[INFO] updating cached repository agraven/rusty-calculator
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/agraven/rusty-calculator
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/agraven/rusty-calculator" "work/ex/beta-1.38-1/sources/1.37.0/gh/agraven/rusty-calculator"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/agraven/rusty-calculator'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/agraven/rusty-calculator" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/agraven/rusty-calculator"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/agraven/rusty-calculator'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8329b708e3a69571730be9386e830f969bb7e838
[INFO] sha for GitHub repo agraven/rusty-calculator: 8329b708e3a69571730be9386e830f969bb7e838
[INFO] validating manifest of agraven/rusty-calculator 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 agraven/rusty-calculator 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 agraven/rusty-calculator
[INFO] finished frobbing agraven/rusty-calculator
[INFO] frobbed toml for agraven/rusty-calculator written to work/ex/beta-1.38-1/sources/1.37.0/gh/agraven/rusty-calculator/Cargo.toml
[INFO] started frobbing agraven/rusty-calculator
[INFO] finished frobbing agraven/rusty-calculator
[INFO] frobbed toml for agraven/rusty-calculator written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/agraven/rusty-calculator/Cargo.toml
[INFO] crate agraven/rusty-calculator 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 agraven/rusty-calculator 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/agraven/rusty-calculator:/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] 3c8a6877f773c523b7085b35ea21e16ee2c10766ed83ff7163f423c6a181c689
[INFO] running `"docker" "start" "-a" "3c8a6877f773c523b7085b35ea21e16ee2c10766ed83ff7163f423c6a181c689"`
[INFO] [stderr]    Compiling rusty-calculator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: expected one of `=>`, `if`, or `|`, found `(`
[INFO] [stderr]   --> src/calculate.rs:56:6
[INFO] [stderr]    |
[INFO] [stderr] 56 |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stderr]    |                  ^ expected one of `=>`, `if`, or `|` here
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/calculate.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 |             operations.remove(index);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rusty-calculator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3c8a6877f773c523b7085b35ea21e16ee2c10766ed83ff7163f423c6a181c689"`
[INFO] running `"docker" "rm" "-f" "3c8a6877f773c523b7085b35ea21e16ee2c10766ed83ff7163f423c6a181c689"`
[INFO] [stdout] 3c8a6877f773c523b7085b35ea21e16ee2c10766ed83ff7163f423c6a181c689