[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 master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction" "/workspace/builds/worker-46/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-46/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kalinsky/rust_introduction on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-46/source/Cargo.toml
[INFO] crate git repo https://github.com/kalinsky/rust_introduction already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92d2ab3427abd379078591d1ce2ad3637303339bfd34f1ca5de443291efb6d96
[INFO] running `Command { std: "docker" "start" "-a" "92d2ab3427abd379078591d1ce2ad3637303339bfd34f1ca5de443291efb6d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92d2ab3427abd379078591d1ce2ad3637303339bfd34f1ca5de443291efb6d96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92d2ab3427abd379078591d1ce2ad3637303339bfd34f1ca5de443291efb6d96", kill_on_drop: false }`
[INFO] [stdout] 92d2ab3427abd379078591d1ce2ad3637303339bfd34f1ca5de443291efb6d96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-46/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 67cb39a07816f8ef56cf5d0fb96b3af7378d2c473c87c0e26a5578cb837c749a
[INFO] running `Command { std: "docker" "start" "-a" "67cb39a07816f8ef56cf5d0fb96b3af7378d2c473c87c0e26a5578cb837c749a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]  --> src/structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]  --> src/structs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     active: bool
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `user`
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     user: User,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `has_powers`
[INFO] [stdout]   --> src/structs.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     has_powers: bool
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]  --> src/structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]  --> src/structs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     active: bool
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `user`
[INFO] [stdout]   --> src/structs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     user: User,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `has_powers`
[INFO] [stdout]   --> src/structs.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     has_powers: bool
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `Command { std: "docker" "inspect" "67cb39a07816f8ef56cf5d0fb96b3af7378d2c473c87c0e26a5578cb837c749a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67cb39a07816f8ef56cf5d0fb96b3af7378d2c473c87c0e26a5578cb837c749a", kill_on_drop: false }`
[INFO] [stdout] 67cb39a07816f8ef56cf5d0fb96b3af7378d2c473c87c0e26a5578cb837c749a