[INFO] updating cached repository sticnarf/tcping-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sticnarf/tcping-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sticnarf/tcping-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sticnarf/tcping-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sticnarf/tcping-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sticnarf/tcping-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cc71869b09a6f11bbd89f8e6d7058db6a793b5af
[INFO] sha for GitHub repo sticnarf/tcping-rs: cc71869b09a6f11bbd89f8e6d7058db6a793b5af
[INFO] validating manifest of sticnarf/tcping-rs 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 sticnarf/tcping-rs 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 sticnarf/tcping-rs
[INFO] finished frobbing sticnarf/tcping-rs
[INFO] frobbed toml for sticnarf/tcping-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs/Cargo.toml
[INFO] started frobbing sticnarf/tcping-rs
[INFO] finished frobbing sticnarf/tcping-rs
[INFO] frobbed toml for sticnarf/tcping-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sticnarf/tcping-rs/Cargo.toml
[INFO] crate sticnarf/tcping-rs 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 sticnarf/tcping-rs 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs:/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] 06c821786901629898ec030834812596670cbb151c8833a26db4d6a9dc61d18b
[INFO] running `"docker" "start" "-a" "06c821786901629898ec030834812596670cbb151c8833a26db4d6a9dc61d18b"`
[INFO] [stderr]    Compiling tcping v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused imports: `Read`, `Write`
[INFO] [stderr]  --> src/main.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::{Read, Write};
[INFO] [stderr]   |               ^^^^  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:45:12
[INFO] [stderr]    |
[INFO] [stderr] 45 |         Ok(mut addrs) => addrs.filter(|addr| addr.is_ipv4()).next().unwrap(),
[INFO] [stderr]    |            ----^^^^^
[INFO] [stderr]    |            |
[INFO] [stderr]    |            help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.16s
[INFO] running `"docker" "inspect" "06c821786901629898ec030834812596670cbb151c8833a26db4d6a9dc61d18b"`
[INFO] running `"docker" "rm" "-f" "06c821786901629898ec030834812596670cbb151c8833a26db4d6a9dc61d18b"`
[INFO] [stdout] 06c821786901629898ec030834812596670cbb151c8833a26db4d6a9dc61d18b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs:/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] 81ec12cea1798e1dc076420f0b8912c75f9464d6811ed2f7797c4958878b338f
[INFO] running `"docker" "start" "-a" "81ec12cea1798e1dc076420f0b8912c75f9464d6811ed2f7797c4958878b338f"`
[INFO] [stderr]    Compiling tcping v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused imports: `Read`, `Write`
[INFO] [stderr]  --> src/main.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::{Read, Write};
[INFO] [stderr]   |               ^^^^  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:45:12
[INFO] [stderr]    |
[INFO] [stderr] 45 |         Ok(mut addrs) => addrs.filter(|addr| addr.is_ipv4()).next().unwrap(),
[INFO] [stderr]    |            ----^^^^^
[INFO] [stderr]    |            |
[INFO] [stderr]    |            help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "81ec12cea1798e1dc076420f0b8912c75f9464d6811ed2f7797c4958878b338f"`
[INFO] running `"docker" "rm" "-f" "81ec12cea1798e1dc076420f0b8912c75f9464d6811ed2f7797c4958878b338f"`
[INFO] [stdout] 81ec12cea1798e1dc076420f0b8912c75f9464d6811ed2f7797c4958878b338f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sticnarf/tcping-rs:/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] 263ce0c1a8d6f2076cc87584fc7ebbc409121fc430d94c57a7538e247f225d97
[INFO] running `"docker" "start" "-a" "263ce0c1a8d6f2076cc87584fc7ebbc409121fc430d94c57a7538e247f225d97"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tcping-c0e6397d6765332f
[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" "263ce0c1a8d6f2076cc87584fc7ebbc409121fc430d94c57a7538e247f225d97"`
[INFO] running `"docker" "rm" "-f" "263ce0c1a8d6f2076cc87584fc7ebbc409121fc430d94c57a7538e247f225d97"`
[INFO] [stdout] 263ce0c1a8d6f2076cc87584fc7ebbc409121fc430d94c57a7538e247f225d97