Dec 19 14:33:05.073 INFO checking kbacha/string-clone-performance-rust against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 14:33:05.073 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-4/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:33:05.655 INFO [stdout] f348f2aa40f22ab76b8f0c2c344bb56dc59a9436f72fbafa2885f02f46e6eccc
Dec 19 14:33:05.657 INFO running `"docker" "start" "-a" "f348f2aa40f22ab76b8f0c2c344bb56dc59a9436f72fbafa2885f02f46e6eccc"`
Dec 19 14:33:08.049 INFO [stderr]     Checking string-clone-performance v0.1.0 (/opt/crater/workdir)
Dec 19 14:33:08.366 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.366 INFO [stderr]   --> src/main.rs:13:38
Dec 19 14:33:08.366 INFO [stderr]    |
Dec 19 14:33:08.366 INFO [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.366 INFO [stderr]    |                                      ^^^^^^^^^^
Dec 19 14:33:08.366 INFO [stderr]    |
Dec 19 14:33:08.366 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 14:33:08.366 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.366 INFO [stderr] 
Dec 19 14:33:08.366 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.366 INFO [stderr]   --> src/main.rs:15:39
Dec 19 14:33:08.366 INFO [stderr]    |
Dec 19 14:33:08.366 INFO [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.366 INFO [stderr]    |                                       ^^^^^^^^^^
Dec 19 14:33:08.366 INFO [stderr]    |
Dec 19 14:33:08.366 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.366 INFO [stderr] 
Dec 19 14:33:08.366 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.366 INFO [stderr]   --> src/main.rs:17:41
Dec 19 14:33:08.366 INFO [stderr]    |
Dec 19 14:33:08.366 INFO [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.366 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:08.367 INFO [stderr]    |
Dec 19 14:33:08.367 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.367 INFO [stderr] 
Dec 19 14:33:08.367 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.367 INFO [stderr]   --> src/main.rs:19:41
Dec 19 14:33:08.367 INFO [stderr]    |
Dec 19 14:33:08.367 INFO [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
Dec 19 14:33:08.367 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:08.367 INFO [stderr]    |
Dec 19 14:33:08.367 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.367 INFO [stderr] 
Dec 19 14:33:08.388 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.388 INFO [stderr]   --> src/main.rs:13:38
Dec 19 14:33:08.388 INFO [stderr]    |
Dec 19 14:33:08.389 INFO [stderr] 13 |     time("100 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.389 INFO [stderr]    |                                      ^^^^^^^^^^
Dec 19 14:33:08.389 INFO [stderr]    |
Dec 19 14:33:08.390 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 14:33:08.390 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.390 INFO [stderr] 
Dec 19 14:33:08.391 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.391 INFO [stderr]   --> src/main.rs:15:39
Dec 19 14:33:08.392 INFO [stderr]    |
Dec 19 14:33:08.392 INFO [stderr] 15 |     time("1000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.392 INFO [stderr]    |                                       ^^^^^^^^^^
Dec 19 14:33:08.393 INFO [stderr]    |
Dec 19 14:33:08.393 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.393 INFO [stderr] 
Dec 19 14:33:08.393 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.394 INFO [stderr]   --> src/main.rs:17:41
Dec 19 14:33:08.394 INFO [stderr]    |
Dec 19 14:33:08.394 INFO [stderr] 17 |     time("10,000 rs", 100_000_000, || { s.clone(); });
Dec 19 14:33:08.394 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:08.394 INFO [stderr]    |
Dec 19 14:33:08.394 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.395 INFO [stderr] 
Dec 19 14:33:08.395 INFO [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
Dec 19 14:33:08.395 INFO [stderr]   --> src/main.rs:19:41
Dec 19 14:33:08.395 INFO [stderr]    |
Dec 19 14:33:08.396 INFO [stderr] 19 |     time("100,000 rs", 10_000_000, || { s.clone(); });
Dec 19 14:33:08.396 INFO [stderr]    |                                         ^^^^^^^^^^
Dec 19 14:33:08.396 INFO [stderr]    |
Dec 19 14:33:08.396 INFO [stderr]    = note: cloning is often expensive and is not expected to have side effects
Dec 19 14:33:08.397 INFO [stderr] 
Dec 19 14:33:08.480 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
Dec 19 14:33:09.490 INFO running `"docker" "inspect" "f348f2aa40f22ab76b8f0c2c344bb56dc59a9436f72fbafa2885f02f46e6eccc"`
Dec 19 14:33:09.870 INFO running `"docker" "rm" "-f" "f348f2aa40f22ab76b8f0c2c344bb56dc59a9436f72fbafa2885f02f46e6eccc"`
Dec 19 14:33:10.172 INFO [stdout] f348f2aa40f22ab76b8f0c2c344bb56dc59a9436f72fbafa2885f02f46e6eccc