[INFO] updating cached repository illicitonion/cargo-2018-use-repro
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/illicitonion/cargo-2018-use-repro
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/illicitonion/cargo-2018-use-repro" "work/ex/beta-1.37-6/sources/1.36.0/gh/illicitonion/cargo-2018-use-repro"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/illicitonion/cargo-2018-use-repro'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/illicitonion/cargo-2018-use-repro" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/illicitonion/cargo-2018-use-repro"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/illicitonion/cargo-2018-use-repro'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 62c898a70f9baab942325b9e0dece32c5c0fc1fc
[INFO] sha for GitHub repo illicitonion/cargo-2018-use-repro: 62c898a70f9baab942325b9e0dece32c5c0fc1fc
[INFO] validating manifest of illicitonion/cargo-2018-use-repro 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 illicitonion/cargo-2018-use-repro 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 illicitonion/cargo-2018-use-repro
[INFO] finished frobbing illicitonion/cargo-2018-use-repro
[INFO] frobbed toml for illicitonion/cargo-2018-use-repro written to work/ex/beta-1.37-6/sources/1.36.0/gh/illicitonion/cargo-2018-use-repro/Cargo.toml
[INFO] started frobbing illicitonion/cargo-2018-use-repro
[INFO] finished frobbing illicitonion/cargo-2018-use-repro
[INFO] frobbed toml for illicitonion/cargo-2018-use-repro written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/illicitonion/cargo-2018-use-repro/Cargo.toml
[INFO] crate illicitonion/cargo-2018-use-repro 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 illicitonion/cargo-2018-use-repro 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-4/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/illicitonion/cargo-2018-use-repro:/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] ed8e70d854b4aef04907447fd02a9372940941ab5f12e31efb8af9fbffe23fa8
[INFO] running `"docker" "start" "-a" "ed8e70d854b4aef04907447fd02a9372940941ab5f12e31efb8af9fbffe23fa8"`
[INFO] [stderr]    Compiling rust-use-repro v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `::indexmap`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::indexmap;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `indexmap`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let indexmap = String::new();
[INFO] [stderr]   |         ^^^^^^^^ help: consider prefixing with an underscore: `_indexmap`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `"docker" "inspect" "ed8e70d854b4aef04907447fd02a9372940941ab5f12e31efb8af9fbffe23fa8"`
[INFO] running `"docker" "rm" "-f" "ed8e70d854b4aef04907447fd02a9372940941ab5f12e31efb8af9fbffe23fa8"`
[INFO] [stdout] ed8e70d854b4aef04907447fd02a9372940941ab5f12e31efb8af9fbffe23fa8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/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/illicitonion/cargo-2018-use-repro:/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] 593154108ca4e7f1c32506cb554a0f87a53c18327599c52d3bf99419bfd8858e
[INFO] running `"docker" "start" "-a" "593154108ca4e7f1c32506cb554a0f87a53c18327599c52d3bf99419bfd8858e"`
[INFO] [stderr]    Compiling rust-use-repro v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `::indexmap`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use ::indexmap;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `indexmap`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let indexmap = String::new();
[INFO] [stderr]   |         ^^^^^^^^ help: consider prefixing with an underscore: `_indexmap`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "593154108ca4e7f1c32506cb554a0f87a53c18327599c52d3bf99419bfd8858e"`
[INFO] running `"docker" "rm" "-f" "593154108ca4e7f1c32506cb554a0f87a53c18327599c52d3bf99419bfd8858e"`
[INFO] [stdout] 593154108ca4e7f1c32506cb554a0f87a53c18327599c52d3bf99419bfd8858e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/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/illicitonion/cargo-2018-use-repro:/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] 1464bc1b14a378451f06bd18092716b7eb28decc92cdd2bb604c312552d9ab28
[INFO] running `"docker" "start" "-a" "1464bc1b14a378451f06bd18092716b7eb28decc92cdd2bb604c312552d9ab28"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_use_repro-5fcbb1a82edd8b6e
[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" "1464bc1b14a378451f06bd18092716b7eb28decc92cdd2bb604c312552d9ab28"`
[INFO] running `"docker" "rm" "-f" "1464bc1b14a378451f06bd18092716b7eb28decc92cdd2bb604c312552d9ab28"`
[INFO] [stdout] 1464bc1b14a378451f06bd18092716b7eb28decc92cdd2bb604c312552d9ab28