[INFO] cloning repository https://github.com/kalinsky/rust_introduction
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kalinsky/rust_introduction" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef8bcce5dfb02a792018dbabd77ac0fc05b51191
[INFO] checking kalinsky/rust_introduction against try#f27166d4c64dc29edc5ea3214357f191edf8b635 for pr-148329
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kalinsky/rust_introduction
[INFO] finished tweaking git repo https://github.com/kalinsky/rust_introduction
[INFO] tweaked toml for git repo https://github.com/kalinsky/rust_introduction written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kalinsky/rust_introduction on toolchain f27166d4c64dc29edc5ea3214357f191edf8b635
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f27166d4c64dc29edc5ea3214357f191edf8b635" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kalinsky/rust_introduction 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" "+f27166d4c64dc29edc5ea3214357f191edf8b635" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+f27166d4c64dc29edc5ea3214357f191edf8b635" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0a27d447aec8544efba160ba149c4bbb525316e4caa53b59dbe59780ee3788e
[INFO] running `Command { std: "docker" "start" "-a" "a0a27d447aec8544efba160ba149c4bbb525316e4caa53b59dbe59780ee3788e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0a27d447aec8544efba160ba149c4bbb525316e4caa53b59dbe59780ee3788e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0a27d447aec8544efba160ba149c4bbb525316e4caa53b59dbe59780ee3788e", kill_on_drop: false }`
[INFO] [stdout] a0a27d447aec8544efba160ba149c4bbb525316e4caa53b59dbe59780ee3788e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+f27166d4c64dc29edc5ea3214357f191edf8b635" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dc38243f620a96d29fa592cf82c7ffdeb243073b4440121a69880c1ffff9a5d
[INFO] running `Command { std: "docker" "start" "-a" "6dc38243f620a96d29fa592cf82c7ffdeb243073b4440121a69880c1ffff9a5d", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_introduction v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `admin_user`
[INFO] [stdout]   --> src/structs.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let admin_user = build_power_user(
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_admin_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `admin_user`
[INFO] [stdout]   --> src/structs.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let admin_user = build_power_user(
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_admin_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `email`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is 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 `user` and `has_powers` are never read
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct AdminUser {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 11 |     user: User,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 12 |     has_powers: bool
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AdminUser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `email`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Debug`, but this is 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 `user` and `has_powers` are never read
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct AdminUser {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 11 |     user: User,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 12 |     has_powers: bool
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `AdminUser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "6dc38243f620a96d29fa592cf82c7ffdeb243073b4440121a69880c1ffff9a5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dc38243f620a96d29fa592cf82c7ffdeb243073b4440121a69880c1ffff9a5d", kill_on_drop: false }`
[INFO] [stdout] 6dc38243f620a96d29fa592cf82c7ffdeb243073b4440121a69880c1ffff9a5d