[INFO] updating cached repository ccqpein/random_choice
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ccqpein/random_choice
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ccqpein/random_choice" "work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ccqpein/random_choice" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ccqpein/random_choice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ccqpein/random_choice'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8b223064ca792feed5217b86dc4d3281a05ba75c
[INFO] sha for GitHub repo ccqpein/random_choice: 8b223064ca792feed5217b86dc4d3281a05ba75c
[INFO] validating manifest of ccqpein/random_choice 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 ccqpein/random_choice 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 ccqpein/random_choice
[INFO] finished frobbing ccqpein/random_choice
[INFO] frobbed toml for ccqpein/random_choice written to work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice/Cargo.toml
[INFO] started frobbing ccqpein/random_choice
[INFO] finished frobbing ccqpein/random_choice
[INFO] frobbed toml for ccqpein/random_choice written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ccqpein/random_choice/Cargo.toml
[INFO] crate ccqpein/random_choice already has a lockfile, it will not be regenerated
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing ccqpein/random_choice 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice:/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] c6fab3726ae5e89a15a09278d5a8b99b2f75db5a2f75c3457642117787d2d976
[INFO] running `"docker" "start" "-a" "c6fab3726ae5e89a15a09278d5a8b99b2f75db5a2f75c3457642117787d2d976"`
[INFO] [stderr]    Compiling serde v1.0.56
[INFO] [stderr]    Compiling serde_derive v1.0.56
[INFO] [stderr]    Compiling serde_json v1.0.17
[INFO] [stderr]    Compiling random_choice v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]   --> src/lib.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::collections::HashMap;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.89s
[INFO] running `"docker" "inspect" "c6fab3726ae5e89a15a09278d5a8b99b2f75db5a2f75c3457642117787d2d976"`
[INFO] running `"docker" "rm" "-f" "c6fab3726ae5e89a15a09278d5a8b99b2f75db5a2f75c3457642117787d2d976"`
[INFO] [stdout] c6fab3726ae5e89a15a09278d5a8b99b2f75db5a2f75c3457642117787d2d976
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice:/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] 478efcb385eabbc8ab44907a2f394d3b1f633f9cae05229c38770074052c8b76
[INFO] running `"docker" "start" "-a" "478efcb385eabbc8ab44907a2f394d3b1f633f9cae05229c38770074052c8b76"`
[INFO] [stderr]    Compiling random_choice v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]   --> src/lib.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::collections::HashMap;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `"docker" "inspect" "478efcb385eabbc8ab44907a2f394d3b1f633f9cae05229c38770074052c8b76"`
[INFO] running `"docker" "rm" "-f" "478efcb385eabbc8ab44907a2f394d3b1f633f9cae05229c38770074052c8b76"`
[INFO] [stdout] 478efcb385eabbc8ab44907a2f394d3b1f633f9cae05229c38770074052c8b76
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ccqpein/random_choice:/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] 982e00ca43ef57f5d1f08f0545d577b693f6a138afcc4082ab0a753bc06dd9e3
[INFO] running `"docker" "start" "-a" "982e00ca43ef57f5d1f08f0545d577b693f6a138afcc4082ab0a753bc06dd9e3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/random_choice-eaa6d812885170b5
[INFO] [stderr]      Running /opt/crater/target/debug/deps/random_choice-0aafe456c8e6a33e
[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] [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] [stderr]    Doc-tests random_choice
[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" "982e00ca43ef57f5d1f08f0545d577b693f6a138afcc4082ab0a753bc06dd9e3"`
[INFO] running `"docker" "rm" "-f" "982e00ca43ef57f5d1f08f0545d577b693f6a138afcc4082ab0a753bc06dd9e3"`
[INFO] [stdout] 982e00ca43ef57f5d1f08f0545d577b693f6a138afcc4082ab0a753bc06dd9e3