[INFO] cloning repository https://github.com/t-eckert/rpn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/t-eckert/rpn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft-eckert%2Frpn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft-eckert%2Frpn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b3a25f61ae1ea7368929240d5ad199ba9e06ddb8
[INFO] testing t-eckert/rpn against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft-eckert%2Frpn" "/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/t-eckert/rpn on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/t-eckert/rpn
[INFO] finished tweaking git repo https://github.com/t-eckert/rpn
[INFO] tweaked toml for git repo https://github.com/t-eckert/rpn written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/t-eckert/rpn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5a27fbeb1bd05f7d716a63290585c1d67bf14ec7a9dec6f0001b21aa891679b
[INFO] running `Command { std: "docker" "start" "-a" "b5a27fbeb1bd05f7d716a63290585c1d67bf14ec7a9dec6f0001b21aa891679b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5a27fbeb1bd05f7d716a63290585c1d67bf14ec7a9dec6f0001b21aa891679b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5a27fbeb1bd05f7d716a63290585c1d67bf14ec7a9dec6f0001b21aa891679b", kill_on_drop: false }`
[INFO] [stdout] b5a27fbeb1bd05f7d716a63290585c1d67bf14ec7a9dec6f0001b21aa891679b
[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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 76bdc28a3567b61cd85d31e96a797bcc6358aea31aa9d76da13691243863a3be
[INFO] running `Command { std: "docker" "start" "-a" "76bdc28a3567b61cd85d31e96a797bcc6358aea31aa9d76da13691243863a3be", kill_on_drop: false }`
[INFO] [stderr]    Compiling rpn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/evaluator.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 23 | /             match instruction {
[INFO] [stdout] 24 | |                 "+" => &self.add(),
[INFO] [stdout] 25 | |                 "-" => &self.subtract(),
[INFO] [stdout] 26 | |                 "*" => &self.multiply(),
[INFO] [stdout] ...  |
[INFO] [stdout] 30 | |                     &self.push(value)
[INFO] [stdout]    | |                     ^^^^^^^^^^^^^^^^^ expected `()`, found `&()`
[INFO] [stdout] 31 | |                 }
[INFO] [stdout] 32 | |             }
[INFO] [stdout]    | |_____________- expected this to be `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]    |
[INFO] [stdout] 32 |             };
[INFO] [stdout]    |              +
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 30 -                     &self.push(value)
[INFO] [stdout] 30 +                     self.push(value)
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rpn` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "76bdc28a3567b61cd85d31e96a797bcc6358aea31aa9d76da13691243863a3be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76bdc28a3567b61cd85d31e96a797bcc6358aea31aa9d76da13691243863a3be", kill_on_drop: false }`
[INFO] [stdout] 76bdc28a3567b61cd85d31e96a797bcc6358aea31aa9d76da13691243863a3be