[INFO] fetching crate howtocards_backend 0.1.2...
[INFO] documenting howtocards_backend-0.1.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate howtocards_backend 0.1.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate howtocards_backend 0.1.2 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 crates.io crate howtocards_backend 0.1.2
[INFO] finished tweaking crates.io crate howtocards_backend 0.1.2
[INFO] tweaked toml for crates.io crate howtocards_backend 0.1.2 written to /workspace/builds/worker-2/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stdout] cb0b1cdaa23afc2c1ff7417d6fd2d26d7e7e9375faecd93cfa51d21f714ed206
[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" "cb0b1cdaa23afc2c1ff7417d6fd2d26d7e7e9375faecd93cfa51d21f714ed206", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb0b1cdaa23afc2c1ff7417d6fd2d26d7e7e9375faecd93cfa51d21f714ed206", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb0b1cdaa23afc2c1ff7417d6fd2d26d7e7e9375faecd93cfa51d21f714ed206", kill_on_drop: false }`
[INFO] [stdout] cb0b1cdaa23afc2c1ff7417d6fd2d26d7e7e9375faecd93cfa51d21f714ed206
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 5e2315ef732471179cd9e37e410a6dd6430ad69c7052cfd446f18044920414c5
[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" "5e2315ef732471179cd9e37e410a6dd6430ad69c7052cfd446f18044920414c5", kill_on_drop: false }`
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[INFO] [stderr]  Documenting howtocards_backend v0.1.2 (/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 2m 17s
[INFO] running `Command { std: "docker" "inspect" "5e2315ef732471179cd9e37e410a6dd6430ad69c7052cfd446f18044920414c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e2315ef732471179cd9e37e410a6dd6430ad69c7052cfd446f18044920414c5", kill_on_drop: false }`
[INFO] [stdout] 5e2315ef732471179cd9e37e410a6dd6430ad69c7052cfd446f18044920414c5