[INFO] cloning repository https://github.com/NikitaSmall/rust_rpn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NikitaSmall/rust_rpn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNikitaSmall%2Frust_rpn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNikitaSmall%2Frust_rpn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 34a83739d911b80bb25319db4149fbd4084660a3
[INFO] checking NikitaSmall/rust_rpn against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNikitaSmall%2Frust_rpn" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NikitaSmall/rust_rpn on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NikitaSmall/rust_rpn
[INFO] finished tweaking git repo https://github.com/NikitaSmall/rust_rpn
[INFO] tweaked toml for git repo https://github.com/NikitaSmall/rust_rpn written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/NikitaSmall/rust_rpn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 98fed150480b237a42ad2f1a469fcf1298498ea0b2ea16c09ad18bc7f034625f
[INFO] running `Command { std: "docker" "start" "-a" "98fed150480b237a42ad2f1a469fcf1298498ea0b2ea16c09ad18bc7f034625f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98fed150480b237a42ad2f1a469fcf1298498ea0b2ea16c09ad18bc7f034625f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98fed150480b237a42ad2f1a469fcf1298498ea0b2ea16c09ad18bc7f034625f", kill_on_drop: false }`
[INFO] [stdout] 98fed150480b237a42ad2f1a469fcf1298498ea0b2ea16c09ad18bc7f034625f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69e651e7391a9b1f9bc757604b8193b45033c0c2ff22f757eaa8708338aba695
[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" "69e651e7391a9b1f9bc757604b8193b45033c0c2ff22f757eaa8708338aba695", kill_on_drop: false }`
[INFO] [stderr]     Checking rpn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/converter.rs:95:13
[INFO] [stdout]    |
[INFO] [stdout] 95 |         let mut converter = Converter::convert(example_string);
[INFO] [stdout]    |             ----^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/converter.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut converter = Converter::convert(example_string);
[INFO] [stdout]     |             ----^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `raw`
[INFO] [stdout]   --> src/converter.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     raw: String,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `prededence`
[INFO] [stdout]   --> src/converter.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     prededence: HashMap<Stackable, i8>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `convert`
[INFO] [stdout]   --> src/converter.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn convert(raw: String) -> Converter {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `process`
[INFO] [stdout]   --> src/converter.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn process(&mut self) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `Command { std: "docker" "inspect" "69e651e7391a9b1f9bc757604b8193b45033c0c2ff22f757eaa8708338aba695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69e651e7391a9b1f9bc757604b8193b45033c0c2ff22f757eaa8708338aba695", kill_on_drop: false }`
[INFO] [stdout] 69e651e7391a9b1f9bc757604b8193b45033c0c2ff22f757eaa8708338aba695