[INFO] updating cached repository https://github.com/tyan-boot/pingcap-question
[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] f7ee6939293bcb13f9c1ad5baaaa4a1ce1d7dfe4
[INFO] testing tyan-boot/pingcap-question against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftyan-boot%2Fpingcap-question" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tyan-boot/pingcap-question on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tyan-boot/pingcap-question
[INFO] finished tweaking git repo https://github.com/tyan-boot/pingcap-question
[INFO] tweaked toml for git repo https://github.com/tyan-boot/pingcap-question written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/tyan-boot/pingcap-question already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d1b3e9c35cafe5f8acb84249599c8d9cc041d4cd780dc6883890b54fd3403b3c
[INFO] running `"docker" "start" "-a" "d1b3e9c35cafe5f8acb84249599c8d9cc041d4cd780dc6883890b54fd3403b3c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling backtrace v0.3.37
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling project-pingcap-algo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::BufReader`
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::BufReader;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Path`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::path::Path;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `bincode::ErrorKind`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use bincode::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `failure::Error`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use failure::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BufRead`
[INFO] [stderr]  --> src/v2/count.rs:5:32
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::{Read, BufReader, BufRead};
[INFO] [stderr]   |                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufRead`, `Read`, `Write`
[INFO] [stderr]  --> src/v2/io.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{Read, BufReader, BufRead, Write, Seek, SeekFrom};
[INFO] [stderr]   |               ^^^^             ^^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::id`
[INFO] [stderr]  --> src/v2/io.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::process::id;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/v2/io.rs:80:41
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                                         ^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/v2/io.rs:125:41
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                                         ^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]   --> src/v2/count.rs:29:26
[INFO] [stderr]    |
[INFO] [stderr] 29 |             Some((count, offset)) => {
[INFO] [stderr]    |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `buf`
[INFO] [stderr]    --> src/v2/io.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |                     let buf = bincode::serialized_size(&wo);
[INFO] [stderr]     |                         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/count.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         let mut item = self.map.get_mut(&word);
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/io.rs:46:24
[INFO] [stderr]    |
[INFO] [stderr] 46 |         while let Some(mut file) = self.big_chunks.pop() {
[INFO] [stderr]    |                        ----^^^^
[INFO] [stderr]    |                        |
[INFO] [stderr]    |                        help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Counter`
[INFO] [stderr]   --> src/v1/count.rs:12:12
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub struct Counter {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/v1/count.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new() -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count`
[INFO] [stderr]   --> src/v1/count.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn count(&mut self, key: String, offset: u64) -> u64 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `flush`
[INFO] [stderr]   --> src/v1/count.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     pub fn flush(&mut self) -> Result<File, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MergeCounter`
[INFO] [stderr]  --> src/v1/merge.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct MergeCounter {
[INFO] [stderr]   |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/v1/merge.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     pub fn new() -> Result<Self, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count`
[INFO] [stderr]   --> src/v1/merge.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn count(&mut self, key: String, other_count: u64, offset: u64) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_ans`
[INFO] [stderr]   --> src/v1/merge.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub fn get_ans(&mut self) -> Option<(String, u64)> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MergePair`
[INFO] [stderr]   --> src/v1.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | struct MergePair(String, u64, u64, BufReader<File>);
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Count`
[INFO] [stderr]   --> src/v1.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Count {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/v1.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn new<P: AsRef<Path>>(path: P) -> Result<Count, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_chunk`
[INFO] [stderr]   --> src/v1.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn count_chunk(&mut self) -> Result<(), Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `merge`
[INFO] [stderr]   --> src/v1.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn merge(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `solve`
[INFO] [stderr]    --> src/v1.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     pub fn solve(&mut self) -> Option<String> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/count.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |             chunk.read_to_end(&mut buff);
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:67:25
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         bincode::serialize_into(&mut chunk, &wo);
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:80:17
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:107:21
[INFO] [stderr]     |
[INFO] [stderr] 107 |                     bincode::serialize_into(&mut file, &wo);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:125:17
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 33 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 38.41s
[INFO] running `"docker" "inspect" "d1b3e9c35cafe5f8acb84249599c8d9cc041d4cd780dc6883890b54fd3403b3c"`
[INFO] running `"docker" "rm" "-f" "d1b3e9c35cafe5f8acb84249599c8d9cc041d4cd780dc6883890b54fd3403b3c"`
[INFO] [stdout] d1b3e9c35cafe5f8acb84249599c8d9cc041d4cd780dc6883890b54fd3403b3c
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c6305cb86ec57076d4dcee6e07fca8a846c8515c7bd74c08f56fa084132bdf3b
[INFO] running `"docker" "start" "-a" "c6305cb86ec57076d4dcee6e07fca8a846c8515c7bd74c08f56fa084132bdf3b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling project-pingcap-algo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::BufReader`
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::BufReader;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Path`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::path::Path;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `bincode::ErrorKind`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use bincode::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `failure::Error`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use failure::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BufRead`
[INFO] [stderr]  --> src/v2/count.rs:5:32
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::{Read, BufReader, BufRead};
[INFO] [stderr]   |                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufRead`, `Read`, `Write`
[INFO] [stderr]  --> src/v2/io.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{Read, BufReader, BufRead, Write, Seek, SeekFrom};
[INFO] [stderr]   |               ^^^^             ^^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::id`
[INFO] [stderr]  --> src/v2/io.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::process::id;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/v2/io.rs:80:41
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                                         ^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/v2/io.rs:125:41
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                                         ^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]   --> src/v2/count.rs:29:26
[INFO] [stderr]    |
[INFO] [stderr] 29 |             Some((count, offset)) => {
[INFO] [stderr]    |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `buf`
[INFO] [stderr]    --> src/v2/io.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |                     let buf = bincode::serialized_size(&wo);
[INFO] [stderr]     |                         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/count.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         let mut item = self.map.get_mut(&word);
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/io.rs:46:24
[INFO] [stderr]    |
[INFO] [stderr] 46 |         while let Some(mut file) = self.big_chunks.pop() {
[INFO] [stderr]    |                        ----^^^^
[INFO] [stderr]    |                        |
[INFO] [stderr]    |                        help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MergePair`
[INFO] [stderr]   --> src/v1.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | struct MergePair(String, u64, u64, BufReader<File>);
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Count`
[INFO] [stderr]   --> src/v1.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Count {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/v1.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn new<P: AsRef<Path>>(path: P) -> Result<Count, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_chunk`
[INFO] [stderr]   --> src/v1.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn count_chunk(&mut self) -> Result<(), Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `merge`
[INFO] [stderr]   --> src/v1.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn merge(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `solve`
[INFO] [stderr]    --> src/v1.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     pub fn solve(&mut self) -> Option<String> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/count.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |             chunk.read_to_end(&mut buff);
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:67:25
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         bincode::serialize_into(&mut chunk, &wo);
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:80:17
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:107:21
[INFO] [stderr]     |
[INFO] [stderr] 107 |                     bincode::serialize_into(&mut file, &wo);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:125:17
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 25 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.25s
[INFO] running `"docker" "inspect" "c6305cb86ec57076d4dcee6e07fca8a846c8515c7bd74c08f56fa084132bdf3b"`
[INFO] running `"docker" "rm" "-f" "c6305cb86ec57076d4dcee6e07fca8a846c8515c7bd74c08f56fa084132bdf3b"`
[INFO] [stdout] c6305cb86ec57076d4dcee6e07fca8a846c8515c7bd74c08f56fa084132bdf3b
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 521ec15d33823b910f3c5933eb50f1abda9f44fdbdf7c8381f682f7ce9535732
[INFO] running `"docker" "start" "-a" "521ec15d33823b910f3c5933eb50f1abda9f44fdbdf7c8381f682f7ce9535732"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::BufReader`
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::BufReader;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::path::Path`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::path::Path;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `bincode::ErrorKind`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use bincode::ErrorKind;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `failure::Error`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use failure::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BufRead`
[INFO] [stderr]  --> src/v2/count.rs:5:32
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::{Read, BufReader, BufRead};
[INFO] [stderr]   |                                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `BufRead`, `Read`, `Write`
[INFO] [stderr]  --> src/v2/io.rs:2:15
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io::{Read, BufReader, BufRead, Write, Seek, SeekFrom};
[INFO] [stderr]   |               ^^^^             ^^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::id`
[INFO] [stderr]  --> src/v2/io.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::process::id;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/v2/io.rs:80:41
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                                         ^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/v2/io.rs:125:41
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                                         ^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `offset`
[INFO] [stderr]   --> src/v2/count.rs:29:26
[INFO] [stderr]    |
[INFO] [stderr] 29 |             Some((count, offset)) => {
[INFO] [stderr]    |                          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_offset`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `buf`
[INFO] [stderr]    --> src/v2/io.rs:105:25
[INFO] [stderr]     |
[INFO] [stderr] 105 |                     let buf = bincode::serialized_size(&wo);
[INFO] [stderr]     |                         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/count.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 |         let mut item = self.map.get_mut(&word);
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/v2/io.rs:46:24
[INFO] [stderr]    |
[INFO] [stderr] 46 |         while let Some(mut file) = self.big_chunks.pop() {
[INFO] [stderr]    |                        ----^^^^
[INFO] [stderr]    |                        |
[INFO] [stderr]    |                        help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MergePair`
[INFO] [stderr]   --> src/v1.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | struct MergePair(String, u64, u64, BufReader<File>);
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Count`
[INFO] [stderr]   --> src/v1.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Count {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/v1.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn new<P: AsRef<Path>>(path: P) -> Result<Count, Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_chunk`
[INFO] [stderr]   --> src/v1.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     fn count_chunk(&mut self) -> Result<(), Error> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `merge`
[INFO] [stderr]   --> src/v1.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn merge(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `solve`
[INFO] [stderr]    --> src/v1.rs:125:5
[INFO] [stderr]     |
[INFO] [stderr] 125 |     pub fn solve(&mut self) -> Option<String> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/count.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |             chunk.read_to_end(&mut buff);
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:67:25
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         bincode::serialize_into(&mut chunk, &wo);
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/v2/io.rs:80:17
[INFO] [stderr]    |
[INFO] [stderr] 80 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:107:21
[INFO] [stderr]     |
[INFO] [stderr] 107 |                     bincode::serialize_into(&mut file, &wo);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/v2/io.rs:125:17
[INFO] [stderr]     |
[INFO] [stderr] 125 |                 it.seek(SeekFrom::Start((0)));
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 25 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.12s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/project_pingcap_algo-a45eb06be8e18111
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test v1::merge::test::test ... ok
[INFO] [stdout] test v1::count::test::test_count ... ok
[INFO] [stdout] test v1::io::test::test_word ... ok
[INFO] [stdout] test v1::count::test::test_flush ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "521ec15d33823b910f3c5933eb50f1abda9f44fdbdf7c8381f682f7ce9535732"`
[INFO] running `"docker" "rm" "-f" "521ec15d33823b910f3c5933eb50f1abda9f44fdbdf7c8381f682f7ce9535732"`
[INFO] [stdout] 521ec15d33823b910f3c5933eb50f1abda9f44fdbdf7c8381f682f7ce9535732