[INFO] fetching crate bigml 0.9.1...
[INFO] testing bigml-0.9.1 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate bigml 0.9.1 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate bigml 0.9.1 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bigml 0.9.1
[INFO] finished tweaking crates.io crate bigml 0.9.1
[INFO] tweaked toml for crates.io crate bigml 0.9.1 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] crate crates.io crate bigml 0.9.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8b80eb787c0bee842808c9e480204fdc3a958063c92f0d171d6a4c1e5ffd4059
[INFO] running `Command { std: "docker" "start" "-a" "8b80eb787c0bee842808c9e480204fdc3a958063c92f0d171d6a4c1e5ffd4059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b80eb787c0bee842808c9e480204fdc3a958063c92f0d171d6a4c1e5ffd4059", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b80eb787c0bee842808c9e480204fdc3a958063c92f0d171d6a4c1e5ffd4059", kill_on_drop: false }`
[INFO] [stdout] 8b80eb787c0bee842808c9e480204fdc3a958063c92f0d171d6a4c1e5ffd4059
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7bf044b422227fc97588219d3c2ed99f4e3258845df31a53d9948a0fa3e937f
[INFO] running `Command { std: "docker" "start" "-a" "b7bf044b422227fc97588219d3c2ed99f4e3258845df31a53d9948a0fa3e937f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.34
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling futures-channel v0.3.19
[INFO] [stderr]    Compiling futures-sink v0.3.19
[INFO] [stderr]    Compiling futures-util v0.3.19
[INFO] [stderr]    Compiling serde_derive v1.0.132
[INFO] [stderr]    Compiling futures-io v0.3.19
[INFO] [stderr]    Compiling serde v1.0.132
[INFO] [stderr]    Compiling httparse v1.5.1
[INFO] [stderr]    Compiling httpdate v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.73
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling tracing-core v0.1.21
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling rustls-pemfile v0.2.1
[INFO] [stderr]    Compiling http-body v0.4.4
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling rustls-native-certs v0.6.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.14
[INFO] [stderr]    Compiling socket2 v0.4.2
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling webpki v0.22.0
[INFO] [stderr]    Compiling sct v0.7.0
[INFO] [stderr]    Compiling rustls v0.20.2
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling futures-macro v0.3.19
[INFO] [stderr]    Compiling tracing-attributes v0.1.18
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling bigml_derive v0.4.0
[INFO] [stderr]    Compiling tokio v1.15.0
[INFO] [stderr]    Compiling pin-project v1.0.8
[INFO] [stderr]    Compiling tracing v0.1.29
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling futures-executor v0.3.19
[INFO] [stderr]    Compiling tokio-util v0.6.9
[INFO] [stderr]    Compiling tokio-rustls v0.23.2
[INFO] [stderr]    Compiling futures v0.3.19
[INFO] [stderr]    Compiling h2 v0.3.9
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling hyper v0.14.16
[INFO] [stderr]    Compiling hyper-rustls v0.23.0
[INFO] [stderr]    Compiling reqwest v0.11.7
[INFO] [stderr]    Compiling bigml v0.9.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.75s
[INFO] running `Command { std: "docker" "inspect" "b7bf044b422227fc97588219d3c2ed99f4e3258845df31a53d9948a0fa3e937f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7bf044b422227fc97588219d3c2ed99f4e3258845df31a53d9948a0fa3e937f", kill_on_drop: false }`
[INFO] [stdout] b7bf044b422227fc97588219d3c2ed99f4e3258845df31a53d9948a0fa3e937f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f363dc84799e2ae40f9df40cbafd1adc01e603ff96a9b5ad96d90268c6c9aec2
[INFO] running `Command { std: "docker" "start" "-a" "f363dc84799e2ae40f9df40cbafd1adc01e603ff96a9b5ad96d90268c6c9aec2", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.51
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling thread_local v1.1.3
[INFO] [stderr]    Compiling sharded-slab v0.1.4
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling tracing-log v0.1.2
[INFO] [stderr]    Compiling matchers v0.1.0
[INFO] [stderr]    Compiling tracing-subscriber v0.3.3
[INFO] [stderr]    Compiling bigml v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'backtrace'
[INFO] [stdout]    --> examples/create_execution.rs:113:31
[INFO] [stdout]     |
[INFO] [stdout] 113 |         eprintln!("{:?}", err.backtrace());
[INFO] [stdout]     |                               ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #53487 <https://github.com/rust-lang/rust/issues/53487> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bigml` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f363dc84799e2ae40f9df40cbafd1adc01e603ff96a9b5ad96d90268c6c9aec2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f363dc84799e2ae40f9df40cbafd1adc01e603ff96a9b5ad96d90268c6c9aec2", kill_on_drop: false }`
[INFO] [stdout] f363dc84799e2ae40f9df40cbafd1adc01e603ff96a9b5ad96d90268c6c9aec2