[INFO] updating cached repository chupe/rust-collections
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/chupe/rust-collections
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/chupe/rust-collections" "work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/chupe/rust-collections" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/chupe/rust-collections"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/chupe/rust-collections'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 14f0a55b31bb8800ee655d4abb83a7db516f6fd2
[INFO] sha for GitHub repo chupe/rust-collections: 14f0a55b31bb8800ee655d4abb83a7db516f6fd2
[INFO] validating manifest of chupe/rust-collections 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 chupe/rust-collections 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 chupe/rust-collections
[INFO] finished frobbing chupe/rust-collections
[INFO] frobbed toml for chupe/rust-collections written to work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections/Cargo.toml
[INFO] started frobbing chupe/rust-collections
[INFO] finished frobbing chupe/rust-collections
[INFO] frobbed toml for chupe/rust-collections written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/chupe/rust-collections/Cargo.toml
[INFO] crate chupe/rust-collections 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 chupe/rust-collections 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections:/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] d9754b6f1f7d6052c5c1c3fdeec41500441f11eda71165c1cc3cc57acb192dfd
[INFO] running `"docker" "start" "-a" "d9754b6f1f7d6052c5c1c3fdeec41500441f11eda71165c1cc3cc57acb192dfd"`
[INFO] [stderr]    Compiling collections v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `median_result` is never read
[INFO] [stderr]   --> src/main.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let mut median_result: f32 = 0.0;
[INFO] [stderr]    |             ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `"docker" "inspect" "d9754b6f1f7d6052c5c1c3fdeec41500441f11eda71165c1cc3cc57acb192dfd"`
[INFO] running `"docker" "rm" "-f" "d9754b6f1f7d6052c5c1c3fdeec41500441f11eda71165c1cc3cc57acb192dfd"`
[INFO] [stdout] d9754b6f1f7d6052c5c1c3fdeec41500441f11eda71165c1cc3cc57acb192dfd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections:/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] 8ad8bc5115a07a1d26b26c21d0eba6e1350e07c14a8a683ddcee4f0da02d07e2
[INFO] running `"docker" "start" "-a" "8ad8bc5115a07a1d26b26c21d0eba6e1350e07c14a8a683ddcee4f0da02d07e2"`
[INFO] [stderr]    Compiling collections v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `median_result` is never read
[INFO] [stderr]   --> src/main.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let mut median_result: f32 = 0.0;
[INFO] [stderr]    |             ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `"docker" "inspect" "8ad8bc5115a07a1d26b26c21d0eba6e1350e07c14a8a683ddcee4f0da02d07e2"`
[INFO] running `"docker" "rm" "-f" "8ad8bc5115a07a1d26b26c21d0eba6e1350e07c14a8a683ddcee4f0da02d07e2"`
[INFO] [stdout] 8ad8bc5115a07a1d26b26c21d0eba6e1350e07c14a8a683ddcee4f0da02d07e2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/chupe/rust-collections:/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] 70e078c934673a7fa7bb6f7c0d355c6a656055d5d12f1279b0753b17a56f56ea
[INFO] running `"docker" "start" "-a" "70e078c934673a7fa7bb6f7c0d355c6a656055d5d12f1279b0753b17a56f56ea"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections-835c290ab73092e5
[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" "70e078c934673a7fa7bb6f7c0d355c6a656055d5d12f1279b0753b17a56f56ea"`
[INFO] running `"docker" "rm" "-f" "70e078c934673a7fa7bb6f7c0d355c6a656055d5d12f1279b0753b17a56f56ea"`
[INFO] [stdout] 70e078c934673a7fa7bb6f7c0d355c6a656055d5d12f1279b0753b17a56f56ea