[INFO] updating cached repository wbigger/RustIntro
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wbigger/RustIntro
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wbigger/RustIntro" "work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/wbigger/RustIntro"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/wbigger/RustIntro'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wbigger/RustIntro" "work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/wbigger/RustIntro"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/wbigger/RustIntro'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7e1c039a0b5396dc86b1435860f521e4065dea32
[INFO] sha for GitHub repo wbigger/RustIntro: 7e1c039a0b5396dc86b1435860f521e4065dea32
[INFO] validating manifest of wbigger/RustIntro on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of wbigger/RustIntro on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing wbigger/RustIntro
[INFO] finished frobbing wbigger/RustIntro
[INFO] frobbed toml for wbigger/RustIntro written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/wbigger/RustIntro/Cargo.toml
[INFO] started frobbing wbigger/RustIntro
[INFO] finished frobbing wbigger/RustIntro
[INFO] frobbed toml for wbigger/RustIntro written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/wbigger/RustIntro/Cargo.toml
[INFO] crate wbigger/RustIntro already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking wbigger/RustIntro against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-7/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/wbigger/RustIntro:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8d6f753e8509fba47ebad94c9f04155da84b09955eff3e8b357b647c7fead47d
[INFO] running `"docker" "start" "-a" "8d6f753e8509fba47ebad94c9f04155da84b09955eff3e8b357b647c7fead47d"`
[INFO] [stderr]     Checking RustIntro v0.1.0 (/opt/crater/workdir)
[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/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] 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] 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]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[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] 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]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `"docker" "inspect" "8d6f753e8509fba47ebad94c9f04155da84b09955eff3e8b357b647c7fead47d"`
[INFO] running `"docker" "rm" "-f" "8d6f753e8509fba47ebad94c9f04155da84b09955eff3e8b357b647c7fead47d"`
[INFO] [stdout] 8d6f753e8509fba47ebad94c9f04155da84b09955eff3e8b357b647c7fead47d