[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 beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] c42d668e7afdc91635df953a3e3fa6a25f05899fb448b6b79d56cae33774fd54
[INFO] running `"docker" "start" "-a" "c42d668e7afdc91635df953a3e3fa6a25f05899fb448b6b79d56cae33774fd54"`
[INFO] [stderr]    Compiling ai v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `"docker" "inspect" "c42d668e7afdc91635df953a3e3fa6a25f05899fb448b6b79d56cae33774fd54"`
[INFO] running `"docker" "rm" "-f" "c42d668e7afdc91635df953a3e3fa6a25f05899fb448b6b79d56cae33774fd54"`
[INFO] [stdout] c42d668e7afdc91635df953a3e3fa6a25f05899fb448b6b79d56cae33774fd54
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 834b96209729309cf98e99963f7d63c902fa90d8c8cdda1f71bbef7fa3e03f16
[INFO] running `"docker" "start" "-a" "834b96209729309cf98e99963f7d63c902fa90d8c8cdda1f71bbef7fa3e03f16"`
[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 0.71s
[INFO] running `"docker" "inspect" "834b96209729309cf98e99963f7d63c902fa90d8c8cdda1f71bbef7fa3e03f16"`
[INFO] running `"docker" "rm" "-f" "834b96209729309cf98e99963f7d63c902fa90d8c8cdda1f71bbef7fa3e03f16"`
[INFO] [stdout] 834b96209729309cf98e99963f7d63c902fa90d8c8cdda1f71bbef7fa3e03f16