb892da98198da936f765e0da9e474076823089e7b51f2bad51a3bc
[INFO] running `"docker" "start" "-a" "c13354f8dbb892da98198da936f765e0da9e474076823089e7b51f2bad51a3bc"`
[INFO] [stderr]    Compiling bitflags v0.4.0
[INFO] [stderr]    Compiling spin v0.3.5
[INFO] [stderr]    Compiling rlibc v0.1.5
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/spin-0.3.5/src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(const_fn, asm)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling multiboot2 v0.1.0 (https://github.com/phil-opp/multiboot2-elf64#855463c0)
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `spin`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c13354f8dbb892da98198da936f765e0da9e474076823089e7b51f2bad51a3bc"`
[INFO] running `"docker" "rm" "-f" "c13354f8dbb892da98198da936f765e0da9e474076823089e7b51f2bad51a3bc"`
[INFO] [stdout] c13354f8dbb892da98198da936f765e0da9e474076823089e7b51f2bad51a3bc