[INFO] updating cached repository https://github.com/wbigger/RustIntro
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7e1c039a0b5396dc86b1435860f521e4065dea32
[INFO] checking wbigger/RustIntro against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwbigger%2FRustIntro" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wbigger/RustIntro on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/wbigger/RustIntro
[INFO] finished tweaking git repo https://github.com/wbigger/RustIntro
[INFO] tweaked toml for git repo https://github.com/wbigger/RustIntro written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/wbigger/RustIntro already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c41c08c9bce5f0b7ae3bbcb6aa0081573b0144e1f6346e0595c10606a63b403a
[INFO] running `"docker" "start" "-a" "c41c08c9bce5f0b7ae3bbcb6aa0081573b0144e1f6346e0595c10606a63b403a"`
[INFO] [stderr]     Checking RustIntro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `vec`
[INFO] [stderr]  --> src/ownership.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn take(vec: Vec<i32>) {
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_vec`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]  --> src/lifetime.rs:5:10
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let (s1,s2) = line.split_at(prefix.len());
[INFO] [stderr]   |          ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vec`
[INFO] [stderr]  --> src/ownership.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn take(vec: Vec<i32>) {
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_vec`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vec`
[INFO] [stderr]  --> src/borrowing.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn user(vec: &Vec<i32>) {
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_vec`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vec`
[INFO] [stderr]  --> src/borrowing.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn user(vec: &Vec<i32>) {
[INFO] [stderr]   |         ^^^ help: consider prefixing with an underscore: `_vec`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]  --> src/lifetime.rs:5:10
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let (s1,s2) = line.split_at(prefix.len());
[INFO] [stderr]   |          ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `"docker" "inspect" "c41c08c9bce5f0b7ae3bbcb6aa0081573b0144e1f6346e0595c10606a63b403a"`
[INFO] running `"docker" "rm" "-f" "c41c08c9bce5f0b7ae3bbcb6aa0081573b0144e1f6346e0595c10606a63b403a"`
[INFO] [stdout] c41c08c9bce5f0b7ae3bbcb6aa0081573b0144e1f6346e0595c10606a63b403a