[INFO] cloning repository https://github.com/agraven/rusty-calculator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/agraven/rusty-calculator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagraven%2Frusty-calculator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagraven%2Frusty-calculator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8329b708e3a69571730be9386e830f969bb7e838
[INFO] checking agraven/rusty-calculator against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagraven%2Frusty-calculator" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/agraven/rusty-calculator on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-4/source/Cargo.toml
[INFO] crate git repo https://github.com/agraven/rusty-calculator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 89938e8fbbddd3af35b1c316d045908e0186c60d4514ed8502668dff0e16fa6d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "89938e8fbbddd3af35b1c316d045908e0186c60d4514ed8502668dff0e16fa6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "89938e8fbbddd3af35b1c316d045908e0186c60d4514ed8502668dff0e16fa6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89938e8fbbddd3af35b1c316d045908e0186c60d4514ed8502668dff0e16fa6d", kill_on_drop: false }`
[INFO] [stdout] 89938e8fbbddd3af35b1c316d045908e0186c60d4514ed8502668dff0e16fa6d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b83ec88e5340cd6a8de3259edf19406d496afa76941791fa21c5c68fce53a6f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7b83ec88e5340cd6a8de3259edf19406d496afa76941791fa21c5c68fce53a6f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rusty-calculator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `=>`, `if`, or `|`, found `(`
[INFO] [stdout]   --> src/calculate.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stdout]    |                  ^ expected one of `=>`, `if`, or `|`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected one of `=>`, `if`, or `|`, found `(`
[INFO] [stdout]   --> src/calculate.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stdout]    |                  ^ expected one of `=>`, `if`, or `|`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty-calculator`
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/calculate.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 55 |               match operations[index-1] {
[INFO] [stdout]    |  _____________-
[INFO] [stdout] 56 | |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stdout] 57 | |                 /*Add(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stdout] 58 | |                 Subtract(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stdout] ...  |
[INFO] [stdout] 62 | |                 _ => return Err("Operation not implemented yet"),
[INFO] [stdout] 63 | |             }
[INFO] [stdout]    | |_____________- any code following this expression is unreachable
[INFO] [stdout] 64 |               operations.remove(index);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/calculate.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 55 |               match operations[index-1] {
[INFO] [stdout]    |  _____________-
[INFO] [stdout] 56 | |                 _(ref mut prev_val: f64) => *prev_val = prev_val.powf(val),
[INFO] [stdout] 57 | |                 /*Add(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stdout] 58 | |                 Subtract(ref mut prev_val) => *prev_val = prev_val.powf(val),
[INFO] [stdout] ...  |
[INFO] [stdout] 62 | |                 _ => return Err("Operation not implemented yet"),
[INFO] [stdout] 63 | |             }
[INFO] [stdout]    | |_____________- any code following this expression is unreachable
[INFO] [stdout] 64 |               operations.remove(index);
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "7b83ec88e5340cd6a8de3259edf19406d496afa76941791fa21c5c68fce53a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b83ec88e5340cd6a8de3259edf19406d496afa76941791fa21c5c68fce53a6f", kill_on_drop: false }`
[INFO] [stdout] 7b83ec88e5340cd6a8de3259edf19406d496afa76941791fa21c5c68fce53a6f