[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-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ft-eckert%2Frpn" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/t-eckert/rpn on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-14/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-2021-08-01" "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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15c4a61a849152c1bebeaf1a67af5662650aa75e253392cd5e4acc715f403cfe
[INFO] running `Command { std: "docker" "start" "-a" "15c4a61a849152c1bebeaf1a67af5662650aa75e253392cd5e4acc715f403cfe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15c4a61a849152c1bebeaf1a67af5662650aa75e253392cd5e4acc715f403cfe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15c4a61a849152c1bebeaf1a67af5662650aa75e253392cd5e4acc715f403cfe", kill_on_drop: false }`
[INFO] [stdout] 15c4a61a849152c1bebeaf1a67af5662650aa75e253392cd5e4acc715f403cfe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] af9f9ae77b0c027a8181b79feb74142a3acdddd1ad1d9751de546b4b99ba6aed
[INFO] running `Command { std: "docker" "start" "-a" "af9f9ae77b0c027a8181b79feb74142a3acdddd1ad1d9751de546b4b99ba6aed", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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]    |
[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" "af9f9ae77b0c027a8181b79feb74142a3acdddd1ad1d9751de546b4b99ba6aed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af9f9ae77b0c027a8181b79feb74142a3acdddd1ad1d9751de546b4b99ba6aed", kill_on_drop: false }`
[INFO] [stdout] af9f9ae77b0c027a8181b79feb74142a3acdddd1ad1d9751de546b4b99ba6aed
