[INFO] updating cached repository bluecereal/affirmations
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bluecereal/affirmations
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bluecereal/affirmations" "work/ex/beta-1.38-1/sources/1.37.0/gh/bluecereal/affirmations"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bluecereal/affirmations'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bluecereal/affirmations" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bluecereal/affirmations"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bluecereal/affirmations'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 45da44dd7e74a81c210303debf904493f5b11dfc
[INFO] sha for GitHub repo bluecereal/affirmations: 45da44dd7e74a81c210303debf904493f5b11dfc
[INFO] validating manifest of bluecereal/affirmations 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 bluecereal/affirmations 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 bluecereal/affirmations
[INFO] finished frobbing bluecereal/affirmations
[INFO] frobbed toml for bluecereal/affirmations written to work/ex/beta-1.38-1/sources/1.37.0/gh/bluecereal/affirmations/Cargo.toml
[INFO] started frobbing bluecereal/affirmations
[INFO] finished frobbing bluecereal/affirmations
[INFO] frobbed toml for bluecereal/affirmations written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bluecereal/affirmations/Cargo.toml
[INFO] crate bluecereal/affirmations 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 bluecereal/affirmations 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bluecereal/affirmations:/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] 860fc5bd97eb38f5408bcc5e8a6b269d0a98eb1666073b380354611eb0fd9b63
[INFO] running `"docker" "start" "-a" "860fc5bd97eb38f5408bcc5e8a6b269d0a98eb1666073b380354611eb0fd9b63"`
[INFO] [stderr]    Compiling affirmations v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: the type `[std::string::String]` cannot be indexed by `&std::string::String`
[INFO] [stderr]   --> src/main.rs:33:52
[INFO] [stderr]    |
[INFO] [stderr] 33 |             std::io::Write::write(&mut self.store, slice[i]).unwrap();
[INFO] [stderr]    |                                                    ^^^^^^^^ slice indices are of type `usize` or ranges of `usize`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::slice::SliceIndex<[std::string::String]>` is not implemented for `&std::string::String`
[INFO] [stderr]    = note: required because of the requirements on the impl of `std::ops::Index<&std::string::String>` for `[std::string::String]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `affirmations`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "860fc5bd97eb38f5408bcc5e8a6b269d0a98eb1666073b380354611eb0fd9b63"`
[INFO] running `"docker" "rm" "-f" "860fc5bd97eb38f5408bcc5e8a6b269d0a98eb1666073b380354611eb0fd9b63"`
[INFO] [stdout] 860fc5bd97eb38f5408bcc5e8a6b269d0a98eb1666073b380354611eb0fd9b63