[INFO] fetching crate metrics-exporter-prometheus 0.1.0-alpha.3...
[INFO] documenting metrics-exporter-prometheus-0.1.0-alpha.3 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate metrics-exporter-prometheus 0.1.0-alpha.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate metrics-exporter-prometheus 0.1.0-alpha.3 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate metrics-exporter-prometheus 0.1.0-alpha.3
[INFO] finished tweaking crates.io crate metrics-exporter-prometheus 0.1.0-alpha.3
[INFO] tweaked toml for crates.io crate metrics-exporter-prometheus 0.1.0-alpha.3 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate metrics-exporter-prometheus 0.1.0-alpha.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6eda17def61d3e151fed5f20b8382dc59927af1c698100c7805745e95b240724
[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" "6eda17def61d3e151fed5f20b8382dc59927af1c698100c7805745e95b240724", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6eda17def61d3e151fed5f20b8382dc59927af1c698100c7805745e95b240724", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6eda17def61d3e151fed5f20b8382dc59927af1c698100c7805745e95b240724", kill_on_drop: false }`
[INFO] [stdout] 6eda17def61d3e151fed5f20b8382dc59927af1c698100c7805745e95b240724
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc4b1e7f3a108bb663e08820a61b0b5a1b58bdea0be4fbeb1b1a2939fc45e4c1
[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" "fc4b1e7f3a108bb663e08820a61b0b5a1b58bdea0be4fbeb1b1a2939fc45e4c1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.35
[INFO] [stderr]    Compiling metrics v0.13.0-alpha.1
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling hashbrown v0.8.1
[INFO] [stderr]    Compiling indexmap v1.5.0
[INFO] [stderr]     Checking tracing-core v0.1.11
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling im v14.3.0
[INFO] [stderr]     Checking rand_xoshiro v0.4.0
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking bitmaps v2.1.0
[INFO] [stderr]     Checking flate2 v1.0.16
[INFO] [stderr]     Checking crossbeam-channel v0.4.3
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking hdrhistogram v7.1.0
[INFO] [stderr]     Checking sized-chunks v0.5.3
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling rustversion v1.0.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.9
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]    Compiling metrics-macros v0.1.0-alpha.2
[INFO] [stderr]     Checking tracing v0.1.16
[INFO] [stderr]     Checking metrics-util v0.4.0-alpha.1
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]  Documenting metrics-exporter-prometheus v0.1.0-alpha.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 02s
[INFO] running `Command { std: "docker" "inspect" "fc4b1e7f3a108bb663e08820a61b0b5a1b58bdea0be4fbeb1b1a2939fc45e4c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc4b1e7f3a108bb663e08820a61b0b5a1b58bdea0be4fbeb1b1a2939fc45e4c1", kill_on_drop: false }`
[INFO] [stdout] fc4b1e7f3a108bb663e08820a61b0b5a1b58bdea0be4fbeb1b1a2939fc45e4c1