[INFO] updating cached repository halu5071/rust-playground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/halu5071/rust-playground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/halu5071/rust-playground" "work/ex/beta-1.38-1/sources/1.37.0/gh/halu5071/rust-playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/halu5071/rust-playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/halu5071/rust-playground" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/halu5071/rust-playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/halu5071/rust-playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f83315ba2481785ab7697c97bb98ed97abf0a6e6
[INFO] sha for GitHub repo halu5071/rust-playground: f83315ba2481785ab7697c97bb98ed97abf0a6e6
[INFO] validating manifest of halu5071/rust-playground 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 halu5071/rust-playground 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 halu5071/rust-playground
[INFO] finished frobbing halu5071/rust-playground
[INFO] frobbed toml for halu5071/rust-playground written to work/ex/beta-1.38-1/sources/1.37.0/gh/halu5071/rust-playground/Cargo.toml
[INFO] started frobbing halu5071/rust-playground
[INFO] finished frobbing halu5071/rust-playground
[INFO] frobbed toml for halu5071/rust-playground written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/halu5071/rust-playground/Cargo.toml
[INFO] crate halu5071/rust-playground 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 halu5071/rust-playground 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/halu5071/rust-playground:/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] a4750c4be29ab68855ee25f505d8c82500cfc8a59a16b015c59abd7c6dd01deb
[INFO] running `"docker" "start" "-a" "a4750c4be29ab68855ee25f505d8c82500cfc8a59a16b015c59abd7c6dd01deb"`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `guess`
[INFO] [stderr]  --> src/guess.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn guess() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `"docker" "inspect" "a4750c4be29ab68855ee25f505d8c82500cfc8a59a16b015c59abd7c6dd01deb"`
[INFO] running `"docker" "rm" "-f" "a4750c4be29ab68855ee25f505d8c82500cfc8a59a16b015c59abd7c6dd01deb"`
[INFO] [stdout] a4750c4be29ab68855ee25f505d8c82500cfc8a59a16b015c59abd7c6dd01deb
[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/halu5071/rust-playground:/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] e9c5e8082d4662a22e2dc72b500380391b752356c058655181e33187dade74bf
[INFO] running `"docker" "start" "-a" "e9c5e8082d4662a22e2dc72b500380391b752356c058655181e33187dade74bf"`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `guess`
[INFO] [stderr]  --> src/guess.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub fn guess() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
[INFO] running `"docker" "inspect" "e9c5e8082d4662a22e2dc72b500380391b752356c058655181e33187dade74bf"`
[INFO] running `"docker" "rm" "-f" "e9c5e8082d4662a22e2dc72b500380391b752356c058655181e33187dade74bf"`
[INFO] [stdout] e9c5e8082d4662a22e2dc72b500380391b752356c058655181e33187dade74bf
[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/halu5071/rust-playground:/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] 280924927f6a91377c7482df442ba5839f2cf4946169c018b2386eac3d793aa5
[INFO] running `"docker" "start" "-a" "280924927f6a91377c7482df442ba5839f2cf4946169c018b2386eac3d793aa5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_playground-3cf4746174dd2aca
[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" "280924927f6a91377c7482df442ba5839f2cf4946169c018b2386eac3d793aa5"`
[INFO] running `"docker" "rm" "-f" "280924927f6a91377c7482df442ba5839f2cf4946169c018b2386eac3d793aa5"`
[INFO] [stdout] 280924927f6a91377c7482df442ba5839f2cf4946169c018b2386eac3d793aa5