[INFO] fetching crate howtocards 0.1.3...
[INFO] documenting howtocards-0.1.3 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate howtocards 0.1.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate howtocards 0.1.3 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 howtocards 0.1.3
[INFO] finished tweaking crates.io crate howtocards 0.1.3
[INFO] tweaked toml for crates.io crate howtocards 0.1.3 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6b1d5dac20d3aafa468e0f89bd62d442f2e063cde0c70df2be7503958fc71264
[INFO] running `Command { std: "docker" "start" "-a" "6b1d5dac20d3aafa468e0f89bd62d442f2e063cde0c70df2be7503958fc71264", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b1d5dac20d3aafa468e0f89bd62d442f2e063cde0c70df2be7503958fc71264", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b1d5dac20d3aafa468e0f89bd62d442f2e063cde0c70df2be7503958fc71264", kill_on_drop: false }`
[INFO] [stdout] 6b1d5dac20d3aafa468e0f89bd62d442f2e063cde0c70df2be7503958fc71264
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] eaa1efd7b79e5b0f271d667c474a26e1aeec30dccd5b90ad1317d7990e9c67fa
[INFO] running `Command { std: "docker" "start" "-a" "eaa1efd7b79e5b0f271d667c474a26e1aeec30dccd5b90ad1317d7990e9c67fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking instant v0.1.6
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking zeroize v1.1.0
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[INFO] [stderr]     Checking arrayref v0.3.6
[INFO] [stderr]     Checking lazycell v1.3.0
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[INFO] [stderr]     Checking tower-service v0.1.0
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling actix-web v0.7.19
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling libdbus-sys v0.2.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
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[INFO] [stderr]    Compiling nom v4.2.3
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[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling diesel_derives v1.4.1
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[INFO] [stderr]     Checking r2d2 v0.8.9
[INFO] [stderr]     Checking cookie v0.11.3
[INFO] [stderr]    Compiling v_escape_derive v0.5.6
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking parking_lot v0.7.1
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[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking serde_urlencoded v0.5.5
[INFO] [stderr]     Checking ron v0.2.2
[INFO] [stderr]    Compiling actix_derive v0.3.2
[INFO] [stderr]     Checking actix v0.7.9
[INFO] [stderr]     Checking actix-net v0.2.6
[INFO] [stderr]     Checking howtocards v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting howtocards v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/db/token.rs:37:21
[INFO] [stdout]    |
[INFO] [stdout] 37 |                 let mut tokens = self.by_user_id.get_mut(user_id).unwrap();
[INFO] [stdout]    |                     ----^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 53s
[INFO] running `Command { std: "docker" "inspect" "eaa1efd7b79e5b0f271d667c474a26e1aeec30dccd5b90ad1317d7990e9c67fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eaa1efd7b79e5b0f271d667c474a26e1aeec30dccd5b90ad1317d7990e9c67fa", kill_on_drop: false }`
[INFO] [stdout] eaa1efd7b79e5b0f271d667c474a26e1aeec30dccd5b90ad1317d7990e9c67fa