[INFO] cloning repository https://github.com/jsvana/knowcodeextra.com
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jsvana/knowcodeextra.com" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsvana%2Fknowcodeextra.com", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsvana%2Fknowcodeextra.com'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c9dda5bb86c2e307da9afc1bc1ebb777bdc830bf
[INFO] checking jsvana/knowcodeextra.com against try#3fada14ee01d755dc8076e611f11bf65b28ffd21 for pr-154971
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsvana%2Fknowcodeextra.com" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jsvana/knowcodeextra.com
[INFO] finished tweaking git repo https://github.com/jsvana/knowcodeextra.com
[INFO] tweaked toml for git repo https://github.com/jsvana/knowcodeextra.com written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jsvana/knowcodeextra.com on toolchain 3fada14ee01d755dc8076e611f11bf65b28ffd21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3fada14ee01d755dc8076e611f11bf65b28ffd21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jsvana/knowcodeextra.com 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" "+3fada14ee01d755dc8076e611f11bf65b28ffd21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[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-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+3fada14ee01d755dc8076e611f11bf65b28ffd21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e04764b9591b50a245bbaa0586dcc7d2672cab0290b44a3c6def7be33123931b
[INFO] running `Command { std: "docker" "start" "-a" "e04764b9591b50a245bbaa0586dcc7d2672cab0290b44a3c6def7be33123931b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e04764b9591b50a245bbaa0586dcc7d2672cab0290b44a3c6def7be33123931b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e04764b9591b50a245bbaa0586dcc7d2672cab0290b44a3c6def7be33123931b", kill_on_drop: false }`
[INFO] [stdout] e04764b9591b50a245bbaa0586dcc7d2672cab0290b44a3c6def7be33123931b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+3fada14ee01d755dc8076e611f11bf65b28ffd21" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "2383a97e05877e5bc012eb2fb47625ac59eee078dba39ebc0ebd9bc21c910492", kill_on_drop: false }`
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[INFO] [stdout] warning: fields `question_id`, `user_answer`, and `correct_answer` are never read
[INFO] [stdout]   --> src/grading.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct QuestionResult {
[INFO] [stdout]    |            -------------- fields in this struct
[INFO] [stdout] 18 |     pub question_id: String,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 19 |     pub correct: bool,
[INFO] [stdout] 20 |     pub user_answer: Option<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 21 |     pub correct_answer: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuestionResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `question_id`, `correct`, `user_answer`, and `correct_answer` are never read
[INFO] [stdout]   --> src/grading.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct QuestionResult {
[INFO] [stdout]    |            -------------- fields in this struct
[INFO] [stdout] 18 |     pub question_id: String,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 19 |     pub correct: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 20 |     pub user_answer: Option<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 21 |     pub correct_answer: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `QuestionResult` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 54s
[INFO] running `Command { std: "docker" "inspect" "2383a97e05877e5bc012eb2fb47625ac59eee078dba39ebc0ebd9bc21c910492", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2383a97e05877e5bc012eb2fb47625ac59eee078dba39ebc0ebd9bc21c910492", kill_on_drop: false }`
[INFO] [stdout] 2383a97e05877e5bc012eb2fb47625ac59eee078dba39ebc0ebd9bc21c910492
