[INFO] cloning repository https://github.com/gabucito/rust-closure
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gabucito/rust-closure" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgabucito%2Frust-closure", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgabucito%2Frust-closure'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a43a4e5d1fdb72df56d5f943104605523c979d24
[INFO] checking gabucito/rust-closure against master#fd17deacce374a4185c882795be162e17b557050 for pr-138001
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgabucito%2Frust-closure" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gabucito/rust-closure on toolchain fd17deacce374a4185c882795be162e17b557050
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fd17deacce374a4185c882795be162e17b557050" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gabucito/rust-closure
[INFO] finished tweaking git repo https://github.com/gabucito/rust-closure
[INFO] tweaked toml for git repo https://github.com/gabucito/rust-closure written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gabucito/rust-closure already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fd17deacce374a4185c882795be162e17b557050" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+fd17deacce374a4185c882795be162e17b557050" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 94e164eb83db7bac6826b82063825e74b8116d36b918eed73cb4dd9d9a0dec1d
[INFO] running `Command { std: "docker" "start" "-a" "94e164eb83db7bac6826b82063825e74b8116d36b918eed73cb4dd9d9a0dec1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "94e164eb83db7bac6826b82063825e74b8116d36b918eed73cb4dd9d9a0dec1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94e164eb83db7bac6826b82063825e74b8116d36b918eed73cb4dd9d9a0dec1d", kill_on_drop: false }`
[INFO] [stdout] 94e164eb83db7bac6826b82063825e74b8116d36b918eed73cb4dd9d9a0dec1d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+fd17deacce374a4185c882795be162e17b557050" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 574ad022b5d2cee12cd6b9ea55741b57e952c3b04e638515fe2eda98e7def329
[INFO] running `Command { std: "docker" "start" "-a" "574ad022b5d2cee12cd6b9ea55741b57e952c3b04e638515fe2eda98e7def329", kill_on_drop: false }`
[INFO] [stderr]     Checking excercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | struct Cacher<T>
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 10 |     value: Option<u32>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value` is never used
[INFO] [stdout]   --> src/main.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | / impl<T> Cacher<T>
[INFO] [stdout] 15 | | where
[INFO] [stdout] 16 | |     T: Fn(u32) -> u32,
[INFO] [stdout]    | |______________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |       fn value(&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]   --> src/main.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let v1 = c.hash(1);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 5  | struct Cacher<T>
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 10 |     value: Option<u32>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value` is never used
[INFO] [stdout]   --> src/main.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | / impl<T> Cacher<T>
[INFO] [stdout] 15 | | where
[INFO] [stdout] 16 | |     T: Fn(u32) -> u32,
[INFO] [stdout]    | |______________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |       fn value(&mut self, arg: u32) -> u32 {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "574ad022b5d2cee12cd6b9ea55741b57e952c3b04e638515fe2eda98e7def329", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "574ad022b5d2cee12cd6b9ea55741b57e952c3b04e638515fe2eda98e7def329", kill_on_drop: false }`
[INFO] [stdout] 574ad022b5d2cee12cd6b9ea55741b57e952c3b04e638515fe2eda98e7def329