[INFO] updating cached repository slayerjain/cs4414-ps2
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/slayerjain/cs4414-ps2
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/slayerjain/cs4414-ps2" "work/ex/beta-1.38-1/sources/1.37.0/gh/slayerjain/cs4414-ps2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/slayerjain/cs4414-ps2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/slayerjain/cs4414-ps2" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 614533a90b9932c15597aab23e6c6fe64d6b7b3a
[INFO] sha for GitHub repo slayerjain/cs4414-ps2: 614533a90b9932c15597aab23e6c6fe64d6b7b3a
[INFO] validating manifest of slayerjain/cs4414-ps2 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 slayerjain/cs4414-ps2 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 slayerjain/cs4414-ps2
[INFO] finished frobbing slayerjain/cs4414-ps2
[INFO] frobbed toml for slayerjain/cs4414-ps2 written to work/ex/beta-1.38-1/sources/1.37.0/gh/slayerjain/cs4414-ps2/Cargo.toml
[INFO] started frobbing slayerjain/cs4414-ps2
[INFO] finished frobbing slayerjain/cs4414-ps2
[INFO] frobbed toml for slayerjain/cs4414-ps2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2/Cargo.toml
[INFO] crate slayerjain/cs4414-ps2 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/slayerjain/cs4414-ps2/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[INFO] the lockfile is outdated, regenerating it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] testing slayerjain/cs4414-ps2 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-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2:/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] fd9e6aa97266d7e79005af531c83509b7f12a986057b0486e6b4180b72a179a0
[INFO] running `"docker" "start" "-a" "fd9e6aa97266d7e79005af531c83509b7f12a986057b0486e6b4180b72a179a0"`
[INFO] [stderr]    Compiling ps2 v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |         let mut stdin = io::stdin();
[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 0.87s
[INFO] running `"docker" "inspect" "fd9e6aa97266d7e79005af531c83509b7f12a986057b0486e6b4180b72a179a0"`
[INFO] running `"docker" "rm" "-f" "fd9e6aa97266d7e79005af531c83509b7f12a986057b0486e6b4180b72a179a0"`
[INFO] [stdout] fd9e6aa97266d7e79005af531c83509b7f12a986057b0486e6b4180b72a179a0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2:/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] 623492226f68d83bb42a9eb776287361790d4ca88a3df4358e1ed33e6ee1b2db
[INFO] running `"docker" "start" "-a" "623492226f68d83bb42a9eb776287361790d4ca88a3df4358e1ed33e6ee1b2db"`
[INFO] [stderr]    Compiling ps2 v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:13
[INFO] [stderr]    |
[INFO] [stderr] 29 |         let mut stdin = io::stdin();
[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 0.40s
[INFO] running `"docker" "inspect" "623492226f68d83bb42a9eb776287361790d4ca88a3df4358e1ed33e6ee1b2db"`
[INFO] running `"docker" "rm" "-f" "623492226f68d83bb42a9eb776287361790d4ca88a3df4358e1ed33e6ee1b2db"`
[INFO] [stdout] 623492226f68d83bb42a9eb776287361790d4ca88a3df4358e1ed33e6ee1b2db
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/slayerjain/cs4414-ps2:/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] 84962560b6412f14088e05b14a0622f9f9b40791a3d534a74d8a406bc8015a2f
[INFO] running `"docker" "start" "-a" "84962560b6412f14088e05b14a0622f9f9b40791a3d534a74d8a406bc8015a2f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ps2-5f386dd718be5378
[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" "84962560b6412f14088e05b14a0622f9f9b40791a3d534a74d8a406bc8015a2f"`
[INFO] running `"docker" "rm" "-f" "84962560b6412f14088e05b14a0622f9f9b40791a3d534a74d8a406bc8015a2f"`
[INFO] [stdout] 84962560b6412f14088e05b14a0622f9f9b40791a3d534a74d8a406bc8015a2f