[INFO] updating cached repository MoreAxes/som
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MoreAxes/som
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MoreAxes/som" "work/ex/beta-1.38-1/sources/1.37.0/gh/MoreAxes/som"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/MoreAxes/som'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MoreAxes/som" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MoreAxes/som"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MoreAxes/som'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5f0f2cb31bf1f93c7d1dee89ab9aec7ec0cf4678
[INFO] sha for GitHub repo MoreAxes/som: 5f0f2cb31bf1f93c7d1dee89ab9aec7ec0cf4678
[INFO] validating manifest of MoreAxes/som 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 MoreAxes/som 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 MoreAxes/som
[INFO] finished frobbing MoreAxes/som
[INFO] frobbed toml for MoreAxes/som written to work/ex/beta-1.38-1/sources/1.37.0/gh/MoreAxes/som/Cargo.toml
[INFO] started frobbing MoreAxes/som
[INFO] finished frobbing MoreAxes/som
[INFO] frobbed toml for MoreAxes/som written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MoreAxes/som/Cargo.toml
[INFO] crate MoreAxes/som 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing MoreAxes/som against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MoreAxes/som:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] d6828c15a9ecc58621facf9b5d6f1d38ab99aca34d24981902cfdb02fb912100
[INFO] running `"docker" "start" "-a" "d6828c15a9ecc58621facf9b5d6f1d38ab99aca34d24981902cfdb02fb912100"`
[INFO] [stderr]    Compiling gcc v0.3.39
[INFO] [stderr]    Compiling phf_shared v0.7.20
[INFO] [stderr]    Compiling quote v0.3.10
[INFO] [stderr]    Compiling serde v0.8.19
[INFO] [stderr]    Compiling num v0.1.36
[INFO] [stderr]    Compiling jpeg-decoder v0.1.8
[INFO] [stderr]    Compiling ctrlc v2.0.1
[INFO] [stderr]    Compiling enum_primitive v0.1.0
[INFO] [stderr]    Compiling phf_generator v0.7.20
[INFO] [stderr]    Compiling phf v0.7.20
[INFO] [stderr]    Compiling phf_codegen v0.7.20
[INFO] [stderr]    Compiling syn v0.10.3
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]    Compiling miniz-sys v0.1.7
[INFO] [stderr]    Compiling flate2 v0.2.14
[INFO] [stderr]    Compiling png v0.5.2
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.1
[INFO] [stderr]    Compiling serde_json v0.8.4
[INFO] [stderr]    Compiling serde_codegen v0.8.19
[INFO] [stderr]    Compiling image v0.10.4
[INFO] [stderr]    Compiling serde_derive v0.8.19
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.19/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro, proc_macro_lib)]
[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 `serde_derive`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d6828c15a9ecc58621facf9b5d6f1d38ab99aca34d24981902cfdb02fb912100"`
[INFO] running `"docker" "rm" "-f" "d6828c15a9ecc58621facf9b5d6f1d38ab99aca34d24981902cfdb02fb912100"`
[INFO] [stdout] d6828c15a9ecc58621facf9b5d6f1d38ab99aca34d24981902cfdb02fb912100