[INFO] updating cached repository https://github.com/Dizans/mapreduce-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e7eb403773360531cfb0cb1acc4768e9f05fb4cd
[INFO] checking Dizans/mapreduce-rust against master#73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de for pr-68325
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDizans%2Fmapreduce-rust" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dizans/mapreduce-rust on toolchain 73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Dizans/mapreduce-rust
[INFO] finished tweaking git repo https://github.com/Dizans/mapreduce-rust
[INFO] tweaked toml for git repo https://github.com/Dizans/mapreduce-rust written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/Dizans/mapreduce-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+73f76b74efcaf21bd5424d87c66cd6ed7fe5c7de" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] daeee35213463e5960491d20ca316834027de8cac9354f8c2c52ed545072eb99
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "daeee35213463e5960491d20ca316834027de8cac9354f8c2c52ed545072eb99"`
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking mr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `self`
[INFO] [stderr]  --> src/common_reduce.rs:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io::{self, prelude::*, BufReader};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]  --> src/common_reduce.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]  --> src/master_splitmerge.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufWriter`, `self`
[INFO] [stderr]  --> src/master_splitmerge.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{self, prelude::*, BufReader, BufWriter};
[INFO] [stderr]   |               ^^^^                         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::env;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude::*`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::io::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]   --> src/main.rs:12:22
[INFO] [stderr]    |
[INFO] [stderr] 12 | use clap::{App, Arg, SubCommand};
[INFO] [stderr]    |                      ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self`
[INFO] [stderr]  --> src/common_reduce.rs:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io::{self, prelude::*, BufReader};
[INFO] [stderr]   |               ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]  --> src/common_reduce.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering`
[INFO] [stderr]  --> src/master_splitmerge.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::Ordering;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufWriter`, `self`
[INFO] [stderr]  --> src/master_splitmerge.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{self, prelude::*, BufReader, BufWriter};
[INFO] [stderr]   |               ^^^^                         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::env;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude::*`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::io::prelude::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]   --> src/main.rs:12:22
[INFO] [stderr]    |
[INFO] [stderr] 12 | use clap::{App, Arg, SubCommand};
[INFO] [stderr]    |                      ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `job_name`
[INFO] [stderr]  --> src/master.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     job_name: &str,
[INFO] [stderr]   |     ^^^^^^^^ help: consider prefixing with an underscore: `_job_name`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `files`
[INFO] [stderr]  --> src/master.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     files: Vec<String>,
[INFO] [stderr]   |     ^^^^^ help: consider prefixing with an underscore: `_files`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n_reduce`
[INFO] [stderr]  --> src/master.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     n_reduce: usize,
[INFO] [stderr]   |     ^^^^^^^^ help: consider prefixing with an underscore: `_n_reduce`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/common_map.rs:23:13
[INFO] [stderr]    |
[INFO] [stderr] 23 |         let mut file =
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `job_name`
[INFO] [stderr]  --> src/master.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     job_name: &str,
[INFO] [stderr]   |     ^^^^^^^^ help: consider prefixing with an underscore: `_job_name`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `files`
[INFO] [stderr]  --> src/master.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     files: Vec<String>,
[INFO] [stderr]   |     ^^^^^ help: consider prefixing with an underscore: `_files`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n_reduce`
[INFO] [stderr]  --> src/master.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     n_reduce: usize,
[INFO] [stderr]   |     ^^^^^^^^ help: consider prefixing with an underscore: `_n_reduce`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/master.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn run<F: Fn(JobPhase)>(
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sequential`
[INFO] [stderr]   --> src/master.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn sequential(
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `seq_finish`
[INFO] [stderr]   --> src/master.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn seq_finish() {}
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `wc_seq`
[INFO] [stderr]   --> src/master.rs:44:4
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn wc_seq() {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `JobPhase`
[INFO] [stderr]  --> src/utils.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub enum JobPhase {
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/common_map.rs:23:13
[INFO] [stderr]    |
[INFO] [stderr] 23 |         let mut file =
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/master_splitmerge.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |         file.write_all(&format!("{}: {}\n", k, kvs.get(k).unwrap()).into_bytes());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/master.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn run<F: Fn(JobPhase)>(
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sequential`
[INFO] [stderr]   --> src/master.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn sequential(
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `seq_finish`
[INFO] [stderr]   --> src/master.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn seq_finish() {}
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `wc_seq`
[INFO] [stderr]   --> src/master.rs:44:4
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn wc_seq() {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `JobPhase`
[INFO] [stderr]  --> src/utils.rs:9:10
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub enum JobPhase {
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/master_splitmerge.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |         file.write_all(&format!("{}: {}\n", k, kvs.get(k).unwrap()).into_bytes());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.73s
[INFO] running `"docker" "inspect" "daeee35213463e5960491d20ca316834027de8cac9354f8c2c52ed545072eb99"`
[INFO] running `"docker" "rm" "-f" "daeee35213463e5960491d20ca316834027de8cac9354f8c2c52ed545072eb99"`
[INFO] [stdout] daeee35213463e5960491d20ca316834027de8cac9354f8c2c52ed545072eb99