[INFO] cloning repository https://github.com/theduke/rust-serialization-benchmarks
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/theduke/rust-serialization-benchmarks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftheduke%2Frust-serialization-benchmarks"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftheduke%2Frust-serialization-benchmarks'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4d24c6531d75942ef58ef4005e6dbb8f661b2225
[INFO] checking theduke/rust-serialization-benchmarks against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftheduke%2Frust-serialization-benchmarks" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/theduke/rust-serialization-benchmarks on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "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 /workspace/builds/worker-7/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 `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "+b61e69433951e31f7bd746e22f516a48ad41623b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cc20d9a3a32cab21f87c5d4753149dd3551780b10a1f472a1eaed366d9525236
[INFO] running `"docker" "start" "-a" "cc20d9a3a32cab21f87c5d4753149dd3551780b10a1f472a1eaed366d9525236"`
[INFO] [stderr]     Checking bencher v0.1.2 (https://github.com/theduke/bencher.git#59ee1f8f)
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking serde_test v0.8.21
[INFO] [stderr]    Compiling syn v0.10.5
[INFO] [stderr]     Checking rmp v0.8.1
[INFO] [stderr]     Checking bincode v0.6.1
[INFO] [stderr]     Checking cbor v0.4.0
[INFO] [stderr]     Checking serde_cbor v0.4.0
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking rmp-serde v0.11.0
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking num-bigint v0.1.35
[INFO] [stderr]     Checking rust-crypto v0.2.36
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking serde-pickle v0.2.0
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]     Checking serde_yaml v0.5.0
[INFO] [stderr]    Compiling serde_codegen v0.8.21
[INFO] [stderr]     Checking serde-hjson v0.8.1
[INFO] [stderr]    Compiling serde_derive v0.8.21
[INFO] [stderr]     Checking bson v0.3.2
[INFO] [stderr]     Checking rust_serialization_benchmark v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro)]
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `step_by`
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(step_by)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro)]
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `step_by`
[INFO] [stderr]  --> src/main.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(step_by)]
[INFO] [stderr]   |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0635`.
[INFO] [stderr] error: could not compile `rust_serialization_benchmark`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rust_serialization_benchmark`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cc20d9a3a32cab21f87c5d4753149dd3551780b10a1f472a1eaed366d9525236"`
[INFO] running `"docker" "rm" "-f" "cc20d9a3a32cab21f87c5d4753149dd3551780b10a1f472a1eaed366d9525236"`
[INFO] [stdout] cc20d9a3a32cab21f87c5d4753149dd3551780b10a1f472a1eaed366d9525236