[INFO] updating cached repository jeisux92/rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jeisux92/rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jeisux92/rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/jeisux92/rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jeisux92/rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jeisux92/rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeisux92/rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeisux92/rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6feb1542a19b3e219b9208ee782e22e259b328cc
[INFO] sha for GitHub repo jeisux92/rust: 6feb1542a19b3e219b9208ee782e22e259b328cc
[INFO] validating manifest of jeisux92/rust 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 jeisux92/rust 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 jeisux92/rust
[INFO] finished frobbing jeisux92/rust
[INFO] frobbed toml for jeisux92/rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/jeisux92/rust/Cargo.toml
[INFO] started frobbing jeisux92/rust
[INFO] finished frobbing jeisux92/rust
[INFO] frobbed toml for jeisux92/rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeisux92/rust/Cargo.toml
[INFO] crate jeisux92/rust 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing jeisux92/rust 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/jeisux92/rust:/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] 2847a624eebafa6a163f58e217a00af755595371143588f448d8f102eb002d6d
[INFO] running `"docker" "start" "-a" "2847a624eebafa6a163f58e217a00af755595371143588f448d8f102eb002d6d"`
[INFO] [stderr]    Compiling rust-hello v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
[INFO] [stderr]   --> src/main.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let world = first_word(&s);
[INFO] [stderr]    |                            -- immutable borrow occurs here
[INFO] [stderr] 35 |     s.clear();
[INFO] [stderr]    |     ^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 36 | 
[INFO] [stderr] 37 |     println!("{}", world);
[INFO] [stderr]    |                    ----- immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0502`.
[INFO] [stderr] error: Could not compile `rust-hello`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2847a624eebafa6a163f58e217a00af755595371143588f448d8f102eb002d6d"`
[INFO] running `"docker" "rm" "-f" "2847a624eebafa6a163f58e217a00af755595371143588f448d8f102eb002d6d"`
[INFO] [stdout] 2847a624eebafa6a163f58e217a00af755595371143588f448d8f102eb002d6d