[INFO] updating cached repository https://github.com/theduke/rust-serialization-benchmarks
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4d24c6531d75942ef58ef4005e6dbb8f661b2225
[INFO] testing theduke/rust-serialization-benchmarks against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftheduke%2Frust-serialization-benchmarks" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/theduke/rust-serialization-benchmarks on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/theduke/rust-serialization-benchmarks
[INFO] finished tweaking git repo https://github.com/theduke/rust-serialization-benchmarks
[INFO] tweaked toml for git repo https://github.com/theduke/rust-serialization-benchmarks written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/theduke/rust-serialization-benchmarks already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 9f892b7a585162de8c96c5ac702ff72d6117182d3f4c385d533fcdc20c4e9c63
[INFO] running `"docker" "start" "-a" "9f892b7a585162de8c96c5ac702ff72d6117182d3f4c385d533fcdc20c4e9c63"`
[INFO] [stderr]    Compiling libc v0.2.19
[INFO] [stderr]    Compiling serde v0.8.21
[INFO] [stderr]    Compiling gcc v0.3.41
[INFO] [stderr]    Compiling linked-hash-map v0.0.9
[INFO] [stderr]    Compiling iter-read v0.1.0
[INFO] [stderr]    Compiling bencher v0.1.2 (https://github.com/theduke/bencher.git#59ee1f8f)
[INFO] [stderr]    Compiling syn v0.10.5
[INFO] [stderr]    Compiling rmp v0.8.1
[INFO] [stderr]    Compiling cbor v0.4.0
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling time v0.1.35
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling chrono v0.2.25
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling num-bigint v0.1.35
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling serde_codegen v0.8.21
[INFO] [stderr]    Compiling serde_test v0.8.21
[INFO] [stderr]    Compiling serde-pickle v0.2.0
[INFO] [stderr]    Compiling serde_cbor v0.4.0
[INFO] [stderr]    Compiling toml v0.2.1
[INFO] [stderr]    Compiling rmp-serde v0.11.0
[INFO] [stderr]    Compiling bincode v0.6.1
[INFO] [stderr]    Compiling serde_json v0.8.4
[INFO] [stderr]    Compiling serde_derive v0.8.21
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.21/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" "9f892b7a585162de8c96c5ac702ff72d6117182d3f4c385d533fcdc20c4e9c63"`
[INFO] running `"docker" "rm" "-f" "9f892b7a585162de8c96c5ac702ff72d6117182d3f4c385d533fcdc20c4e9c63"`
[INFO] [stdout] 9f892b7a585162de8c96c5ac702ff72d6117182d3f4c385d533fcdc20c4e9c63