[INFO] cloning repository massih/rust_book
[INFO] running `"git" "clone" "--bare" "git://github.com/massih/rust_book.git" "work/cache/sources/gh/massih/rust_book"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/massih/rust_book'...
[INFO] running `"git" "clone" "work/cache/sources/gh/massih/rust_book" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/massih/rust_book"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/massih/rust_book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/massih/rust_book" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/massih/rust_book"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/massih/rust_book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d158ebbce8c69207e137df888b413f4e8c385595
[INFO] sha for GitHub repo massih/rust_book: d158ebbce8c69207e137df888b413f4e8c385595
[INFO] validating manifest of massih/rust_book on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of massih/rust_book on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing massih/rust_book
[INFO] finished frobbing massih/rust_book
[INFO] frobbed toml for massih/rust_book written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/massih/rust_book/Cargo.toml
[INFO] started frobbing massih/rust_book
[INFO] finished frobbing massih/rust_book
[INFO] frobbed toml for massih/rust_book written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/massih/rust_book/Cargo.toml
[INFO] crate massih/rust_book already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking massih/rust_book against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-6/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/massih/rust_book:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9dcec8a3419a0b8b6db2515e35cd4c91c44253eca3ed01b6d6bb7584d88b828b
[INFO] running `"docker" "start" "-a" "9dcec8a3419a0b8b6db2515e35cd4c91c44253eca3ed01b6d6bb7584d88b828b"`
[INFO] [stderr]     Checking rand v0.4.5
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking rust1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.12s
[INFO] running `"docker" "inspect" "9dcec8a3419a0b8b6db2515e35cd4c91c44253eca3ed01b6d6bb7584d88b828b"`
[INFO] running `"docker" "rm" "-f" "9dcec8a3419a0b8b6db2515e35cd4c91c44253eca3ed01b6d6bb7584d88b828b"`
[INFO] [stdout] 9dcec8a3419a0b8b6db2515e35cd4c91c44253eca3ed01b6d6bb7584d88b828b