[INFO] cloning repository https://github.com/codingJourneyFromUnemployment/rust_learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/codingJourneyFromUnemployment/rust_learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcodingJourneyFromUnemployment%2Frust_learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcodingJourneyFromUnemployment%2Frust_learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 19b60fcd61b67c2bf4875064425690c28325d818
[INFO] checking codingJourneyFromUnemployment/rust_learn against try#987a165cfab916796a8315782b83ac460a651ce2 for pr-145262
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FcodingJourneyFromUnemployment%2Frust_learn" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/codingJourneyFromUnemployment/rust_learn
[INFO] finished tweaking git repo https://github.com/codingJourneyFromUnemployment/rust_learn
[INFO] tweaked toml for git repo https://github.com/codingJourneyFromUnemployment/rust_learn written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/codingJourneyFromUnemployment/rust_learn on toolchain 987a165cfab916796a8315782b83ac460a651ce2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+987a165cfab916796a8315782b83ac460a651ce2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/codingJourneyFromUnemployment/rust_learn 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" "+987a165cfab916796a8315782b83ac460a651ce2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+987a165cfab916796a8315782b83ac460a651ce2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3cdd76002e5d0fdbabb6d236240776203e0f9da6e4921d332574dd01f1596d9
[INFO] running `Command { std: "docker" "start" "-a" "f3cdd76002e5d0fdbabb6d236240776203e0f9da6e4921d332574dd01f1596d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3cdd76002e5d0fdbabb6d236240776203e0f9da6e4921d332574dd01f1596d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3cdd76002e5d0fdbabb6d236240776203e0f9da6e4921d332574dd01f1596d9", kill_on_drop: false }`
[INFO] [stdout] f3cdd76002e5d0fdbabb6d236240776203e0f9da6e4921d332574dd01f1596d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+987a165cfab916796a8315782b83ac460a651ce2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 75eda8df5a74750c6d097b83ff184914ed93b44950d618271546085454c1a78b
[INFO] running `Command { std: "docker" "start" "-a" "75eda8df5a74750c6d097b83ff184914ed93b44950d618271546085454c1a78b", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0601]: `main` function not found in crate `variable_binding`
[INFO] [stdout]   --> src/bin/variable_binding.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 47 | // }
[INFO] [stdout]    |     ^ consider adding a `main` function to `src/bin/variable_binding.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/gramma.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 |   let mut c = 30i32;
[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/bin/gramma.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 |   let mut c = 30i32;
[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] [stderr] error: could not compile `rust_learn` (bin "variable_binding") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "75eda8df5a74750c6d097b83ff184914ed93b44950d618271546085454c1a78b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75eda8df5a74750c6d097b83ff184914ed93b44950d618271546085454c1a78b", kill_on_drop: false }`
[INFO] [stdout] 75eda8df5a74750c6d097b83ff184914ed93b44950d618271546085454c1a78b