[INFO] updating cached repository azengard/hello-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/azengard/hello-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/azengard/hello-rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/azengard/hello-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/azengard/hello-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/azengard/hello-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/azengard/hello-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/azengard/hello-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5586f5c58001275e8b445ca5a89a4cea6b755863
[INFO] sha for GitHub repo azengard/hello-rust: 5586f5c58001275e8b445ca5a89a4cea6b755863
[INFO] validating manifest of azengard/hello-rust 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 azengard/hello-rust 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 azengard/hello-rust
[INFO] finished frobbing azengard/hello-rust
[INFO] frobbed toml for azengard/hello-rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/azengard/hello-rust/Cargo.toml
[INFO] started frobbing azengard/hello-rust
[INFO] finished frobbing azengard/hello-rust
[INFO] frobbed toml for azengard/hello-rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/azengard/hello-rust/Cargo.toml
[INFO] crate azengard/hello-rust 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 azengard/hello-rust 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/azengard/hello-rust:/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] 1b26ccf7c45455ab2c6b411ad615311d32651c0832cd6d96aaa94189d65a05da
[INFO] running `"docker" "start" "-a" "1b26ccf7c45455ab2c6b411ad615311d32651c0832cd6d96aaa94189d65a05da"`
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Nil`
[INFO] [stderr]   --> src/main.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | struct Nil; // unit struct
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Pair`
[INFO] [stderr]   --> src/main.rs:82:1
[INFO] [stderr]    |
[INFO] [stderr] 82 | struct Pair(i32, f32); //tuple struct
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `"docker" "inspect" "1b26ccf7c45455ab2c6b411ad615311d32651c0832cd6d96aaa94189d65a05da"`
[INFO] running `"docker" "rm" "-f" "1b26ccf7c45455ab2c6b411ad615311d32651c0832cd6d96aaa94189d65a05da"`
[INFO] [stdout] 1b26ccf7c45455ab2c6b411ad615311d32651c0832cd6d96aaa94189d65a05da
[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/azengard/hello-rust:/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] 40723a55e601806299bf50497abd9215d306682d052fcc090eb8b4464d75d0a4
[INFO] running `"docker" "start" "-a" "40723a55e601806299bf50497abd9215d306682d052fcc090eb8b4464d75d0a4"`
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Nil`
[INFO] [stderr]   --> src/main.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | struct Nil; // unit struct
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Pair`
[INFO] [stderr]   --> src/main.rs:82:1
[INFO] [stderr]    |
[INFO] [stderr] 82 | struct Pair(i32, f32); //tuple struct
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "40723a55e601806299bf50497abd9215d306682d052fcc090eb8b4464d75d0a4"`
[INFO] running `"docker" "rm" "-f" "40723a55e601806299bf50497abd9215d306682d052fcc090eb8b4464d75d0a4"`
[INFO] [stdout] 40723a55e601806299bf50497abd9215d306682d052fcc090eb8b4464d75d0a4
[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/azengard/hello-rust:/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] 4b0a2cd3d07c0eebab53693d3ba98af7aa11735ad173735e45219c0ff57ad40d
[INFO] running `"docker" "start" "-a" "4b0a2cd3d07c0eebab53693d3ba98af7aa11735ad173735e45219c0ff57ad40d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hello_rust-755e88a62723921e
[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" "4b0a2cd3d07c0eebab53693d3ba98af7aa11735ad173735e45219c0ff57ad40d"`
[INFO] running `"docker" "rm" "-f" "4b0a2cd3d07c0eebab53693d3ba98af7aa11735ad173735e45219c0ff57ad40d"`
[INFO] [stdout] 4b0a2cd3d07c0eebab53693d3ba98af7aa11735ad173735e45219c0ff57ad40d