[INFO] crate cargo-example 0.1.1 is already in cache
[INFO] extracting crate cargo-example 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-example/0.1.1
[INFO] extracting crate cargo-example 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cargo-example/0.1.1
[INFO] validating manifest of cargo-example-0.1.1 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 cargo-example-0.1.1 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 cargo-example-0.1.1
[INFO] finished frobbing cargo-example-0.1.1
[INFO] frobbed toml for cargo-example-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-example/0.1.1/Cargo.toml
[INFO] started frobbing cargo-example-0.1.1
[INFO] finished frobbing cargo-example-0.1.1
[INFO] frobbed toml for cargo-example-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cargo-example/0.1.1/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cargo-example-0.1.1 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-2/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/cargo-example/0.1.1:/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] ae950b60b903a150c307c862ee52d5dbe2e6be4b3f9bcd40ca80b1b11ac52c7b
[INFO] running `"docker" "start" "-a" "ae950b60b903a150c307c862ee52d5dbe2e6be4b3f9bcd40ca80b1b11ac52c7b"`
[INFO] [stderr]    Compiling cargo-example v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let mut cache_path: Option<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 13.11s
[INFO] running `"docker" "inspect" "ae950b60b903a150c307c862ee52d5dbe2e6be4b3f9bcd40ca80b1b11ac52c7b"`
[INFO] running `"docker" "rm" "-f" "ae950b60b903a150c307c862ee52d5dbe2e6be4b3f9bcd40ca80b1b11ac52c7b"`
[INFO] [stdout] ae950b60b903a150c307c862ee52d5dbe2e6be4b3f9bcd40ca80b1b11ac52c7b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/cargo-example/0.1.1:/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] aac8caa5b38b9309ec2e942897f4cce5629ed805d82b2f2627cc4dc15734af86
[INFO] running `"docker" "start" "-a" "aac8caa5b38b9309ec2e942897f4cce5629ed805d82b2f2627cc4dc15734af86"`
[INFO] [stderr]    Compiling cargo-example v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let mut cache_path: Option<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 2.08s
[INFO] running `"docker" "inspect" "aac8caa5b38b9309ec2e942897f4cce5629ed805d82b2f2627cc4dc15734af86"`
[INFO] running `"docker" "rm" "-f" "aac8caa5b38b9309ec2e942897f4cce5629ed805d82b2f2627cc4dc15734af86"`
[INFO] [stdout] aac8caa5b38b9309ec2e942897f4cce5629ed805d82b2f2627cc4dc15734af86
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/cargo-example/0.1.1:/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"`
[INFO] [stdout] b02ff199f546aac3034b2d4c2c3c0e345bd3877e83e12f23ae69cf24333a71a1
[INFO] running `"docker" "start" "-a" "b02ff199f546aac3034b2d4c2c3c0e345bd3877e83e12f23ae69cf24333a71a1"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.23s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cargo_example-a03119f5f4485633
[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" "b02ff199f546aac3034b2d4c2c3c0e345bd3877e83e12f23ae69cf24333a71a1"`
[INFO] running `"docker" "rm" "-f" "b02ff199f546aac3034b2d4c2c3c0e345bd3877e83e12f23ae69cf24333a71a1"`
[INFO] [stdout] b02ff199f546aac3034b2d4c2c3c0e345bd3877e83e12f23ae69cf24333a71a1