[INFO] updating cached repository mplanchard/combinations
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mplanchard/combinations
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mplanchard/combinations" "work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mplanchard/combinations" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mplanchard/combinations"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mplanchard/combinations'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f5168b543d93ebab3848de11af6ddde30027461d
[INFO] sha for GitHub repo mplanchard/combinations: f5168b543d93ebab3848de11af6ddde30027461d
[INFO] validating manifest of mplanchard/combinations on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mplanchard/combinations on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mplanchard/combinations
[INFO] finished frobbing mplanchard/combinations
[INFO] frobbed toml for mplanchard/combinations written to work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations/Cargo.toml
[INFO] started frobbing mplanchard/combinations
[INFO] finished frobbing mplanchard/combinations
[INFO] frobbed toml for mplanchard/combinations written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mplanchard/combinations/Cargo.toml
[INFO] crate mplanchard/combinations already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mplanchard/combinations against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] ad5e5e4b0d9b589fe6e165687beb1ba09468906fe6f5119422b4e7df4079564d
[INFO] running `"docker" "start" "-a" "ad5e5e4b0d9b589fe6e165687beb1ba09468906fe6f5119422b4e7df4079564d"`
[INFO] [stderr]    Compiling num-bigint v0.2.1
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling combinations v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::slice`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::slice;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_one`
[INFO] [stderr]    --> src/main.rs:123:9
[INFO] [stderr]     |
[INFO] [stderr] 123 |     let slice_one: &[i32] = &[1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: consider prefixing with an underscore: `_slice_one`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_two`
[INFO] [stderr]    --> src/main.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let slice_two: &[i32] = &[3, 4];
[INFO] [stderr]     |         ^^^^^^^^^ help: consider prefixing with an underscore: `_slice_two`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `num_combinations`
[INFO] [stderr]   --> src/main.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn num_combinations(num_items: u64, take: u64) -> BigUint {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print`
[INFO] [stderr]   --> src/main.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn print<T: Iterator + std::fmt::Debug>(thing: T) -> T{
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.62s
[INFO] running `"docker" "inspect" "ad5e5e4b0d9b589fe6e165687beb1ba09468906fe6f5119422b4e7df4079564d"`
[INFO] running `"docker" "rm" "-f" "ad5e5e4b0d9b589fe6e165687beb1ba09468906fe6f5119422b4e7df4079564d"`
[INFO] [stdout] ad5e5e4b0d9b589fe6e165687beb1ba09468906fe6f5119422b4e7df4079564d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 69bbce5b61531f5e1d016d47c8769a79e75b75cd204d533d098584eab1b62fe0
[INFO] running `"docker" "start" "-a" "69bbce5b61531f5e1d016d47c8769a79e75b75cd204d533d098584eab1b62fe0"`
[INFO] [stderr]    Compiling combinations v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::slice`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::slice;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_one`
[INFO] [stderr]    --> src/main.rs:123:9
[INFO] [stderr]     |
[INFO] [stderr] 123 |     let slice_one: &[i32] = &[1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: consider prefixing with an underscore: `_slice_one`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice_two`
[INFO] [stderr]    --> src/main.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let slice_two: &[i32] = &[3, 4];
[INFO] [stderr]     |         ^^^^^^^^^ help: consider prefixing with an underscore: `_slice_two`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `num_combinations`
[INFO] [stderr]   --> src/main.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn num_combinations(num_items: u64, take: u64) -> BigUint {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print`
[INFO] [stderr]   --> src/main.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn print<T: Iterator + std::fmt::Debug>(thing: T) -> T{
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `"docker" "inspect" "69bbce5b61531f5e1d016d47c8769a79e75b75cd204d533d098584eab1b62fe0"`
[INFO] running `"docker" "rm" "-f" "69bbce5b61531f5e1d016d47c8769a79e75b75cd204d533d098584eab1b62fe0"`
[INFO] [stdout] 69bbce5b61531f5e1d016d47c8769a79e75b75cd204d533d098584eab1b62fe0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mplanchard/combinations:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 0757dfc3ae24c90ce7df0813609eeec04ad56cf6b9b8cfdb3a97c224dc3153bd
[INFO] running `"docker" "start" "-a" "0757dfc3ae24c90ce7df0813609eeec04ad56cf6b9b8cfdb3a97c224dc3153bd"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/combinations-d9f5cffaf87237e6
[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" "0757dfc3ae24c90ce7df0813609eeec04ad56cf6b9b8cfdb3a97c224dc3153bd"`
[INFO] running `"docker" "rm" "-f" "0757dfc3ae24c90ce7df0813609eeec04ad56cf6b9b8cfdb3a97c224dc3153bd"`
[INFO] [stdout] 0757dfc3ae24c90ce7df0813609eeec04ad56cf6b9b8cfdb3a97c224dc3153bd