[INFO] updating cached repository cpaulcox/rusty
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cpaulcox/rusty
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cpaulcox/rusty" "work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cpaulcox/rusty" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cpaulcox/rusty"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cpaulcox/rusty'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2a5aa6ef45a2910468b805b5c3fba08585c24942
[INFO] sha for GitHub repo cpaulcox/rusty: 2a5aa6ef45a2910468b805b5c3fba08585c24942
[INFO] validating manifest of cpaulcox/rusty on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cpaulcox/rusty on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cpaulcox/rusty
[INFO] finished frobbing cpaulcox/rusty
[INFO] frobbed toml for cpaulcox/rusty written to work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty/Cargo.toml
[INFO] started frobbing cpaulcox/rusty
[INFO] finished frobbing cpaulcox/rusty
[INFO] frobbed toml for cpaulcox/rusty written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/cpaulcox/rusty/Cargo.toml
[INFO] crate cpaulcox/rusty already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cpaulcox/rusty against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] a5a0db1a47bf10d0e6087ad5781f6dd57158565377573c15b8018e529a1b7bd0
[INFO] running `"docker" "start" "-a" "a5a0db1a47bf10d0e6087ad5781f6dd57158565377573c15b8018e529a1b7bd0"`
[INFO] [stderr]    Compiling memmap v0.7.0
[INFO] [stderr]    Compiling rusty v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/main.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut y = 2;  // mutable
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     y = 4;
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `"docker" "inspect" "a5a0db1a47bf10d0e6087ad5781f6dd57158565377573c15b8018e529a1b7bd0"`
[INFO] running `"docker" "rm" "-f" "a5a0db1a47bf10d0e6087ad5781f6dd57158565377573c15b8018e529a1b7bd0"`
[INFO] [stdout] a5a0db1a47bf10d0e6087ad5781f6dd57158565377573c15b8018e529a1b7bd0
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 889ba11807b985204bfb133bddbd2c2bec9b2c78de95f645593c8408ddbc2e19
[INFO] running `"docker" "start" "-a" "889ba11807b985204bfb133bddbd2c2bec9b2c78de95f645593c8408ddbc2e19"`
[INFO] [stderr]    Compiling rusty v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/main.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let mut y = 2;  // mutable
[INFO] [stderr]    |             ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     y = 4;
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "889ba11807b985204bfb133bddbd2c2bec9b2c78de95f645593c8408ddbc2e19"`
[INFO] running `"docker" "rm" "-f" "889ba11807b985204bfb133bddbd2c2bec9b2c78de95f645593c8408ddbc2e19"`
[INFO] [stdout] 889ba11807b985204bfb133bddbd2c2bec9b2c78de95f645593c8408ddbc2e19
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/cpaulcox/rusty:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] e7913735d0e91c9c6766ae5ee4023fd59caf41d288741fd739f6dae1183ff65e
[INFO] running `"docker" "start" "-a" "e7913735d0e91c9c6766ae5ee4023fd59caf41d288741fd739f6dae1183ff65e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[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/rusty-1510ea54adff730e
[INFO] running `"docker" "inspect" "e7913735d0e91c9c6766ae5ee4023fd59caf41d288741fd739f6dae1183ff65e"`
[INFO] running `"docker" "rm" "-f" "e7913735d0e91c9c6766ae5ee4023fd59caf41d288741fd739f6dae1183ff65e"`
[INFO] [stdout] e7913735d0e91c9c6766ae5ee4023fd59caf41d288741fd739f6dae1183ff65e