[INFO] cloning repository https://github.com/jacderida/books-db
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jacderida/books-db" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacderida%2Fbooks-db", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacderida%2Fbooks-db'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b2398e679b00cc8b8097e9838042cab17262f771
[INFO] checking jacderida/books-db against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacderida%2Fbooks-db" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jacderida/books-db
[INFO] finished tweaking git repo https://github.com/jacderida/books-db
[INFO] tweaked toml for git repo https://github.com/jacderida/books-db written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jacderida/books-db on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jacderida/books-db already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbd382e0812f925bf3f6e67a1eebd24089af7a242798fb4ec8e62bcfcdf8d0ee
[INFO] running `Command { std: "docker" "start" "-a" "cbd382e0812f925bf3f6e67a1eebd24089af7a242798fb4ec8e62bcfcdf8d0ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbd382e0812f925bf3f6e67a1eebd24089af7a242798fb4ec8e62bcfcdf8d0ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbd382e0812f925bf3f6e67a1eebd24089af7a242798fb4ec8e62bcfcdf8d0ee", kill_on_drop: false }`
[INFO] [stdout] cbd382e0812f925bf3f6e67a1eebd24089af7a242798fb4ec8e62bcfcdf8d0ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa8531d0c71ad58cbaf9e531d598386c59b52d304f780c60dad71168f5e2acfb
[INFO] running `Command { std: "docker" "start" "-a" "fa8531d0c71ad58cbaf9e531d598386c59b52d304f780c60dad71168f5e2acfb", kill_on_drop: false }`
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[INFO] [stderr]     Checking books-db v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/books.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         for mut author in book.authors.iter_mut() {
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `image_url` is never read
[INFO] [stdout]   --> src/isbn_db.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout]  7 | pub struct IsbnDbBook {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 10 |     pub image_url: String,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/books.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         for mut author in book.authors.iter_mut() {
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 07s
[INFO] running `Command { std: "docker" "inspect" "fa8531d0c71ad58cbaf9e531d598386c59b52d304f780c60dad71168f5e2acfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa8531d0c71ad58cbaf9e531d598386c59b52d304f780c60dad71168f5e2acfb", kill_on_drop: false }`
[INFO] [stdout] fa8531d0c71ad58cbaf9e531d598386c59b52d304f780c60dad71168f5e2acfb
