[INFO] updating cached repository willsalz/inverted_index
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/willsalz/inverted_index
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/willsalz/inverted_index" "work/ex/beta-1.38-1/sources/1.37.0/gh/willsalz/inverted_index"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/willsalz/inverted_index'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/willsalz/inverted_index" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willsalz/inverted_index"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willsalz/inverted_index'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fb03bc52766dbfef6bd4ab5a856a639429a37c4a
[INFO] sha for GitHub repo willsalz/inverted_index: fb03bc52766dbfef6bd4ab5a856a639429a37c4a
[INFO] validating manifest of willsalz/inverted_index 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 willsalz/inverted_index 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 willsalz/inverted_index
[INFO] finished frobbing willsalz/inverted_index
[INFO] frobbed toml for willsalz/inverted_index written to work/ex/beta-1.38-1/sources/1.37.0/gh/willsalz/inverted_index/Cargo.toml
[INFO] started frobbing willsalz/inverted_index
[INFO] finished frobbing willsalz/inverted_index
[INFO] frobbed toml for willsalz/inverted_index written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willsalz/inverted_index/Cargo.toml
[INFO] crate willsalz/inverted_index 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] testing willsalz/inverted_index 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/gh/willsalz/inverted_index:/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] 174799ff3aed125a42a5b30948c559534fcc5f5ff9042442a2874404934b9dd2
[INFO] running `"docker" "start" "-a" "174799ff3aed125a42a5b30948c559534fcc5f5ff9042442a2874404934b9dd2"`
[INFO] [stderr]    Compiling libc v0.2.18
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling inverted_index v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |         for (_, mut posting_list) in &mut self.index {
[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 4.99s
[INFO] running `"docker" "inspect" "174799ff3aed125a42a5b30948c559534fcc5f5ff9042442a2874404934b9dd2"`
[INFO] running `"docker" "rm" "-f" "174799ff3aed125a42a5b30948c559534fcc5f5ff9042442a2874404934b9dd2"`
[INFO] [stdout] 174799ff3aed125a42a5b30948c559534fcc5f5ff9042442a2874404934b9dd2
[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/gh/willsalz/inverted_index:/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] e2782d990a2117c9dd28a373fffa1254e515728839b334c43b67a829e9e5ddc8
[INFO] running `"docker" "start" "-a" "e2782d990a2117c9dd28a373fffa1254e515728839b334c43b67a829e9e5ddc8"`
[INFO] [stderr]    Compiling inverted_index v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:55:17
[INFO] [stderr]    |
[INFO] [stderr] 55 |         for (_, mut posting_list) in &mut self.index {
[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 1.50s
[INFO] running `"docker" "inspect" "e2782d990a2117c9dd28a373fffa1254e515728839b334c43b67a829e9e5ddc8"`
[INFO] running `"docker" "rm" "-f" "e2782d990a2117c9dd28a373fffa1254e515728839b334c43b67a829e9e5ddc8"`
[INFO] [stdout] e2782d990a2117c9dd28a373fffa1254e515728839b334c43b67a829e9e5ddc8
[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/gh/willsalz/inverted_index:/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] 2ec89242d56fbc09fa8d821a7267e54ba12515c11aa7b23ae6b4b392f865579b
[INFO] running `"docker" "start" "-a" "2ec89242d56fbc09fa8d821a7267e54ba12515c11aa7b23ae6b4b392f865579b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/inverted_index-5c07403c720b8c4d
[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]      Running /opt/crater/target/debug/deps/inverted_index-4f6537df8c3663c6
[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]      Running /opt/crater/target/debug/deps/test_index-eab42709725a7414
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_index_document ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests inverted_index
[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" "2ec89242d56fbc09fa8d821a7267e54ba12515c11aa7b23ae6b4b392f865579b"`
[INFO] running `"docker" "rm" "-f" "2ec89242d56fbc09fa8d821a7267e54ba12515c11aa7b23ae6b4b392f865579b"`
[INFO] [stdout] 2ec89242d56fbc09fa8d821a7267e54ba12515c11aa7b23ae6b4b392f865579b