[INFO] crate handoff_counter 0.8.5 is already in cache
[INFO] extracting crate handoff_counter 0.8.5 into work/ex/beta-1.38-1/sources/1.37.0/reg/handoff_counter/0.8.5
[INFO] extracting crate handoff_counter 0.8.5 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/handoff_counter/0.8.5
[INFO] validating manifest of handoff_counter-0.8.5 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 handoff_counter-0.8.5 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 handoff_counter-0.8.5
[INFO] finished frobbing handoff_counter-0.8.5
[INFO] frobbed toml for handoff_counter-0.8.5 written to work/ex/beta-1.38-1/sources/1.37.0/reg/handoff_counter/0.8.5/Cargo.toml
[INFO] started frobbing handoff_counter-0.8.5
[INFO] finished frobbing handoff_counter-0.8.5
[INFO] frobbed toml for handoff_counter-0.8.5 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/handoff_counter/0.8.5/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 handoff_counter-0.8.5 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/reg/handoff_counter/0.8.5:/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] 1a257902e7f895ad5435aa25b69b62933959b20071995c4bb14c257ab88604b2
[INFO] running `"docker" "start" "-a" "1a257902e7f895ad5435aa25b69b62933959b20071995c4bb14c257ab88604b2"`
[INFO] [stderr]    Compiling handoff_counter v0.8.5 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/handoff_counter.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut v = self.vals.get_mut(&self.id).unwrap();
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Env`
[INFO] [stderr]   --> src/bin/simulate.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | type Env<'a> = HashMap<&'a str, Cnt<'a>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.96s
[INFO] running `"docker" "inspect" "1a257902e7f895ad5435aa25b69b62933959b20071995c4bb14c257ab88604b2"`
[INFO] running `"docker" "rm" "-f" "1a257902e7f895ad5435aa25b69b62933959b20071995c4bb14c257ab88604b2"`
[INFO] [stdout] 1a257902e7f895ad5435aa25b69b62933959b20071995c4bb14c257ab88604b2
[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/reg/handoff_counter/0.8.5:/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] 623798038b281e927ad3bc3c66255daa0fee5fa52c0a42010173689a4f0a3d7f
[INFO] running `"docker" "start" "-a" "623798038b281e927ad3bc3c66255daa0fee5fa52c0a42010173689a4f0a3d7f"`
[INFO] [stderr]    Compiling handoff_counter v0.8.5 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/handoff_counter.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut v = self.vals.get_mut(&self.id).unwrap();
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Env`
[INFO] [stderr]   --> src/bin/simulate.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | type Env<'a> = HashMap<&'a str, Cnt<'a>>;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.86s
[INFO] running `"docker" "inspect" "623798038b281e927ad3bc3c66255daa0fee5fa52c0a42010173689a4f0a3d7f"`
[INFO] running `"docker" "rm" "-f" "623798038b281e927ad3bc3c66255daa0fee5fa52c0a42010173689a4f0a3d7f"`
[INFO] [stdout] 623798038b281e927ad3bc3c66255daa0fee5fa52c0a42010173689a4f0a3d7f
[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/reg/handoff_counter/0.8.5:/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] f4d40210037036c9c1a52f4658734f7e1cb8ca5c51d18cafa857eadf67c45649
[INFO] running `"docker" "start" "-a" "f4d40210037036c9c1a52f4658734f7e1cb8ca5c51d18cafa857eadf67c45649"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/handoff_counter-8089692ace6fa6c0
[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] [stderr]      Running /opt/crater/target/debug/deps/simulate-adea0e9fc635fc1d
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::random_trace_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests handoff_counter
[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" "f4d40210037036c9c1a52f4658734f7e1cb8ca5c51d18cafa857eadf67c45649"`
[INFO] running `"docker" "rm" "-f" "f4d40210037036c9c1a52f4658734f7e1cb8ca5c51d18cafa857eadf67c45649"`
[INFO] [stdout] f4d40210037036c9c1a52f4658734f7e1cb8ca5c51d18cafa857eadf67c45649