[INFO] cloning repository https://github.com/jwmurray/code_in_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jwmurray/code_in_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwmurray%2Fcode_in_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwmurray%2Fcode_in_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 04151169e3aa17d00bb295fa5219d22555f1e190
[INFO] checking jwmurray/code_in_rust against master#ca77504943887037504c7fc0b9bf06dab3910373 for pr-145181
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjwmurray%2Fcode_in_rust" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jwmurray/code_in_rust
[INFO] finished tweaking git repo https://github.com/jwmurray/code_in_rust
[INFO] tweaked toml for git repo https://github.com/jwmurray/code_in_rust written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jwmurray/code_in_rust on toolchain ca77504943887037504c7fc0b9bf06dab3910373
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ca77504943887037504c7fc0b9bf06dab3910373" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jwmurray/code_in_rust 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" "+ca77504943887037504c7fc0b9bf06dab3910373" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:ae6f63d130afcfff7f91f5ba9fdb2a74d52830289c6a2ea2d23a94dcfb480a0d" "/opt/rustwide/cargo-home/bin/cargo" "+ca77504943887037504c7fc0b9bf06dab3910373" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7f9f8b4e31a5ddc929718f805a3f552b14256afde53811e9de814c670aafdb9c
[INFO] running `Command { std: "docker" "start" "-a" "7f9f8b4e31a5ddc929718f805a3f552b14256afde53811e9de814c670aafdb9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7f9f8b4e31a5ddc929718f805a3f552b14256afde53811e9de814c670aafdb9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f9f8b4e31a5ddc929718f805a3f552b14256afde53811e9de814c670aafdb9c", kill_on_drop: false }`
[INFO] [stdout] 7f9f8b4e31a5ddc929718f805a3f552b14256afde53811e9de814c670aafdb9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:ae6f63d130afcfff7f91f5ba9fdb2a74d52830289c6a2ea2d23a94dcfb480a0d" "/opt/rustwide/cargo-home/bin/cargo" "+ca77504943887037504c7fc0b9bf06dab3910373" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 131d368dcbb67e4fc320b409e1f85788f38a38dd93dffa5bb19e9d5f623ad06e
[INFO] running `Command { std: "docker" "start" "-a" "131d368dcbb67e4fc320b409e1f85788f38a38dd93dffa5bb19e9d5f623ad06e", kill_on_drop: false }`
[INFO] [stderr]     Checking option_t_demistified v0.1.0 (/opt/rustwide/workdir/Beginner/option_t_demistified)
[INFO] [stdout] warning: function `main2` is never used
[INFO] [stdout]   --> Beginner/option_t_demistified/src/main.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main3` is never used
[INFO] [stdout]   --> Beginner/option_t_demistified/src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn main3() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main2` is never used
[INFO] [stdout]   --> Beginner/option_t_demistified/src/main.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main3` is never used
[INFO] [stdout]   --> Beginner/option_t_demistified/src/main.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn main3() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "131d368dcbb67e4fc320b409e1f85788f38a38dd93dffa5bb19e9d5f623ad06e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "131d368dcbb67e4fc320b409e1f85788f38a38dd93dffa5bb19e9d5f623ad06e", kill_on_drop: false }`
[INFO] [stdout] 131d368dcbb67e4fc320b409e1f85788f38a38dd93dffa5bb19e9d5f623ad06e