[INFO] updating cached repository https://github.com/agraven/rusty-calculator
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8329b708e3a69571730be9386e830f969bb7e838
[INFO] testing agraven/rusty-calculator against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagraven%2Frusty-calculator" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/agraven/rusty-calculator on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/agraven/rusty-calculator
[INFO] finished tweaking git repo https://github.com/agraven/rusty-calculator
[INFO] tweaked toml for git repo https://github.com/agraven/rusty-calculator written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/agraven/rusty-calculator already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7db1b62f01456cdb6e6744892bf5dc0f1bde7fae63975de8e10ffc48c7718137
[INFO] running `"docker" "start" "-a" "7db1b62f01456cdb6e6744892bf5dc0f1bde7fae63975de8e10ffc48c7718137"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rusty-calculator v0.1.0 (/opt/rustwide/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 `|`
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/calculate.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 55 |               match operations[index-1] {
[INFO] [stderr]    |  _____________-
[INFO] [stderr] 56 | |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stderr] 57 | |                 /*Add(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stderr] 58 | |                 Subtract(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stderr] ...  |
[INFO] [stderr] 62 | |                 _ => return Err("Operation not implemented yet"),
[INFO] [stderr] 63 | |             }
[INFO] [stderr]    | |_____________- any code following this expression is unreachable
[INFO] [stderr] 64 |               operations.remove(index);
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[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" "7db1b62f01456cdb6e6744892bf5dc0f1bde7fae63975de8e10ffc48c7718137"`
[INFO] running `"docker" "rm" "-f" "7db1b62f01456cdb6e6744892bf5dc0f1bde7fae63975de8e10ffc48c7718137"`
[INFO] [stdout] 7db1b62f01456cdb6e6744892bf5dc0f1bde7fae63975de8e10ffc48c7718137