[INFO] updating cached repository kbacha/string-clone-performance-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kbacha/string-clone-performance-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kbacha/string-clone-performance-rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kbacha/string-clone-performance-rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kbacha/string-clone-performance-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kbacha/string-clone-performance-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dbbcf257a78bae12cff841f781eac3a6ae9ccac3
[INFO] sha for GitHub repo kbacha/string-clone-performance-rust: dbbcf257a78bae12cff841f781eac3a6ae9ccac3
[INFO] validating manifest of kbacha/string-clone-performance-rust on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kbacha/string-clone-performance-rust on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kbacha/string-clone-performance-rust
[INFO] finished frobbing kbacha/string-clone-performance-rust
[INFO] frobbed toml for kbacha/string-clone-performance-rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-rust/Cargo.toml
[INFO] started frobbing kbacha/string-clone-performance-rust
[INFO] finished frobbing kbacha/string-clone-performance-rust
[INFO] frobbed toml for kbacha/string-clone-performance-rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kbacha/string-clone-performance-rust/Cargo.toml
[INFO] crate kbacha/string-clone-performance-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing kbacha/string-clone-performance-rust against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] c9704965db4fc0c7a938023274007c13bf8b3bcf32984e45609edf3da3314fe7
[INFO] running `"docker" "start" "-a" "c9704965db4fc0c7a938023274007c13bf8b3bcf32984e45609edf3da3314fe7"`
[INFO] [stderr]    Compiling string-clone-performance v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:13:38
[INFO] [stderr]    |
[INFO] [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                      ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:15:39
[INFO] [stderr]    |
[INFO] [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                       ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:17:41
[INFO] [stderr]    |
[INFO] [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:19:41
[INFO] [stderr]    |
[INFO] [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
[INFO] [stderr]    |                                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `"docker" "inspect" "c9704965db4fc0c7a938023274007c13bf8b3bcf32984e45609edf3da3314fe7"`
[INFO] running `"docker" "rm" "-f" "c9704965db4fc0c7a938023274007c13bf8b3bcf32984e45609edf3da3314fe7"`
[INFO] [stdout] c9704965db4fc0c7a938023274007c13bf8b3bcf32984e45609edf3da3314fe7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] a2153069595cc105f7ee54ea3cc195ec7c2dd4d7d6c1a8ab903f381c3256de2a
[INFO] running `"docker" "start" "-a" "a2153069595cc105f7ee54ea3cc195ec7c2dd4d7d6c1a8ab903f381c3256de2a"`
[INFO] [stderr]    Compiling string-clone-performance v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:13:38
[INFO] [stderr]    |
[INFO] [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                      ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:15:39
[INFO] [stderr]    |
[INFO] [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                       ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:17:41
[INFO] [stderr]    |
[INFO] [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
[INFO] [stderr]    |                                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/main.rs:19:41
[INFO] [stderr]    |
[INFO] [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
[INFO] [stderr]    |                                         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `"docker" "inspect" "a2153069595cc105f7ee54ea3cc195ec7c2dd4d7d6c1a8ab903f381c3256de2a"`
[INFO] running `"docker" "rm" "-f" "a2153069595cc105f7ee54ea3cc195ec7c2dd4d7d6c1a8ab903f381c3256de2a"`
[INFO] [stdout] a2153069595cc105f7ee54ea3cc195ec7c2dd4d7d6c1a8ab903f381c3256de2a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/kbacha/string-clone-performance-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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] a2fd42d6016b0d2c43d707b16fcbdf0b8e623665e72b1eeaa15b09e52f9e5cd4
[INFO] running `"docker" "start" "-a" "a2fd42d6016b0d2c43d707b16fcbdf0b8e623665e72b1eeaa15b09e52f9e5cd4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/string_clone_performance-14e9c9b210779c45
[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" "a2fd42d6016b0d2c43d707b16fcbdf0b8e623665e72b1eeaa15b09e52f9e5cd4"`
[INFO] running `"docker" "rm" "-f" "a2fd42d6016b0d2c43d707b16fcbdf0b8e623665e72b1eeaa15b09e52f9e5cd4"`
[INFO] [stdout] a2fd42d6016b0d2c43d707b16fcbdf0b8e623665e72b1eeaa15b09e52f9e5cd4