[INFO] cloning repository https://github.com/arvaer/mapreduce
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arvaer/mapreduce" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farvaer%2Fmapreduce", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farvaer%2Fmapreduce'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bcf3c14228e7569e241c830b96b14c74ad71ad7d
[INFO] checking arvaer/mapreduce against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farvaer%2Fmapreduce" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arvaer/mapreduce on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arvaer/mapreduce
[INFO] finished tweaking git repo https://github.com/arvaer/mapreduce
[INFO] tweaked toml for git repo https://github.com/arvaer/mapreduce written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/arvaer/mapreduce 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded file-lock v2.1.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e9664216ecd3f2dd2aefd9f606c4c930015c83246c330105cb646132c92e702d
[INFO] running `Command { std: "docker" "start" "-a" "e9664216ecd3f2dd2aefd9f606c4c930015c83246c330105cb646132c92e702d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e9664216ecd3f2dd2aefd9f606c4c930015c83246c330105cb646132c92e702d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9664216ecd3f2dd2aefd9f606c4c930015c83246c330105cb646132c92e702d", kill_on_drop: false }`
[INFO] [stdout] e9664216ecd3f2dd2aefd9f606c4c930015c83246c330105cb646132c92e702d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbe094c8418486120f7fdfe8e238f2da7de0ff9f0daaa6639c1189e7b382bf10
[INFO] running `Command { std: "docker" "start" "-a" "bbe094c8418486120f7fdfe8e238f2da7de0ff9f0daaa6639c1189e7b382bf10", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.70
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling futures-core v0.3.29
[INFO] [stderr]    Compiling futures-channel v0.3.29
[INFO] [stderr]    Compiling futures-task v0.3.29
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]     Checking futures-sink v0.3.29
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]    Compiling futures-util v0.3.29
[INFO] [stderr]     Checking futures-io v0.3.29
[INFO] [stderr]     Checking smallvec v1.11.2
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking bytes v1.5.0
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.41
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking socket2 v0.5.5
[INFO] [stderr]     Checking mio v0.8.10
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]    Compiling file-lock v2.1.10
[INFO] [stderr]    Compiling futures-macro v0.3.29
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking tokio v1.35.0
[INFO] [stderr]     Checking futures-executor v0.3.29
[INFO] [stderr]     Checking futures v0.3.29
[INFO] [stderr]     Checking tinymapreduce v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `file_lock::*`
[INFO] [stdout]  --> src/mapper.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use file_lock::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::writer::WriterHandle`
[INFO] [stdout]   --> src/mapper.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::writer::WriterHandle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `file_lock::*`
[INFO] [stdout]  --> src/mapper.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use file_lock::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::writer::WriterHandle`
[INFO] [stdout]   --> src/mapper.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::writer::WriterHandle;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `respond_to`
[INFO] [stdout]   --> src/reducer.rs:29:40
[INFO] [stdout]    |
[INFO] [stdout] 29 |             ReducerMessage:: Shuffle { respond_to, partition_name } => {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: try ignoring the field: `respond_to: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `partition_name`
[INFO] [stdout]   --> src/reducer.rs:29:52
[INFO] [stdout]    |
[INFO] [stdout] 29 |             ReducerMessage:: Shuffle { respond_to, partition_name } => {
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^ help: try ignoring the field: `partition_name: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `respond_to`
[INFO] [stdout]   --> src/reducer.rs:32:39
[INFO] [stdout]    |
[INFO] [stdout] 32 |             ReducerMessage:: Reduce { respond_to, partition_name} => {
[INFO] [stdout]    |                                       ^^^^^^^^^^ help: try ignoring the field: `respond_to: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `partition_name`
[INFO] [stdout]   --> src/reducer.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |             ReducerMessage:: Reduce { respond_to, partition_name} => {
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^^ help: try ignoring the field: `partition_name: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `occupied_mappers`
[INFO] [stdout]   --> src/main.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut occupied_mappers: HashMap<usize, reducer::HandleReducer> =
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_occupied_mappers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut files = std::fs::read_dir("./tmp")?
[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/main.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut occupied_mappers: HashMap<usize, reducer::HandleReducer> =
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `respond_to`
[INFO] [stdout]   --> src/reducer.rs:29:40
[INFO] [stdout]    |
[INFO] [stdout] 29 |             ReducerMessage:: Shuffle { respond_to, partition_name } => {
[INFO] [stdout]    |                                        ^^^^^^^^^^ help: try ignoring the field: `respond_to: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `partition_name`
[INFO] [stdout]   --> src/reducer.rs:29:52
[INFO] [stdout]    |
[INFO] [stdout] 29 |             ReducerMessage:: Shuffle { respond_to, partition_name } => {
[INFO] [stdout]    |                                                    ^^^^^^^^^^^^^^ help: try ignoring the field: `partition_name: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `respond_to`
[INFO] [stdout]   --> src/reducer.rs:32:39
[INFO] [stdout]    |
[INFO] [stdout] 32 |             ReducerMessage:: Reduce { respond_to, partition_name} => {
[INFO] [stdout]    |                                       ^^^^^^^^^^ help: try ignoring the field: `respond_to: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `partition_name`
[INFO] [stdout]   --> src/reducer.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |             ReducerMessage:: Reduce { respond_to, partition_name} => {
[INFO] [stdout]    |                                                   ^^^^^^^^^^^^^^ help: try ignoring the field: `partition_name: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `occupied_mappers`
[INFO] [stdout]   --> src/main.rs:93:13
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut occupied_mappers: HashMap<usize, reducer::HandleReducer> =
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_occupied_mappers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut files = std::fs::read_dir("./tmp")?
[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/main.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let mut occupied_mappers: HashMap<usize, reducer::HandleReducer> =
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.46s
[INFO] running `Command { std: "docker" "inspect" "bbe094c8418486120f7fdfe8e238f2da7de0ff9f0daaa6639c1189e7b382bf10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbe094c8418486120f7fdfe8e238f2da7de0ff9f0daaa6639c1189e7b382bf10", kill_on_drop: false }`
[INFO] [stdout] bbe094c8418486120f7fdfe8e238f2da7de0ff9f0daaa6639c1189e7b382bf10