[INFO] cloning repository https://github.com/hatoo/cargo-snippet
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hatoo/cargo-snippet" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fcargo-snippet", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fcargo-snippet'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ddf4b9c1fe949e014d70f31aab21362f8cbadaaf
[INFO] documenting hatoo/cargo-snippet against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhatoo%2Fcargo-snippet" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hatoo/cargo-snippet on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hatoo/cargo-snippet
[INFO] finished tweaking git repo https://github.com/hatoo/cargo-snippet
[INFO] tweaked toml for git repo https://github.com/hatoo/cargo-snippet written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded indexmap v1.5.2
[INFO] [stderr]   Downloaded either v1.6.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.20
[INFO] [stderr]   Downloaded unicode_categories v0.1.1
[INFO] [stderr]   Downloaded rustfmt-config_proc_macro v0.2.0
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[INFO] [stderr]   Downloaded anyhow v1.0.32
[INFO] [stderr]   Downloaded itertools v0.8.2
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[INFO] [stderr]   Downloaded rustc-ap-rustc_lexer v669.0.0
[INFO] [stderr]   Downloaded annotate-snippets v0.8.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_feature v669.0.0
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[INFO] [stderr]   Downloaded ena v0.14.0
[INFO] [stderr]   Downloaded annotate-snippets v0.6.1
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[INFO] [stderr]   Downloaded rustc-ap-rustc_attr v669.0.0
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[INFO] [stderr]   Downloaded rustc-ap-rustc_parse v669.0.0
[INFO] [stderr]   Downloaded globset v0.4.5
[INFO] [stderr]   Downloaded proc-macro-error-attr v1.0.4
[INFO] [stderr]   Downloaded rustc-ap-rustc_errors v669.0.0
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[INFO] [stderr]   Downloaded bstr v0.2.13
[INFO] [stderr]   Downloaded rustc-ap-rustc_target v669.0.0
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[INFO] [stderr]   Downloaded derive-new v0.5.8
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[INFO] [stderr]   Downloaded rustc-ap-rustc_graphviz v669.0.0
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[INFO] [stderr]   Downloaded redox_syscall v0.1.57
[INFO] [stderr]   Downloaded instant v0.1.6
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[INFO] [stderr]   Downloaded rustc-ap-rustc_session v669.0.0
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[INFO] [stderr]   Downloaded parking_lot_core v0.8.0
[INFO] [stderr]   Downloaded structopt v0.3.17
[INFO] [stderr]   Downloaded syn v1.0.39
[INFO] [stderr]   Downloaded rustc-ap-rustc_ast_passes v669.0.0
[INFO] [stderr]   Downloaded term v0.6.1
[INFO] [stderr]   Downloaded autocfg v1.0.1
[INFO] [stderr]   Downloaded rustc-rayon-core v0.3.0
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[INFO] [stderr]   Downloaded rustc-ap-rustc_ast v669.0.0
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[INFO] [stderr]   Downloaded rustc-ap-rustc_ast_pretty v669.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_fs_util v669.0.0
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[INFO] [stderr]   Downloaded aho-corasick v0.7.13
[INFO] [stderr]   Downloaded regex-syntax v0.6.18
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.3
[INFO] [stderr]   Downloaded toml v0.5.6
[INFO] [stderr]   Downloaded proc-macro-error v1.0.4
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[INFO] [stderr]   Downloaded cargo_metadata v0.8.2
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[INFO] [stderr]   Downloaded rustc-ap-rustc_macros v669.0.0
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[INFO] [stderr]   Downloaded parking_lot v0.11.0
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[INFO] [stderr]   Downloaded quote v1.0.7
[INFO] [stderr]   Downloaded unicode-segmentation v1.6.0
[INFO] [stderr]   Downloaded smallvec v0.6.13
[INFO] [stderr]   Downloaded measureme v0.7.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_span v669.0.0
[INFO] [stderr]   Downloaded once_cell v1.4.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_serialize v669.0.0
[INFO] [stderr]   Downloaded memoffset v0.5.5
[INFO] [stderr]   Downloaded crossbeam-utils v0.6.6
[INFO] [stderr]   Downloaded structopt-derive v0.4.10
[INFO] [stderr]   Downloaded redox_users v0.3.5
[INFO] [stderr]   Downloaded psm v0.1.11
[INFO] [stderr]   Downloaded base64 v0.12.3
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[INFO] [stderr]   Downloaded smallvec v1.4.2
[INFO] [stderr]   Downloaded scoped-tls v1.0.0
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[INFO] [stderr]   Downloaded thiserror-impl v1.0.20
[INFO] [stderr]   Downloaded thiserror v1.0.20
[INFO] [stderr]   Downloaded serde_derive v1.0.115
[INFO] [stderr]   Downloaded memmap v0.7.0
[INFO] [stderr]   Downloaded parking_lot v0.9.0
[INFO] [stderr]   Downloaded parking_lot_core v0.6.2
[INFO] [stderr]   Downloaded crossbeam-epoch v0.8.2
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[INFO] [stderr]   Downloaded fnv v1.0.7
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fc61649caf1d1353d1c0167fda8b53cd353b82cad196ee7ad3b00ea69020d607
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fc61649caf1d1353d1c0167fda8b53cd353b82cad196ee7ad3b00ea69020d607", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc61649caf1d1353d1c0167fda8b53cd353b82cad196ee7ad3b00ea69020d607", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc61649caf1d1353d1c0167fda8b53cd353b82cad196ee7ad3b00ea69020d607", kill_on_drop: false }`
[INFO] [stdout] fc61649caf1d1353d1c0167fda8b53cd353b82cad196ee7ad3b00ea69020d607
[INFO] running `Command { std: "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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36914feb7be76d3cf14ab9cecdafd7be6b294e9b5b7214fe9678815ad6fe9bf7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "36914feb7be76d3cf14ab9cecdafd7be6b294e9b5b7214fe9678815ad6fe9bf7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Documenting cargo-snippet v0.6.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.33s
[INFO] running `Command { std: "docker" "inspect" "36914feb7be76d3cf14ab9cecdafd7be6b294e9b5b7214fe9678815ad6fe9bf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36914feb7be76d3cf14ab9cecdafd7be6b294e9b5b7214fe9678815ad6fe9bf7", kill_on_drop: false }`
[INFO] [stdout] 36914feb7be76d3cf14ab9cecdafd7be6b294e9b5b7214fe9678815ad6fe9bf7