[INFO] updating cached repository romuloalves/rust-random-number
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/romuloalves/rust-random-number
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/romuloalves/rust-random-number" "work/ex/beta-1.38-1/sources/1.37.0/gh/romuloalves/rust-random-number"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/romuloalves/rust-random-number'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/romuloalves/rust-random-number" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/romuloalves/rust-random-number"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/romuloalves/rust-random-number'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d9f8f3ecc22ec829b4844f369c4cd1a3c38cf866
[INFO] sha for GitHub repo romuloalves/rust-random-number: d9f8f3ecc22ec829b4844f369c4cd1a3c38cf866
[INFO] validating manifest of romuloalves/rust-random-number 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 romuloalves/rust-random-number 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 romuloalves/rust-random-number
[INFO] finished frobbing romuloalves/rust-random-number
[INFO] frobbed toml for romuloalves/rust-random-number written to work/ex/beta-1.38-1/sources/1.37.0/gh/romuloalves/rust-random-number/Cargo.toml
[INFO] started frobbing romuloalves/rust-random-number
[INFO] finished frobbing romuloalves/rust-random-number
[INFO] frobbed toml for romuloalves/rust-random-number written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/romuloalves/rust-random-number/Cargo.toml
[INFO] crate romuloalves/rust-random-number 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing romuloalves/rust-random-number 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/romuloalves/rust-random-number:/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] 391f9b88717d5e409366df8c1fcda228d9188d3504c1273191fc73688d94e180
[INFO] running `"docker" "start" "-a" "391f9b88717d5e409366df8c1fcda228d9188d3504c1273191fc73688d94e180"`
[INFO] [stderr] warning: dependency (rocket_contrib) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling unicode-normalization v0.1.3
[INFO] [stderr]    Compiling libc v0.2.19
[INFO] [stderr]    Compiling unicode-bidi v0.2.4
[INFO] [stderr]    Compiling toml v0.2.1
[INFO] [stderr]    Compiling rocket_codegen v0.1.5
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling unicase v1.4.0
[INFO] [stderr]    Compiling term v0.4.4
[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/rocket_codegen-0.1.5/build.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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 `rocket_codegen`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "391f9b88717d5e409366df8c1fcda228d9188d3504c1273191fc73688d94e180"`
[INFO] running `"docker" "rm" "-f" "391f9b88717d5e409366df8c1fcda228d9188d3504c1273191fc73688d94e180"`
[INFO] [stdout] 391f9b88717d5e409366df8c1fcda228d9188d3504c1273191fc73688d94e180