[INFO] updating cached repository droundy/rust-student-pairs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/droundy/rust-student-pairs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/droundy/rust-student-pairs" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/droundy/rust-student-pairs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/droundy/rust-student-pairs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/droundy/rust-student-pairs" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/droundy/rust-student-pairs"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/droundy/rust-student-pairs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 71c5acdacdf8b51fede27b131248c0af9a89bbea
[INFO] sha for GitHub repo droundy/rust-student-pairs: 71c5acdacdf8b51fede27b131248c0af9a89bbea
[INFO] validating manifest of droundy/rust-student-pairs on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of droundy/rust-student-pairs on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing droundy/rust-student-pairs
[INFO] finished frobbing droundy/rust-student-pairs
[INFO] frobbed toml for droundy/rust-student-pairs written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/droundy/rust-student-pairs/Cargo.toml
[INFO] started frobbing droundy/rust-student-pairs
[INFO] finished frobbing droundy/rust-student-pairs
[INFO] frobbed toml for droundy/rust-student-pairs written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/droundy/rust-student-pairs/Cargo.toml
[INFO] crate droundy/rust-student-pairs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking droundy/rust-student-pairs against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-3/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/droundy/rust-student-pairs:/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" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 3e50a795ff4ca521503be357a231a9baa2208bf68489fdffa162bcc48c0f4874
[INFO] running `"docker" "start" "-a" "3e50a795ff4ca521503be357a231a9baa2208bf68489fdffa162bcc48c0f4874"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.15
[INFO] [stderr]    Compiling serde v1.0.75
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking chunked_transfer v0.3.1
[INFO] [stderr]    Compiling memchr v2.0.2
[INFO] [stderr]    Compiling brotli-sys v0.2.1
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking filetime v0.1.15
[INFO] [stderr]     Checking base64 v0.7.0
[INFO] [stderr]     Checking yaml-rust v0.4.0
[INFO] [stderr]     Checking tinyset v0.2.2
[INFO] [stderr]     Checking buf_redux v0.6.3
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]     Checking twoway v0.1.8
[INFO] [stderr]    Compiling nom v4.0.0
[INFO] [stderr]     Checking uuid v0.1.18
[INFO] [stderr]    Compiling phf_shared v0.7.23
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking term v0.2.14
[INFO] [stderr]     Checking state v0.4.1
[INFO] [stderr]     Checking url v0.2.38
[INFO] [stderr]     Checking phf v0.7.23
[INFO] [stderr]    Compiling phf_generator v0.7.23
[INFO] [stderr]     Checking gzip-header v0.1.2
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]    Compiling phf_codegen v0.7.23
[INFO] [stderr]     Checking deflate v0.7.18
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]    Compiling mime_guess v1.8.6
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking tiny_http v0.5.9
[INFO] [stderr]     Checking brotli2 v0.2.2
[INFO] [stderr]     Checking multipart v0.13.6
[INFO] [stderr]    Compiling serde_derive v1.0.75
[INFO] [stderr]     Checking toml v0.4.6
[INFO] [stderr]     Checking serde_json v1.0.26
[INFO] [stderr]     Checking internment v0.3.6
[INFO] [stderr]     Checking serde_yaml v0.7.5
[INFO] [stderr]    Compiling askama_shared v0.7.1
[INFO] [stderr]     Checking rouille v2.1.0
[INFO] [stderr]    Compiling askama_derive v0.7.1
[INFO] [stderr]    Compiling askama v0.7.1
[INFO] [stderr]    Compiling rust-student-pairs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 39s
[INFO] running `"docker" "inspect" "3e50a795ff4ca521503be357a231a9baa2208bf68489fdffa162bcc48c0f4874"`
[INFO] running `"docker" "rm" "-f" "3e50a795ff4ca521503be357a231a9baa2208bf68489fdffa162bcc48c0f4874"`
[INFO] [stdout] 3e50a795ff4ca521503be357a231a9baa2208bf68489fdffa162bcc48c0f4874