[INFO] updating cached repository robbystk/rust-by-the-book
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/robbystk/rust-by-the-book
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/robbystk/rust-by-the-book" "work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/robbystk/rust-by-the-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/robbystk/rust-by-the-book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/robbystk/rust-by-the-book" "work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/robbystk/rust-by-the-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/robbystk/rust-by-the-book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b2120be5dc3c77b3f9df768ed82cad8b55111ffb
[INFO] sha for GitHub repo robbystk/rust-by-the-book: b2120be5dc3c77b3f9df768ed82cad8b55111ffb
[INFO] validating manifest of robbystk/rust-by-the-book on toolchain master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of robbystk/rust-by-the-book on toolchain try#bad365140e1e8233b42b21af70a407f14ce5fec5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing robbystk/rust-by-the-book
[INFO] finished frobbing robbystk/rust-by-the-book
[INFO] frobbed toml for robbystk/rust-by-the-book written to work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/robbystk/rust-by-the-book/Cargo.toml
[INFO] started frobbing robbystk/rust-by-the-book
[INFO] finished frobbing robbystk/rust-by-the-book
[INFO] frobbed toml for robbystk/rust-by-the-book written to work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/robbystk/rust-by-the-book/Cargo.toml
[INFO] crate robbystk/rust-by-the-book has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking robbystk/rust-by-the-book against try#bad365140e1e8233b42b21af70a407f14ce5fec5 for pr-56896
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56896/worker-5/try#bad365140e1e8233b42b21af70a407f14ce5fec5:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/robbystk/rust-by-the-book:/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" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d4b99d9cffd969845750ba84db7c942e3e4dc4498f7dc7ec8d36e512d90d4ab2
[INFO] running `"docker" "start" "-a" "d4b99d9cffd969845750ba84db7c942e3e4dc4498f7dc7ec8d36e512d90d4ab2"`
[INFO] [stderr]     Checking errors v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
[INFO] [stderr]   |         ^ help: consider using `_f` instead
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
[INFO] [stderr]   |         ^ help: consider using `_f` instead
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `"docker" "inspect" "d4b99d9cffd969845750ba84db7c942e3e4dc4498f7dc7ec8d36e512d90d4ab2"`
[INFO] running `"docker" "rm" "-f" "d4b99d9cffd969845750ba84db7c942e3e4dc4498f7dc7ec8d36e512d90d4ab2"`
[INFO] [stdout] d4b99d9cffd969845750ba84db7c942e3e4dc4498f7dc7ec8d36e512d90d4ab2