[INFO] cloning repository https://github.com/nipzu/primesieve
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nipzu/primesieve" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnipzu%2Fprimesieve", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnipzu%2Fprimesieve'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f119f08aeedd5682629124062d67a99dc11a573
[INFO] checking nipzu/primesieve against master#82310651b93a594a3fd69015e1562186a080d94c for pr-145770
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnipzu%2Fprimesieve" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nipzu/primesieve
[INFO] finished tweaking git repo https://github.com/nipzu/primesieve
[INFO] tweaked toml for git repo https://github.com/nipzu/primesieve written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nipzu/primesieve on toolchain 82310651b93a594a3fd69015e1562186a080d94c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+82310651b93a594a3fd69015e1562186a080d94c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nipzu/primesieve 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" "+82310651b93a594a3fd69015e1562186a080d94c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+82310651b93a594a3fd69015e1562186a080d94c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be99cc8cccbf0fe11b3b934b288dad255931806aca50f8716b69e0d6b474ca5b
[INFO] running `Command { std: "docker" "start" "-a" "be99cc8cccbf0fe11b3b934b288dad255931806aca50f8716b69e0d6b474ca5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be99cc8cccbf0fe11b3b934b288dad255931806aca50f8716b69e0d6b474ca5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be99cc8cccbf0fe11b3b934b288dad255931806aca50f8716b69e0d6b474ca5b", kill_on_drop: false }`
[INFO] [stdout] be99cc8cccbf0fe11b3b934b288dad255931806aca50f8716b69e0d6b474ca5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+82310651b93a594a3fd69015e1562186a080d94c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d474110454a6838d14fe85af40477c0f21b2b43a485d1f23f9cad203241e20e0
[INFO] running `Command { std: "docker" "start" "-a" "d474110454a6838d14fe85af40477c0f21b2b43a485d1f23f9cad203241e20e0", kill_on_drop: false }`
[INFO] [stderr]     Checking primesieve v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/sieve.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             return todo!();
[INFO] [stdout]    |             ^^^^^^^-------
[INFO] [stdout]    |             |      |
[INFO] [stdout]    |             |      any code following this expression is unreachable
[INFO] [stdout]    |             unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `small_sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let (small_sieving_primes, medium_sieving_primes) = self.get_sieving_primes(end);
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_small_sieving_primes`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `medium_sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let (small_sieving_primes, medium_sieving_primes) = self.get_sieving_primes(end);
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_medium_sieving_primes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/sieve.rs:25:34
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_sieving_primes(&self, end: u64) -> (Vec<u64>, [Vec<u64>; 8]) {
[INFO] [stdout]    |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/sieve.rs:29:51
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |                                                   ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `buffer`
[INFO] [stdout]   --> src/sieve.rs:29:61
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |                                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_buffer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/sieve.rs:35:29
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_prime`
[INFO] [stdout]   --> src/sieve.rs:35:41
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_prime`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:35:62
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sieving_primes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/lib.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let start = match range.start_bound() {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/lib.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let end = match range.end_bound() {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/lib.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let start = match range.start_bound() {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/lib.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let end = match range.end_bound() {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `start` and `end` are never read
[INFO] [stdout]   --> src/lib.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct PrimeIterator {
[INFO] [stdout]    |            ------------- fields in this struct
[INFO] [stdout] 11 |     start: u64,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 12 |     end: u64,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PrimeSieve` is never constructed
[INFO] [stdout]  --> src/sieve.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct PrimeSieve {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `sieve_range`, `get_sieving_primes`, `sieve_range_with_buffer`, and `sieve_segment` are never used
[INFO] [stdout]   --> src/sieve.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PrimeSieve {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 12 |     fn sieve_range(&self, start: u64, end: u64) -> SievedPrimes {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn get_sieving_primes(&self, end: u64) -> (Vec<u64>, [Vec<u64>; 8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SievedPrimes` is never constructed
[INFO] [stdout]   --> src/sieve.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct SievedPrimes {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/sieve.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             return todo!();
[INFO] [stdout]    |             ^^^^^^^-------
[INFO] [stdout]    |             |      |
[INFO] [stdout]    |             |      any code following this expression is unreachable
[INFO] [stdout]    |             unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `small_sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let (small_sieving_primes, medium_sieving_primes) = self.get_sieving_primes(end);
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_small_sieving_primes`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `medium_sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:18:36
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let (small_sieving_primes, medium_sieving_primes) = self.get_sieving_primes(end);
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_medium_sieving_primes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/sieve.rs:25:34
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_sieving_primes(&self, end: u64) -> (Vec<u64>, [Vec<u64>; 8]) {
[INFO] [stdout]    |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/sieve.rs:29:51
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |                                                   ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `buffer`
[INFO] [stdout]   --> src/sieve.rs:29:61
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |                                                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_buffer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/sieve.rs:35:29
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_prime`
[INFO] [stdout]   --> src/sieve.rs:35:41
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_prime`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sieving_primes`
[INFO] [stdout]   --> src/sieve.rs:35:62
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sieving_primes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/lib.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let start = match range.start_bound() {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/lib.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let end = match range.end_bound() {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/lib.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let start = match range.start_bound() {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `end`
[INFO] [stdout]   --> src/lib.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let end = match range.end_bound() {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_end`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `start` and `end` are never read
[INFO] [stdout]   --> src/lib.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct PrimeIterator {
[INFO] [stdout]    |            ------------- fields in this struct
[INFO] [stdout] 11 |     start: u64,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 12 |     end: u64,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PrimeSieve` is never constructed
[INFO] [stdout]  --> src/sieve.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct PrimeSieve {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `sieve_range`, `get_sieving_primes`, `sieve_range_with_buffer`, and `sieve_segment` are never used
[INFO] [stdout]   --> src/sieve.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PrimeSieve {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 12 |     fn sieve_range(&self, start: u64, end: u64) -> SievedPrimes {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn get_sieving_primes(&self, end: u64) -> (Vec<u64>, [Vec<u64>; 8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn sieve_range_with_buffer(&self, start: u64, end: u64, buffer: &mut [u8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn sieve_segment(&self, start: u64, is_prime: &mut [u8], sieving_primes: &[Vec<u64>; 8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SievedPrimes` is never constructed
[INFO] [stdout]   --> src/sieve.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct SievedPrimes {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:194:43
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let (mut primes, mut is_prime_buffer, mut sieving_primes) = sieve_first_segment(n);
[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:194:43
[INFO] [stdout]     |
[INFO] [stdout] 194 |     let (mut primes, mut is_prime_buffer, mut sieving_primes) = sieve_first_segment(n);
[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]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.80s
[INFO] running `Command { std: "docker" "inspect" "d474110454a6838d14fe85af40477c0f21b2b43a485d1f23f9cad203241e20e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d474110454a6838d14fe85af40477c0f21b2b43a485d1f23f9cad203241e20e0", kill_on_drop: false }`
[INFO] [stdout] d474110454a6838d14fe85af40477c0f21b2b43a485d1f23f9cad203241e20e0
