[INFO] updating cached repository Parfyonator/merkle_tree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Parfyonator/merkle_tree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Parfyonator/merkle_tree" "work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Parfyonator/merkle_tree" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Parfyonator/merkle_tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Parfyonator/merkle_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f6b7198d3fd038d998f0dc6a081148368f09ed39
[INFO] sha for GitHub repo Parfyonator/merkle_tree: f6b7198d3fd038d998f0dc6a081148368f09ed39
[INFO] validating manifest of Parfyonator/merkle_tree 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 Parfyonator/merkle_tree 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 Parfyonator/merkle_tree
[INFO] finished frobbing Parfyonator/merkle_tree
[INFO] frobbed toml for Parfyonator/merkle_tree written to work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree/Cargo.toml
[INFO] started frobbing Parfyonator/merkle_tree
[INFO] finished frobbing Parfyonator/merkle_tree
[INFO] frobbed toml for Parfyonator/merkle_tree written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Parfyonator/merkle_tree/Cargo.toml
[INFO] crate Parfyonator/merkle_tree 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 Parfyonator/merkle_tree 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree:/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] 6589db13fe364498e606c028bb36cdcd04654382d914956d84a4cb121c5cf33e
[INFO] running `"docker" "start" "-a" "6589db13fe364498e606c028bb36cdcd04654382d914956d84a4cb121c5cf33e"`
[INFO] [stderr]    Compiling hyper v0.10.5
[INFO] [stderr]    Compiling merkle_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `add_child`
[INFO] [stderr]   --> src/merkle_tree.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn add_child(&mut self, new_val: String) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `has_children`
[INFO] [stderr]   --> src/merkle_tree.rs:74:5
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn has_children(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.58s
[INFO] running `"docker" "inspect" "6589db13fe364498e606c028bb36cdcd04654382d914956d84a4cb121c5cf33e"`
[INFO] running `"docker" "rm" "-f" "6589db13fe364498e606c028bb36cdcd04654382d914956d84a4cb121c5cf33e"`
[INFO] [stdout] 6589db13fe364498e606c028bb36cdcd04654382d914956d84a4cb121c5cf33e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree:/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] a3807b0115d753654518e9c35b82794d3026948ccaaf12df6b2ae6b25f64c53b
[INFO] running `"docker" "start" "-a" "a3807b0115d753654518e9c35b82794d3026948ccaaf12df6b2ae6b25f64c53b"`
[INFO] [stderr]    Compiling merkle_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `add_child`
[INFO] [stderr]   --> src/merkle_tree.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn add_child(&mut self, new_val: String) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `has_children`
[INFO] [stderr]   --> src/merkle_tree.rs:74:5
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn has_children(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.93s
[INFO] running `"docker" "inspect" "a3807b0115d753654518e9c35b82794d3026948ccaaf12df6b2ae6b25f64c53b"`
[INFO] running `"docker" "rm" "-f" "a3807b0115d753654518e9c35b82794d3026948ccaaf12df6b2ae6b25f64c53b"`
[INFO] [stdout] a3807b0115d753654518e9c35b82794d3026948ccaaf12df6b2ae6b25f64c53b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Parfyonator/merkle_tree:/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] 23e62cd35cdefcc99afda6426d0f6fa0e40f2f71a3d173f5b91af4da79351645
[INFO] running `"docker" "start" "-a" "23e62cd35cdefcc99afda6426d0f6fa0e40f2f71a3d173f5b91af4da79351645"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/merkle_tree-2c3b587b277e479c
[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" "23e62cd35cdefcc99afda6426d0f6fa0e40f2f71a3d173f5b91af4da79351645"`
[INFO] running `"docker" "rm" "-f" "23e62cd35cdefcc99afda6426d0f6fa0e40f2f71a3d173f5b91af4da79351645"`
[INFO] [stdout] 23e62cd35cdefcc99afda6426d0f6fa0e40f2f71a3d173f5b91af4da79351645