[INFO] updating cached repository gyscos/varf
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/gyscos/varf
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/gyscos/varf" "work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/gyscos/varf" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/gyscos/varf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/gyscos/varf'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5783d1151b18861ff6357341037e152050a0b971
[INFO] sha for GitHub repo gyscos/varf: 5783d1151b18861ff6357341037e152050a0b971
[INFO] validating manifest of gyscos/varf 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 gyscos/varf 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 gyscos/varf
[INFO] finished frobbing gyscos/varf
[INFO] frobbed toml for gyscos/varf written to work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf/Cargo.toml
[INFO] started frobbing gyscos/varf
[INFO] finished frobbing gyscos/varf
[INFO] frobbed toml for gyscos/varf written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/gyscos/varf/Cargo.toml
[INFO] crate gyscos/varf 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] testing gyscos/varf against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 3faa79eb0f112c5ac1fc2f105d29fd3b60e0bb305de11167f60a04b297e45519
[INFO] running `"docker" "start" "-a" "3faa79eb0f112c5ac1fc2f105d29fd3b60e0bb305de11167f60a04b297e45519"`
[INFO] [stderr]    Compiling lazy_static v0.2.4
[INFO] [stderr]    Compiling same-file v0.1.3
[INFO] [stderr]    Compiling sequence_trie v0.2.1
[INFO] [stderr]    Compiling route-recognizer v0.1.11
[INFO] [stderr]    Compiling xdg-basedir v1.0.0
[INFO] [stderr]    Compiling getopts v0.2.14
[INFO] [stderr]    Compiling thread-id v3.0.0
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling serde_json v1.0.2
[INFO] [stderr]    Compiling toml v0.4.1
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr] warning[E0503]: cannot use `state` because it was mutably borrowed
[INFO] [stderr]     --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.14/src/lib.rs:1008:33
[INFO] [stderr]      |
[INFO] [stderr] 955  |     let mut machine = |cont: &mut bool, (i, c): (usize, char)| {
[INFO] [stderr]      |                       ---------------------------------------- borrow of `state` occurs here
[INFO] [stderr] ...
[INFO] [stderr] 959  |         state = match (state, whitespace, limit) {
[INFO] [stderr]      |         ----- borrow occurs due to use of `state` in closure
[INFO] [stderr] ...
[INFO] [stderr] 1008 |     while cont && match state { B | C => true, A => false } {
[INFO] [stderr]      |                                 ^ use of borrowed `state`
[INFO] [stderr] 1009 |         machine(&mut cont, (fake_i, ' '));
[INFO] [stderr]      |         ------- borrow later used here
[INFO] [stderr]      |
[INFO] [stderr]      = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]      = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr] 
[INFO] [stderr]    Compiling thread_local v0.3.3
[INFO] [stderr]    Compiling walkdir v1.0.7
[INFO] [stderr]    Compiling hyper v0.10.5
[INFO] [stderr]    Compiling regex v0.2.1
[INFO] [stderr]    Compiling handlebars v0.26.2
[INFO] [stderr]    Compiling iron v0.5.1
[INFO] [stderr]    Compiling persistent v0.3.0
[INFO] [stderr]    Compiling mount v0.3.0
[INFO] [stderr]    Compiling router v0.5.1
[INFO] [stderr]    Compiling bodyparser v0.5.0
[INFO] [stderr]    Compiling staticfile v0.4.0
[INFO] [stderr]    Compiling urlencoded v0.5.0
[INFO] [stderr]    Compiling handlebars-iron v0.24.1
[INFO] [stderr]    Compiling varf v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/visu.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 | /     divs.iter()
[INFO] [stderr] 72 | |         .rev()
[INFO] [stderr] 73 | |         .map(|k| n / k)
[INFO] [stderr] 74 | |         .collect::<Vec<usize>>()
[INFO] [stderr] 75 | |         .iter()
[INFO] [stderr] 76 | |         .map(|k| divs.push(*k))
[INFO] [stderr] 77 | |         .collect::<Vec<()>>();
[INFO] [stderr]    | |______________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 48.59s
[INFO] running `"docker" "inspect" "3faa79eb0f112c5ac1fc2f105d29fd3b60e0bb305de11167f60a04b297e45519"`
[INFO] running `"docker" "rm" "-f" "3faa79eb0f112c5ac1fc2f105d29fd3b60e0bb305de11167f60a04b297e45519"`
[INFO] [stdout] 3faa79eb0f112c5ac1fc2f105d29fd3b60e0bb305de11167f60a04b297e45519
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] f42688ac2852313347f3f894faa4a74a4b2a756ec0a3f7039f907a95201129fd
[INFO] running `"docker" "start" "-a" "f42688ac2852313347f3f894faa4a74a4b2a756ec0a3f7039f907a95201129fd"`
[INFO] [stderr]    Compiling varf v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/visu.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 | /     divs.iter()
[INFO] [stderr] 72 | |         .rev()
[INFO] [stderr] 73 | |         .map(|k| n / k)
[INFO] [stderr] 74 | |         .collect::<Vec<usize>>()
[INFO] [stderr] 75 | |         .iter()
[INFO] [stderr] 76 | |         .map(|k| divs.push(*k))
[INFO] [stderr] 77 | |         .collect::<Vec<()>>();
[INFO] [stderr]    | |______________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.57s
[INFO] running `"docker" "inspect" "f42688ac2852313347f3f894faa4a74a4b2a756ec0a3f7039f907a95201129fd"`
[INFO] running `"docker" "rm" "-f" "f42688ac2852313347f3f894faa4a74a4b2a756ec0a3f7039f907a95201129fd"`
[INFO] [stdout] f42688ac2852313347f3f894faa4a74a4b2a756ec0a3f7039f907a95201129fd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/gyscos/varf:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] b9da54c606c45c0140f70dd6ea8e72afabef87fec8403935dd372cbd26d89079
[INFO] running `"docker" "start" "-a" "b9da54c606c45c0140f70dd6ea8e72afabef87fec8403935dd372cbd26d89079"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/varf-19c30e6565f09746
[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" "b9da54c606c45c0140f70dd6ea8e72afabef87fec8403935dd372cbd26d89079"`
[INFO] running `"docker" "rm" "-f" "b9da54c606c45c0140f70dd6ea8e72afabef87fec8403935dd372cbd26d89079"`
[INFO] [stdout] b9da54c606c45c0140f70dd6ea8e72afabef87fec8403935dd372cbd26d89079