[INFO] updating cached repository k-ddev/freqs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/k-ddev/freqs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/k-ddev/freqs" "work/ex/beta-1.38-1/sources/1.37.0/gh/k-ddev/freqs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/k-ddev/freqs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/k-ddev/freqs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-ddev/freqs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-ddev/freqs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 036e455e5dd61512d44f6b71cdacaccf2eedc352
[INFO] sha for GitHub repo k-ddev/freqs: 036e455e5dd61512d44f6b71cdacaccf2eedc352
[INFO] validating manifest of k-ddev/freqs 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 k-ddev/freqs 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 k-ddev/freqs
[INFO] finished frobbing k-ddev/freqs
[INFO] frobbed toml for k-ddev/freqs written to work/ex/beta-1.38-1/sources/1.37.0/gh/k-ddev/freqs/Cargo.toml
[INFO] started frobbing k-ddev/freqs
[INFO] finished frobbing k-ddev/freqs
[INFO] frobbed toml for k-ddev/freqs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-ddev/freqs/Cargo.toml
[INFO] crate k-ddev/freqs 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] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/k-ddev/freqs/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing k-ddev/freqs 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/k-ddev/freqs:/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] 6766478de0dc6e87a608f38bb888bfea8ea5518bd27c4c6dc9a1a3a13c035afd
[INFO] running `"docker" "start" "-a" "6766478de0dc6e87a608f38bb888bfea8ea5518bd27c4c6dc9a1a3a13c035afd"`
[INFO] [stderr]    Compiling freqs v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:96:17
[INFO] [stderr]    |
[INFO] [stderr] 96 |                 stdout().flush();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `"docker" "inspect" "6766478de0dc6e87a608f38bb888bfea8ea5518bd27c4c6dc9a1a3a13c035afd"`
[INFO] running `"docker" "rm" "-f" "6766478de0dc6e87a608f38bb888bfea8ea5518bd27c4c6dc9a1a3a13c035afd"`
[INFO] [stdout] 6766478de0dc6e87a608f38bb888bfea8ea5518bd27c4c6dc9a1a3a13c035afd
[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/k-ddev/freqs:/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] 06790f2ea7ab34216cbf8811e6ac24e698ef9e8f975802958f5b76cbfb5806af
[INFO] running `"docker" "start" "-a" "06790f2ea7ab34216cbf8811e6ac24e698ef9e8f975802958f5b76cbfb5806af"`
[INFO] [stderr]    Compiling freqs v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:96:17
[INFO] [stderr]    |
[INFO] [stderr] 96 |                 stdout().flush();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `"docker" "inspect" "06790f2ea7ab34216cbf8811e6ac24e698ef9e8f975802958f5b76cbfb5806af"`
[INFO] running `"docker" "rm" "-f" "06790f2ea7ab34216cbf8811e6ac24e698ef9e8f975802958f5b76cbfb5806af"`
[INFO] [stdout] 06790f2ea7ab34216cbf8811e6ac24e698ef9e8f975802958f5b76cbfb5806af
[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/k-ddev/freqs:/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] c2930ce2beb695be377da313cd0692e9ba11f57524e541ccbc217675971308e6
[INFO] running `"docker" "start" "-a" "c2930ce2beb695be377da313cd0692e9ba11f57524e541ccbc217675971308e6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/freqs-ea23ddf7ccfffa71
[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" "c2930ce2beb695be377da313cd0692e9ba11f57524e541ccbc217675971308e6"`
[INFO] running `"docker" "rm" "-f" "c2930ce2beb695be377da313cd0692e9ba11f57524e541ccbc217675971308e6"`
[INFO] [stdout] c2930ce2beb695be377da313cd0692e9ba11f57524e541ccbc217675971308e6