[INFO] updating cached repository naotaco/dff
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/naotaco/dff
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/naotaco/dff" "work/ex/beta-1.38-1/sources/1.37.0/gh/naotaco/dff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/naotaco/dff'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/naotaco/dff" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/naotaco/dff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/naotaco/dff'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0bc3712bcfc6f052fdd7cb4f5f24cdbbf1a4f236
[INFO] sha for GitHub repo naotaco/dff: 0bc3712bcfc6f052fdd7cb4f5f24cdbbf1a4f236
[INFO] validating manifest of naotaco/dff 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 naotaco/dff 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 naotaco/dff
[INFO] finished frobbing naotaco/dff
[INFO] frobbed toml for naotaco/dff written to work/ex/beta-1.38-1/sources/1.37.0/gh/naotaco/dff/Cargo.toml
[INFO] started frobbing naotaco/dff
[INFO] finished frobbing naotaco/dff
[INFO] frobbed toml for naotaco/dff written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/naotaco/dff/Cargo.toml
[INFO] crate naotaco/dff 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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing naotaco/dff 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/naotaco/dff:/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] f01026db09046cd0e8611ee2afd6764572ab254bc50c7e1f4cd319819acc61e0
[INFO] running `"docker" "start" "-a" "f01026db09046cd0e8611ee2afd6764572ab254bc50c7e1f4cd319819acc61e0"`
[INFO] [stderr]    Compiling dff v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::hash_map::Entry`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::hash_map::Entry;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/main.rs:41:15
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    |               ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/main.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    |                           ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_similar`
[INFO] [stderr]   --> src/main.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `"docker" "inspect" "f01026db09046cd0e8611ee2afd6764572ab254bc50c7e1f4cd319819acc61e0"`
[INFO] running `"docker" "rm" "-f" "f01026db09046cd0e8611ee2afd6764572ab254bc50c7e1f4cd319819acc61e0"`
[INFO] [stdout] f01026db09046cd0e8611ee2afd6764572ab254bc50c7e1f4cd319819acc61e0
[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/naotaco/dff:/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] 53d3345c4fc6760714f82d605bc89cb31be18c7d967f2908204496275673e895
[INFO] running `"docker" "start" "-a" "53d3345c4fc6760714f82d605bc89cb31be18c7d967f2908204496275673e895"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling dff v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::collections::hash_map::Entry`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::hash_map::Entry;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/main.rs:41:15
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    |               ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/main.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    |                           ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_similar`
[INFO] [stderr]   --> src/main.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn is_similar(a: &String, b: &String) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `"docker" "inspect" "53d3345c4fc6760714f82d605bc89cb31be18c7d967f2908204496275673e895"`
[INFO] running `"docker" "rm" "-f" "53d3345c4fc6760714f82d605bc89cb31be18c7d967f2908204496275673e895"`
[INFO] [stdout] 53d3345c4fc6760714f82d605bc89cb31be18c7d967f2908204496275673e895
[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/naotaco/dff:/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] 3d607d658b9551e4a5091d831498890249cc7c458b9c310cf4a00afef3ad78a2
[INFO] running `"docker" "start" "-a" "3d607d658b9551e4a5091d831498890249cc7c458b9c310cf4a00afef3ad78a2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/dff-86c2d13b1cbf80c5
[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" "3d607d658b9551e4a5091d831498890249cc7c458b9c310cf4a00afef3ad78a2"`
[INFO] running `"docker" "rm" "-f" "3d607d658b9551e4a5091d831498890249cc7c458b9c310cf4a00afef3ad78a2"`
[INFO] [stdout] 3d607d658b9551e4a5091d831498890249cc7c458b9c310cf4a00afef3ad78a2