[INFO] cloning repository https://github.com/ujjwal3067/MapReduce_Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ujjwal3067/MapReduce_Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fujjwal3067%2FMapReduce_Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fujjwal3067%2FMapReduce_Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 725adb18388434c263f3272c647149975cea85cf
[INFO] checking ujjwal3067/MapReduce_Rust against try#438eb4c1a1c3841523d7f672601e8adbe04cff28 for pr-147589-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fujjwal3067%2FMapReduce_Rust" "/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/ujjwal3067/MapReduce_Rust
[INFO] finished tweaking git repo https://github.com/ujjwal3067/MapReduce_Rust
[INFO] tweaked toml for git repo https://github.com/ujjwal3067/MapReduce_Rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ujjwal3067/MapReduce_Rust on toolchain 438eb4c1a1c3841523d7f672601e8adbe04cff28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ujjwal3067/MapReduce_Rust 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" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded predicates v2.1.1
[INFO] [stderr]   Downloaded predicates-core v1.0.3
[INFO] [stderr]   Downloaded assert_cmd v2.0.4
[INFO] [stderr]   Downloaded predicates-tree v1.0.5
[INFO] [stderr]   Downloaded ctor v0.1.22
[INFO] [stderr]   Downloaded termtree v0.2.4
[INFO] [stderr]   Downloaded pretty_assertions v1.2.1
[INFO] [stderr]   Downloaded syn v1.0.95
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb5af77dd27555c7f606a0559079d934a872bbca74b92943223292e98111f9db
[INFO] running `Command { std: "docker" "start" "-a" "eb5af77dd27555c7f606a0559079d934a872bbca74b92943223292e98111f9db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb5af77dd27555c7f606a0559079d934a872bbca74b92943223292e98111f9db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb5af77dd27555c7f606a0559079d934a872bbca74b92943223292e98111f9db", kill_on_drop: false }`
[INFO] [stdout] eb5af77dd27555c7f606a0559079d934a872bbca74b92943223292e98111f9db
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23d60e385ff45471fcdc07e89c2bc2189ff56cd0234e4b1d6713a0a084764cdf
[INFO] running `Command { std: "docker" "start" "-a" "23d60e385ff45471fcdc07e89c2bc2189ff56cd0234e4b1d6713a0a084764cdf", kill_on_drop: false }`
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]     Checking pretty_assertions v1.2.1
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking predicates v2.1.1
[INFO] [stderr]     Checking assert_cmd v2.0.4
[INFO] [stderr]     Checking mapreduce v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |         self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let _ = self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 131 |         let _ = self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `mapreduce`
[INFO] [stdout]   --> src/main.rs:62:2
[INFO] [stdout]    |
[INFO] [stdout] 62 | }
[INFO] [stdout]    |  ^ consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |         self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let _ = self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 131 |         let _ = self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mapreduce` (bin "mapreduce") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |         self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let _ = self.sender.send(Message::NewJob(JobsType::Mapper(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/threadpool/pool.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |         self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 131 |         let _ = self.sender.send(Message::NewJob(JobsType::Reducer(job)));
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "23d60e385ff45471fcdc07e89c2bc2189ff56cd0234e4b1d6713a0a084764cdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23d60e385ff45471fcdc07e89c2bc2189ff56cd0234e4b1d6713a0a084764cdf", kill_on_drop: false }`
[INFO] [stdout] 23d60e385ff45471fcdc07e89c2bc2189ff56cd0234e4b1d6713a0a084764cdf