[INFO] crate ai 0.1.0 is already in cache
[INFO] extracting crate ai 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/ai/0.1.0
[INFO] extracting crate ai 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ai/0.1.0
[INFO] validating manifest of ai-0.1.0 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 ai-0.1.0 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 ai-0.1.0
[INFO] finished frobbing ai-0.1.0
[INFO] frobbed toml for ai-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/ai/0.1.0/Cargo.toml
[INFO] started frobbing ai-0.1.0
[INFO] finished frobbing ai-0.1.0
[INFO] frobbed toml for ai-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ai/0.1.0/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] building ai-0.1.0 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/ai/0.1.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 907af570b3a5bd2fb4dbf9273715847bee73c2fdda28161563c436fb1a30f731
[INFO] running `"docker" "start" "-a" "907af570b3a5bd2fb4dbf9273715847bee73c2fdda28161563c436fb1a30f731"`
[INFO] [stderr]    Compiling ai v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "907af570b3a5bd2fb4dbf9273715847bee73c2fdda28161563c436fb1a30f731"`
[INFO] running `"docker" "rm" "-f" "907af570b3a5bd2fb4dbf9273715847bee73c2fdda28161563c436fb1a30f731"`
[INFO] [stdout] 907af570b3a5bd2fb4dbf9273715847bee73c2fdda28161563c436fb1a30f731
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/ai/0.1.0:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 27a16371fc0941e5fb0ee6cce22639f54c4f5635209df0664b8fa00d47229287
[INFO] running `"docker" "start" "-a" "27a16371fc0941e5fb0ee6cce22639f54c4f5635209df0664b8fa00d47229287"`
[INFO] [stderr]    Compiling ai v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `new_indv` is never read
[INFO] [stderr]    --> src/chromosome.rs:139:17
[INFO] [stderr]     |
[INFO] [stderr] 139 |         let mut new_indv = Vec::new();
[INFO] [stderr]     |                 ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `new_indv` is never read
[INFO] [stderr]    --> src/chromosome.rs:149:17
[INFO] [stderr]     |
[INFO] [stderr] 149 |         let mut new_indv = Vec::new();
[INFO] [stderr]     |                 ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/chromosome.rs:103:13
[INFO] [stderr]     |
[INFO] [stderr] 103 |         let mut individual = Chromosome::new();
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `"docker" "inspect" "27a16371fc0941e5fb0ee6cce22639f54c4f5635209df0664b8fa00d47229287"`
[INFO] running `"docker" "rm" "-f" "27a16371fc0941e5fb0ee6cce22639f54c4f5635209df0664b8fa00d47229287"`
[INFO] [stdout] 27a16371fc0941e5fb0ee6cce22639f54c4f5635209df0664b8fa00d47229287