Dec 19 14:33:10.247 INFO checking kbacha/string-clone-performance-rust against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 14:33:10.247 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-4/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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=forbid" "-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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:33:10.742 INFO [stdout] 2deecad935cd898b0016eff2ed7e6de4389bf57c353e0c6ff06a5f79a73f9f4f
Dec 19 14:33:10.744 INFO running `"docker" "start" "-a" "2deecad935cd898b0016eff2ed7e6de4389bf57c353e0c6ff06a5f79a73f9f4f"`
Dec 19 14:33:12.661 INFO [stderr]     Checking string-clone-performance v0.1.0 (/opt/crater/workdir)
Dec 19 14:33:12.964 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:12.964 INFO [stderr]   --> src/main.rs:13:38
Dec 19 14:33:12.964 INFO [stderr]    |
Dec 19 14:33:12.964 INFO [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:12.965 INFO [stderr]    |                                      ^^^^^^^^^^
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 14:33:12.965 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:12.965 INFO [stderr] 
Dec 19 14:33:12.965 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:12.965 INFO [stderr]   --> src/main.rs:15:39
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:12.965 INFO [stderr]    |                                       ^^^^^^^^^^
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:12.965 INFO [stderr] 
Dec 19 14:33:12.965 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:12.965 INFO [stderr]   --> src/main.rs:17:41
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:12.965 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:12.965 INFO [stderr] 
Dec 19 14:33:12.965 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:12.965 INFO [stderr]   --> src/main.rs:19:41
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
Dec 19 14:33:12.965 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:12.965 INFO [stderr]    |
Dec 19 14:33:12.965 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:12.965 INFO [stderr] 
Dec 19 14:33:13.172 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:13.173 INFO [stderr]   --> src/main.rs:13:38
Dec 19 14:33:13.173 INFO [stderr]    |
Dec 19 14:33:13.173 INFO [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:13.174 INFO [stderr]    |                                      ^^^^^^^^^^
Dec 19 14:33:13.174 INFO [stderr]    |
Dec 19 14:33:13.174 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 14:33:13.175 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:13.175 INFO [stderr] 
Dec 19 14:33:13.175 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:13.175 INFO [stderr]   --> src/main.rs:15:39
Dec 19 14:33:13.176 INFO [stderr]    |
Dec 19 14:33:13.176 INFO [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:13.176 INFO [stderr]    |                                       ^^^^^^^^^^
Dec 19 14:33:13.177 INFO [stderr]    |
Dec 19 14:33:13.177 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:13.177 INFO [stderr] 
Dec 19 14:33:13.178 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:13.178 INFO [stderr]   --> src/main.rs:17:41
Dec 19 14:33:13.178 INFO [stderr]    |
Dec 19 14:33:13.178 INFO [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:13.179 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:13.179 INFO [stderr]    |
Dec 19 14:33:13.179 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:13.180 INFO [stderr] 
Dec 19 14:33:13.180 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:13.180 INFO [stderr]   --> src/main.rs:19:41
Dec 19 14:33:13.181 INFO [stderr]    |
Dec 19 14:33:13.181 INFO [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
Dec 19 14:33:13.181 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:13.182 INFO [stderr]    |
Dec 19 14:33:13.182 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:13.182 INFO [stderr] 
Dec 19 14:33:13.192 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
Dec 19 14:33:14.480 INFO running `"docker" "inspect" "2deecad935cd898b0016eff2ed7e6de4389bf57c353e0c6ff06a5f79a73f9f4f"`
Dec 19 14:33:14.822 INFO running `"docker" "rm" "-f" "2deecad935cd898b0016eff2ed7e6de4389bf57c353e0c6ff06a5f79a73f9f4f"`
Dec 19 14:33:14.976 INFO [stdout] 2deecad935cd898b0016eff2ed7e6de4389bf57c353e0c6ff06a5f79a73f9f4f