[INFO] updating cached repository Jonwod/ping_pong
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Jonwod/ping_pong
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Jonwod/ping_pong" "work/ex/beta-1.38-1/sources/1.37.0/gh/Jonwod/ping_pong"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Jonwod/ping_pong'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Jonwod/ping_pong" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 50a757fe8f53d3375033a2d19b5266a73e9958a3
[INFO] sha for GitHub repo Jonwod/ping_pong: 50a757fe8f53d3375033a2d19b5266a73e9958a3
[INFO] validating manifest of Jonwod/ping_pong 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 Jonwod/ping_pong 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 Jonwod/ping_pong
[INFO] finished frobbing Jonwod/ping_pong
[INFO] frobbed toml for Jonwod/ping_pong written to work/ex/beta-1.38-1/sources/1.37.0/gh/Jonwod/ping_pong/Cargo.toml
[INFO] started frobbing Jonwod/ping_pong
[INFO] finished frobbing Jonwod/ping_pong
[INFO] frobbed toml for Jonwod/ping_pong written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong/Cargo.toml
[INFO] crate Jonwod/ping_pong 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 Jonwod/ping_pong against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 398a73601709106197cea2483ff73f64b0f48fe6c557d898f7c68327110f3420
[INFO] running `"docker" "start" "-a" "398a73601709106197cea2483ff73f64b0f48fe6c557d898f7c68327110f3420"`
[INFO] [stderr]    Compiling ping_pong v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut buff = &mut [0 as u8];
[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 0.96s
[INFO] running `"docker" "inspect" "398a73601709106197cea2483ff73f64b0f48fe6c557d898f7c68327110f3420"`
[INFO] running `"docker" "rm" "-f" "398a73601709106197cea2483ff73f64b0f48fe6c557d898f7c68327110f3420"`
[INFO] [stdout] 398a73601709106197cea2483ff73f64b0f48fe6c557d898f7c68327110f3420
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong:/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] b013ea0f6011e87bb37c59a8b944949c3671d4f812746a1af2ac150329041fbb
[INFO] running `"docker" "start" "-a" "b013ea0f6011e87bb37c59a8b944949c3671d4f812746a1af2ac150329041fbb"`
[INFO] [stderr]    Compiling ping_pong v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut buff = &mut [0 as u8];
[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 0.75s
[INFO] running `"docker" "inspect" "b013ea0f6011e87bb37c59a8b944949c3671d4f812746a1af2ac150329041fbb"`
[INFO] running `"docker" "rm" "-f" "b013ea0f6011e87bb37c59a8b944949c3671d4f812746a1af2ac150329041fbb"`
[INFO] [stdout] b013ea0f6011e87bb37c59a8b944949c3671d4f812746a1af2ac150329041fbb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jonwod/ping_pong:/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 8ace12000f5d3a9203c795a98502b0f842cc6011bda87241dcf7dc7fc3a7c3a4
[INFO] running `"docker" "start" "-a" "8ace12000f5d3a9203c795a98502b0f842cc6011bda87241dcf7dc7fc3a7c3a4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ping_pong-ba31ab68f38cc442
[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" "8ace12000f5d3a9203c795a98502b0f842cc6011bda87241dcf7dc7fc3a7c3a4"`
[INFO] running `"docker" "rm" "-f" "8ace12000f5d3a9203c795a98502b0f842cc6011bda87241dcf7dc7fc3a7c3a4"`
[INFO] [stdout] 8ace12000f5d3a9203c795a98502b0f842cc6011bda87241dcf7dc7fc3a7c3a4