[INFO] cloning repository llogiq/optional
[INFO] running `"git" "clone" "--bare" "git://github.com/llogiq/optional.git" "work/cache/sources/gh/llogiq/optional"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/llogiq/optional'...
[INFO] running `"git" "clone" "work/cache/sources/gh/llogiq/optional" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/llogiq/optional"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/llogiq/optional'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/llogiq/optional" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/llogiq/optional"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/llogiq/optional'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8d4db09681cdda5484fe714c38332b2f25415254
[INFO] sha for GitHub repo llogiq/optional: 8d4db09681cdda5484fe714c38332b2f25415254
[INFO] validating manifest of llogiq/optional 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 llogiq/optional 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 llogiq/optional
[INFO] finished frobbing llogiq/optional
[INFO] frobbed toml for llogiq/optional written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/llogiq/optional/Cargo.toml
[INFO] started frobbing llogiq/optional
[INFO] finished frobbing llogiq/optional
[INFO] frobbed toml for llogiq/optional written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/llogiq/optional/Cargo.toml
[INFO] crate llogiq/optional 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 llogiq/optional against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-1/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/llogiq/optional:/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] c6bf9bf6a057151536bd4b3716d7a2f14df34ac246ee41e6e42cca3cb42636b8
[INFO] running `"docker" "start" "-a" "c6bf9bf6a057151536bd4b3716d7a2f14df34ac246ee41e6e42cca3cb42636b8"`
[INFO] [stderr]     Checking optional v0.5.0 (/opt/crater/workdir)
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.96s
[INFO] running `"docker" "inspect" "c6bf9bf6a057151536bd4b3716d7a2f14df34ac246ee41e6e42cca3cb42636b8"`
[INFO] running `"docker" "rm" "-f" "c6bf9bf6a057151536bd4b3716d7a2f14df34ac246ee41e6e42cca3cb42636b8"`
[INFO] [stdout] c6bf9bf6a057151536bd4b3716d7a2f14df34ac246ee41e6e42cca3cb42636b8