[INFO] cloning repository https://github.com/upenn-cis198-2018f/lecture7
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/upenn-cis198-2018f/lecture7" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fupenn-cis198-2018f%2Flecture7", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fupenn-cis198-2018f%2Flecture7'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 80ae528176dbb3977613343c752420486c8dccd9
[INFO] checking upenn-cis198-2018f/lecture7 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fupenn-cis198-2018f%2Flecture7" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/upenn-cis198-2018f/lecture7 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/upenn-cis198-2018f/lecture7
[INFO] finished tweaking git repo https://github.com/upenn-cis198-2018f/lecture7
[INFO] tweaked toml for git repo https://github.com/upenn-cis198-2018f/lecture7 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/upenn-cis198-2018f/lecture7 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d8678786cb5c9d76be6363564b912a2862451b55e7c786bc56d409eb1f8516b
[INFO] running `Command { std: "docker" "start" "-a" "3d8678786cb5c9d76be6363564b912a2862451b55e7c786bc56d409eb1f8516b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d8678786cb5c9d76be6363564b912a2862451b55e7c786bc56d409eb1f8516b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d8678786cb5c9d76be6363564b912a2862451b55e7c786bc56d409eb1f8516b", kill_on_drop: false }`
[INFO] [stdout] 3d8678786cb5c9d76be6363564b912a2862451b55e7c786bc56d409eb1f8516b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a29a3ec61114441d7fd26804de97a104d2ada96841037ed2dc91fbee210ecd2d
[INFO] running `Command { std: "docker" "start" "-a" "a29a3ec61114441d7fd26804de97a104d2ada96841037ed2dc91fbee210ecd2d", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking lecture7 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/iterators.rs:243:21
[INFO] [stdout]     |
[INFO] [stdout] 243 | pub struct SongName(String);
[INFO] [stdout]     |            -------- ^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout]     = note: `SongName` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `disliked_songs`, `listens`, and `days_active` are never read
[INFO] [stdout]    --> src/iterators.rs:247:5
[INFO] [stdout]     |
[INFO] [stdout] 246 | pub struct SongUserProfile {
[INFO] [stdout]     |            --------------- fields in this struct
[INFO] [stdout] 247 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 248 |     liked_songs: Vec<SongName>,
[INFO] [stdout] 249 |     disliked_songs: Vec<SongName>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 250 |     listens: usize,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 251 |     days_active: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `SongUserProfile` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/iterators.rs:243:21
[INFO] [stdout]     |
[INFO] [stdout] 243 | pub struct SongName(String);
[INFO] [stdout]     |            -------- ^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout]     = note: `SongName` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `disliked_songs`, `listens`, and `days_active` are never read
[INFO] [stdout]    --> src/iterators.rs:247:5
[INFO] [stdout]     |
[INFO] [stdout] 246 | pub struct SongUserProfile {
[INFO] [stdout]     |            --------------- fields in this struct
[INFO] [stdout] 247 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 248 |     liked_songs: Vec<SongName>,
[INFO] [stdout] 249 |     disliked_songs: Vec<SongName>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 250 |     listens: usize,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 251 |     days_active: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `SongUserProfile` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "a29a3ec61114441d7fd26804de97a104d2ada96841037ed2dc91fbee210ecd2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a29a3ec61114441d7fd26804de97a104d2ada96841037ed2dc91fbee210ecd2d", kill_on_drop: false }`
[INFO] [stdout] a29a3ec61114441d7fd26804de97a104d2ada96841037ed2dc91fbee210ecd2d