[INFO] updating cached repository llwwns/pairing_heap
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/llwwns/pairing_heap
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/llwwns/pairing_heap" "work/ex/beta-1.37-6/sources/1.36.0/gh/llwwns/pairing_heap"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/llwwns/pairing_heap'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/llwwns/pairing_heap" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b8f1c8ff87c95c26a0d04a2ed75c5b818fb34881
[INFO] sha for GitHub repo llwwns/pairing_heap: b8f1c8ff87c95c26a0d04a2ed75c5b818fb34881
[INFO] validating manifest of llwwns/pairing_heap on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of llwwns/pairing_heap on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing llwwns/pairing_heap
[INFO] finished frobbing llwwns/pairing_heap
[INFO] frobbed toml for llwwns/pairing_heap written to work/ex/beta-1.37-6/sources/1.36.0/gh/llwwns/pairing_heap/Cargo.toml
[INFO] started frobbing llwwns/pairing_heap
[INFO] finished frobbing llwwns/pairing_heap
[INFO] frobbed toml for llwwns/pairing_heap written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap/Cargo.toml
[INFO] crate llwwns/pairing_heap already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing llwwns/pairing_heap against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap:/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=warn" "-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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] cd5bb78326b0739c49d631f555e85e3e59712a50cb5990f3a195ce7e88763876
[INFO] running `"docker" "start" "-a" "cd5bb78326b0739c49d631f555e85e3e59712a50cb5990f3a195ce7e88763876"`
[INFO] [stderr]    Compiling pairing_heap v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `"docker" "inspect" "cd5bb78326b0739c49d631f555e85e3e59712a50cb5990f3a195ce7e88763876"`
[INFO] running `"docker" "rm" "-f" "cd5bb78326b0739c49d631f555e85e3e59712a50cb5990f3a195ce7e88763876"`
[INFO] [stdout] cd5bb78326b0739c49d631f555e85e3e59712a50cb5990f3a195ce7e88763876
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 9fa7a5dd968688bf91ca892ac517ca4aad1676dba341c7fcfcd039228717de82
[INFO] running `"docker" "start" "-a" "9fa7a5dd968688bf91ca892ac517ca4aad1676dba341c7fcfcd039228717de82"`
[INFO] [stderr]    Compiling pairing_heap v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/forward_list.rs:291:7
[INFO] [stderr]     |
[INFO] [stderr] 291 |   let mut x: Vec<_> = a.into_iter().collect();
[INFO] [stderr]     |       ----^
[INFO] [stderr]     |       |
[INFO] [stderr]     |       help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.17s
[INFO] running `"docker" "inspect" "9fa7a5dd968688bf91ca892ac517ca4aad1676dba341c7fcfcd039228717de82"`
[INFO] running `"docker" "rm" "-f" "9fa7a5dd968688bf91ca892ac517ca4aad1676dba341c7fcfcd039228717de82"`
[INFO] [stdout] 9fa7a5dd968688bf91ca892ac517ca4aad1676dba341c7fcfcd039228717de82
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/llwwns/pairing_heap:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] e951477a44bca1e5bfde4257525a4238239826e95a441f809a2bc8f38b5c4b88
[INFO] running `"docker" "start" "-a" "e951477a44bca1e5bfde4257525a4238239826e95a441f809a2bc8f38b5c4b88"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/pairing_heap-c4077524c7dea537
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test forward_list::test ... ok
[INFO] [stderr]      Running /opt/crater/target/debug/deps/main-d82c1a7fd0714f0e
[INFO] [stdout] test test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests pairing_heap
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "e951477a44bca1e5bfde4257525a4238239826e95a441f809a2bc8f38b5c4b88"`
[INFO] running `"docker" "rm" "-f" "e951477a44bca1e5bfde4257525a4238239826e95a441f809a2bc8f38b5c4b88"`
[INFO] [stdout] e951477a44bca1e5bfde4257525a4238239826e95a441f809a2bc8f38b5c4b88