[INFO] crate conjecture 0.4.0 is already in cache
[INFO] extracting crate conjecture 0.4.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/conjecture/0.4.0
[INFO] extracting crate conjecture 0.4.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conjecture/0.4.0
[INFO] validating manifest of conjecture-0.4.0 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 conjecture-0.4.0 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 conjecture-0.4.0
[INFO] finished frobbing conjecture-0.4.0
[INFO] frobbed toml for conjecture-0.4.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/conjecture/0.4.0/Cargo.toml
[INFO] started frobbing conjecture-0.4.0
[INFO] finished frobbing conjecture-0.4.0
[INFO] frobbed toml for conjecture-0.4.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conjecture/0.4.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 conjecture-0.4.0 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/reg/conjecture/0.4.0:/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] f680a0e7c170ec328eadba4406a07cade2c45547c600e147a7154a45a3a66041
[INFO] running `"docker" "start" "-a" "f680a0e7c170ec328eadba4406a07cade2c45547c600e147a7154a45a3a66041"`
[INFO] [stderr]    Compiling conjecture v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/engine.rs:157:21
[INFO] [stderr]     |
[INFO] [stderr] 157 |                 let mut minimized_examples = &mut self.minimized_examples;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/engine.rs:158:21
[INFO] [stderr]     |
[INFO] [stderr] 158 |                 let mut database = &mut self.database;
[INFO] [stderr]     |                     ----^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.34s
[INFO] running `"docker" "inspect" "f680a0e7c170ec328eadba4406a07cade2c45547c600e147a7154a45a3a66041"`
[INFO] running `"docker" "rm" "-f" "f680a0e7c170ec328eadba4406a07cade2c45547c600e147a7154a45a3a66041"`
[INFO] [stdout] f680a0e7c170ec328eadba4406a07cade2c45547c600e147a7154a45a3a66041
[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/reg/conjecture/0.4.0:/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] 97a24b2f15d8b75a10c76a84932430f57a6863c3d9e6ba006f9b40816d843d59
[INFO] running `"docker" "start" "-a" "97a24b2f15d8b75a10c76a84932430f57a6863c3d9e6ba006f9b40816d843d59"`
[INFO] [stderr]    Compiling conjecture v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/engine.rs:157:21
[INFO] [stderr]     |
[INFO] [stderr] 157 |                 let mut minimized_examples = &mut self.minimized_examples;
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/engine.rs:158:21
[INFO] [stderr]     |
[INFO] [stderr] 158 |                 let mut database = &mut self.database;
[INFO] [stderr]     |                     ----^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.59s
[INFO] running `"docker" "inspect" "97a24b2f15d8b75a10c76a84932430f57a6863c3d9e6ba006f9b40816d843d59"`
[INFO] running `"docker" "rm" "-f" "97a24b2f15d8b75a10c76a84932430f57a6863c3d9e6ba006f9b40816d843d59"`
[INFO] [stdout] 97a24b2f15d8b75a10c76a84932430f57a6863c3d9e6ba006f9b40816d843d59
[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/reg/conjecture/0.4.0:/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] a350e37673051ff8d47fa84b062a13cc56b1326cf4a219dbd0aaa3aad708cd9f
[INFO] running `"docker" "start" "-a" "a350e37673051ff8d47fa84b062a13cc56b1326cf4a219dbd0aaa3aad708cd9f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/conjecture-448e746fbea69870
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test intminimize::tests::minimize_down_to ... ok
[INFO] [stdout] test intminimize::tests::unset_relevant_bits ... ok
[INFO] [stdout] test intminimize::tests::sort_bits ... ok
[INFO] [stdout] test database::tests::can_delete_non_existing_key ... ok
[INFO] [stdout] test database::tests::can_delete_key ... ok
[INFO] [stdout] test database::tests::appears_in_listing_after_saving ... ok
[INFO] [stdout] test engine::tests::minimizes_all_examples ... ok
[INFO] [stderr]    Doc-tests conjecture
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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" "a350e37673051ff8d47fa84b062a13cc56b1326cf4a219dbd0aaa3aad708cd9f"`
[INFO] running `"docker" "rm" "-f" "a350e37673051ff8d47fa84b062a13cc56b1326cf4a219dbd0aaa3aad708cd9f"`
[INFO] [stdout] a350e37673051ff8d47fa84b062a13cc56b1326cf4a219dbd0aaa3aad708cd9f