[INFO] cloning repository https://github.com/AD17YAKR/rusty-crab-shack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AD17YAKR/rusty-crab-shack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAD17YAKR%2Frusty-crab-shack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAD17YAKR%2Frusty-crab-shack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 31d41e52d490cbce8ce62683c0ae3645f76159e0
[INFO] checking AD17YAKR/rusty-crab-shack against try#a3a874232ae0a7586b5fbe7483c5a42e157bd62a for pr-151109
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAD17YAKR%2Frusty-crab-shack" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/AD17YAKR/rusty-crab-shack
[INFO] finished tweaking git repo https://github.com/AD17YAKR/rusty-crab-shack
[INFO] tweaked toml for git repo https://github.com/AD17YAKR/rusty-crab-shack written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/AD17YAKR/rusty-crab-shack on toolchain a3a874232ae0a7586b5fbe7483c5a42e157bd62a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3a874232ae0a7586b5fbe7483c5a42e157bd62a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/AD17YAKR/rusty-crab-shack 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" "+a3a874232ae0a7586b5fbe7483c5a42e157bd62a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+a3a874232ae0a7586b5fbe7483c5a42e157bd62a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46001b8c89380723cbe172eeb3ba46744738397bea2b1333d796aeb046a0cefc
[INFO] running `Command { std: "docker" "start" "-a" "46001b8c89380723cbe172eeb3ba46744738397bea2b1333d796aeb046a0cefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46001b8c89380723cbe172eeb3ba46744738397bea2b1333d796aeb046a0cefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46001b8c89380723cbe172eeb3ba46744738397bea2b1333d796aeb046a0cefc", kill_on_drop: false }`
[INFO] [stdout] 46001b8c89380723cbe172eeb3ba46744738397bea2b1333d796aeb046a0cefc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+a3a874232ae0a7586b5fbe7483c5a42e157bd62a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 308d06704b6e391ab53a28edc6f047797c3aca033a1c879b9e112bed71b82201
[INFO] running `Command { std: "docker" "start" "-a" "308d06704b6e391ab53a28edc6f047797c3aca033a1c879b9e112bed71b82201", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.180
[INFO] [stderr]    Compiling zerocopy v0.8.33
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rusty-wc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `meow::bytes_processing::bytes_processing_meow`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use meow::bytes_processing::bytes_processing_meow;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `meow::string_processing::string_processing_meow`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use meow::string_processing::string_processing_meow;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `meow::bytes_processing::bytes_processing_meow`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use meow::bytes_processing::bytes_processing_meow;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `meow::string_processing::string_processing_meow`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use meow::string_processing::string_processing_meow;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/meow/string_processing.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut lines: usize = 0;
[INFO] [stdout]   |         ----^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/meow/string_processing.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut words: usize = 0;
[INFO] [stdout]   |         ----^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/meow/string_processing.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut in_word = false;
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lines`
[INFO] [stdout]  --> src/meow/string_processing.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut lines: usize = 0;
[INFO] [stdout]   |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lines`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]  --> src/meow/string_processing.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut words: usize = 0;
[INFO] [stdout]   |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bytes`
[INFO] [stdout]  --> src/meow/string_processing.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let bytes: usize = contents.len();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_bytes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `in_word`
[INFO] [stdout]   --> src/meow/string_processing.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut in_word = false;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_in_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `head` is never used
[INFO] [stdout]   --> src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn head() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `meow` is never used
[INFO] [stdout]   --> src/main.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn meow() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rusty_wc` is never used
[INFO] [stdout]   --> src/main.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn rusty_wc() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing_head` is never used
[INFO] [stdout]   --> src/head/stream_processing.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn stream_processing_head(filename: &str, max_lines: usize) -> io::Result<()> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bytes_processing_meow` is never used
[INFO] [stdout]   --> src/meow/bytes_processing.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn bytes_processing_meow(filename: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing_meow` is never used
[INFO] [stdout]  --> src/meow/stream_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn stream_processing_meow(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_processing_meow` is never used
[INFO] [stdout]  --> src/meow/string_processing.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn string_processing_meow(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bytes_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/bytes_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn bytes_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/stream_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn stream_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/string_processing.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn string_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/meow/string_processing.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut lines: usize = 0;
[INFO] [stdout]   |         ----^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/meow/string_processing.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut words: usize = 0;
[INFO] [stdout]   |         ----^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/meow/string_processing.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut in_word = false;
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lines`
[INFO] [stdout]  --> src/meow/string_processing.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut lines: usize = 0;
[INFO] [stdout]   |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lines`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]  --> src/meow/string_processing.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut words: usize = 0;
[INFO] [stdout]   |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bytes`
[INFO] [stdout]  --> src/meow/string_processing.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let bytes: usize = contents.len();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_bytes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `in_word`
[INFO] [stdout]   --> src/meow/string_processing.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut in_word = false;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_in_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `head` is never used
[INFO] [stdout]   --> src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn head() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `meow` is never used
[INFO] [stdout]   --> src/main.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn meow() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rusty_wc` is never used
[INFO] [stdout]   --> src/main.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn rusty_wc() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing_head` is never used
[INFO] [stdout]   --> src/head/stream_processing.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn stream_processing_head(filename: &str, max_lines: usize) -> io::Result<()> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bytes_processing_meow` is never used
[INFO] [stdout]   --> src/meow/bytes_processing.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn bytes_processing_meow(filename: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing_meow` is never used
[INFO] [stdout]  --> src/meow/stream_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn stream_processing_meow(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_processing_meow` is never used
[INFO] [stdout]  --> src/meow/string_processing.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn string_processing_meow(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bytes_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/bytes_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn bytes_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/stream_processing.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn stream_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string_processing` is never used
[INFO] [stdout]  --> src/rusty_wc/string_processing.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn string_processing(filename: &str) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     stream_processing_head(&filename, n);
[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] 40 |     let _ = stream_processing_head(&filename, n);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     stream_processing_head(&filename, n);
[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] 40 |     let _ = stream_processing_head(&filename, n);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.67s
[INFO] running `Command { std: "docker" "inspect" "308d06704b6e391ab53a28edc6f047797c3aca033a1c879b9e112bed71b82201", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "308d06704b6e391ab53a28edc6f047797c3aca033a1c879b9e112bed71b82201", kill_on_drop: false }`
[INFO] [stdout] 308d06704b6e391ab53a28edc6f047797c3aca033a1c879b9e112bed71b82201
