[INFO] crate bpg 2.1.0 is already in cache
[INFO] extracting crate bpg 2.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/bpg/2.1.0
[INFO] extracting crate bpg 2.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/bpg/2.1.0
[INFO] validating manifest of bpg-2.1.0 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 bpg-2.1.0 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 bpg-2.1.0
[INFO] finished frobbing bpg-2.1.0
[INFO] frobbed toml for bpg-2.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/bpg/2.1.0/Cargo.toml
[INFO] started frobbing bpg-2.1.0
[INFO] finished frobbing bpg-2.1.0
[INFO] frobbed toml for bpg-2.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/bpg/2.1.0/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] testing bpg-2.1.0 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/bpg/2.1.0:/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] fd3661314afeb3c7060b27aa5ae7d3bf5aa31c0e4f024f4bd2c7f4101c546389
[INFO] running `"docker" "start" "-a" "fd3661314afeb3c7060b27aa5ae7d3bf5aa31c0e4f024f4bd2c7f4101c546389"`
[INFO] [stderr]    Compiling bpg v2.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:118:21
[INFO] [stderr]     |
[INFO] [stderr] 118 |                 let mut recipients: String;
[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 1.32s
[INFO] running `"docker" "inspect" "fd3661314afeb3c7060b27aa5ae7d3bf5aa31c0e4f024f4bd2c7f4101c546389"`
[INFO] running `"docker" "rm" "-f" "fd3661314afeb3c7060b27aa5ae7d3bf5aa31c0e4f024f4bd2c7f4101c546389"`
[INFO] [stdout] fd3661314afeb3c7060b27aa5ae7d3bf5aa31c0e4f024f4bd2c7f4101c546389
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/bpg/2.1.0:/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] 82432d74bf51acd3f3bf2a305ecb5cf15f96e5829cdc38e586d95c03706c919d
[INFO] running `"docker" "start" "-a" "82432d74bf51acd3f3bf2a305ecb5cf15f96e5829cdc38e586d95c03706c919d"`
[INFO] [stderr]    Compiling bpg v2.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:118:21
[INFO] [stderr]     |
[INFO] [stderr] 118 |                 let mut recipients: String;
[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 0.48s
[INFO] running `"docker" "inspect" "82432d74bf51acd3f3bf2a305ecb5cf15f96e5829cdc38e586d95c03706c919d"`
[INFO] running `"docker" "rm" "-f" "82432d74bf51acd3f3bf2a305ecb5cf15f96e5829cdc38e586d95c03706c919d"`
[INFO] [stdout] 82432d74bf51acd3f3bf2a305ecb5cf15f96e5829cdc38e586d95c03706c919d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/bpg/2.1.0:/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"`
[INFO] [stdout] 21b45613f4ad8549b2b43160944ca99ff89d52af5d54eb6f6f29ca5a1e5e3965
[INFO] running `"docker" "start" "-a" "21b45613f4ad8549b2b43160944ca99ff89d52af5d54eb6f6f29ca5a1e5e3965"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/bpg-44d33d5b7e236fea
[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" "21b45613f4ad8549b2b43160944ca99ff89d52af5d54eb6f6f29ca5a1e5e3965"`
[INFO] running `"docker" "rm" "-f" "21b45613f4ad8549b2b43160944ca99ff89d52af5d54eb6f6f29ca5a1e5e3965"`
[INFO] [stdout] 21b45613f4ad8549b2b43160944ca99ff89d52af5d54eb6f6f29ca5a1e5e3965