[INFO] cloning repository https://github.com/KornilovLN/txt_by_clmn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KornilovLN/txt_by_clmn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKornilovLN%2Ftxt_by_clmn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKornilovLN%2Ftxt_by_clmn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ee31fdd8f4cbb2e861b49e872af5b2941a2b3c9
[INFO] checking KornilovLN/txt_by_clmn against try#22cc29ba5b459fb386c0406b9baf3a49eb0fba39 for pr-146095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKornilovLN%2Ftxt_by_clmn" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KornilovLN/txt_by_clmn
[INFO] finished tweaking git repo https://github.com/KornilovLN/txt_by_clmn
[INFO] tweaked toml for git repo https://github.com/KornilovLN/txt_by_clmn written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KornilovLN/txt_by_clmn on toolchain 22cc29ba5b459fb386c0406b9baf3a49eb0fba39
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KornilovLN/txt_by_clmn 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" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking KornilovLN/txt_by_clmn against try#22cc29ba5b459fb386c0406b9baf3a49eb0fba39 for pr-146095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKornilovLN%2Ftxt_by_clmn" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KornilovLN/txt_by_clmn
[INFO] finished tweaking git repo https://github.com/KornilovLN/txt_by_clmn
[INFO] tweaked toml for git repo https://github.com/KornilovLN/txt_by_clmn written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KornilovLN/txt_by_clmn on toolchain 22cc29ba5b459fb386c0406b9baf3a49eb0fba39
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KornilovLN/txt_by_clmn 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" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded locale v0.2.2
[INFO] [stderr]   Downloaded redox_termios v0.1.3
[INFO] [stderr]   Downloaded iso8601 v0.3.0
[INFO] [stderr]   Downloaded termion v2.0.3
[INFO] [stderr]   Downloaded datetime v0.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f31f734e911751935ea4076d95cef658d13458255e8dfcf3bce6dae6f59e0939
[INFO] running `Command { std: "docker" "start" "-a" "f31f734e911751935ea4076d95cef658d13458255e8dfcf3bce6dae6f59e0939", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f31f734e911751935ea4076d95cef658d13458255e8dfcf3bce6dae6f59e0939", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f31f734e911751935ea4076d95cef658d13458255e8dfcf3bce6dae6f59e0939", kill_on_drop: false }`
[INFO] [stdout] f31f734e911751935ea4076d95cef658d13458255e8dfcf3bce6dae6f59e0939
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+22cc29ba5b459fb386c0406b9baf3a49eb0fba39" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a855d4dee10da154fde5834062954e1cf2e2685450d6ab9ccf1559cd560a45c
[INFO] running `Command { std: "docker" "start" "-a" "7a855d4dee10da154fde5834062954e1cf2e2685450d6ab9ccf1559cd560a45c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.69
[INFO] [stderr]    Compiling libc v0.2.150
[INFO] [stderr]    Compiling serde v1.0.193
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]    Compiling serde_json v1.0.108
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]     Checking unicode-width v0.1.11
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking pad v0.1.6
[INFO] [stderr]     Checking iana-time-zone v0.1.58
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]     Checking os_info v3.7.0
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking locale v0.2.2
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking termion v2.0.3
[INFO] [stderr]    Compiling syn v2.0.39
[INFO] [stderr]     Checking iso8601 v0.3.0
[INFO] [stderr]     Checking chrono v0.4.31
[INFO] [stderr]     Checking datetime v0.5.2
[INFO] [stderr]    Compiling serde_derive v1.0.193
[INFO] [stderr]     Checking txt_by_clmn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `BufReader` and `Error`
[INFO] [stdout]  --> src/md_tocolumn.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, BufReader, BufRead, Error};
[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 imports: `BufReader` and `Error`
[INFO] [stdout]  --> src/md_tocolumn.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{self, BufReader, BufRead, Error};
[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 variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/md_utils.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut len = ((stroka.chars().count()) as i32) + 8; //--- так можно. 8 символов "<<< "*2
[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/md_utils.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut len = ((stroka.chars().count()) as i32) + 8; //--- так можно. 8 символов "<<< "*2
[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: unused variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     for i in 0..len-1 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/md_utils.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     for i in 0..len-1 {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/md_tocolumn.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let mut fileinfo = FileInfo {vstr: vstr,
[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/md_tocolumn.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let mut fileinfo = FileInfo {vstr: vstr,
[INFO] [stdout]    |                 ----^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_num_line_char` is never used
[INFO] [stdout]   --> src/md_utils.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn print_num_line_char(ch: &str, n: i32) {
[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 `get_timestamp` is never used
[INFO] [stdout]    --> src/md_utils.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 | pub fn get_timestamp() -> i64 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write_out` is never used
[INFO] [stdout]    --> src/md_utils.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub fn write_out(f: String, st: &str) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_string` is never used
[INFO] [stdout]    --> src/md_utils.rs:157:8
[INFO] [stdout]     |
[INFO] [stdout] 157 | pub fn read_string(comment:&str) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_EL_OUT` is never used
[INFO] [stdout]    --> src/md_utils.rs:170:7
[INFO] [stdout]     |
[INFO] [stdout] 170 | const MAX_EL_OUT: i32 = 24;
[INFO] [stdout]     |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_arr` is never used
[INFO] [stdout]    --> src/md_utils.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub fn out_arr(dt: [u32; 64], prompt: &str){
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_vec` is never used
[INFO] [stdout]    --> src/md_utils.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 | pub fn out_vec(dt: Vec<i32>, prompt: &str){
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_vec_float` is never used
[INFO] [stdout]    --> src/md_utils.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 | pub fn out_vec_float(dt: &Vec<f32>, prompt: &str){
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `save_json_about` is never used
[INFO] [stdout]   --> src/md_about.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn save_json_about(about: &StAbout) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_num_line_char` is never used
[INFO] [stdout]   --> src/md_utils.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn print_num_line_char(ch: &str, n: i32) {
[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 `get_timestamp` is never used
[INFO] [stdout]    --> src/md_utils.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 116 | pub fn get_timestamp() -> i64 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write_out` is never used
[INFO] [stdout]    --> src/md_utils.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub fn write_out(f: String, st: &str) -> io::Result<()> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_string` is never used
[INFO] [stdout]    --> src/md_utils.rs:157:8
[INFO] [stdout]     |
[INFO] [stdout] 157 | pub fn read_string(comment:&str) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `MAX_EL_OUT` is never used
[INFO] [stdout]    --> src/md_utils.rs:170:7
[INFO] [stdout]     |
[INFO] [stdout] 170 | const MAX_EL_OUT: i32 = 24;
[INFO] [stdout]     |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_arr` is never used
[INFO] [stdout]    --> src/md_utils.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub fn out_arr(dt: [u32; 64], prompt: &str){
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_vec` is never used
[INFO] [stdout]    --> src/md_utils.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 | pub fn out_vec(dt: Vec<i32>, prompt: &str){
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `out_vec_float` is never used
[INFO] [stdout]    --> src/md_utils.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 | pub fn out_vec_float(dt: &Vec<f32>, prompt: &str){
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `save_json_about` is never used
[INFO] [stdout]   --> src/md_about.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn save_json_about(about: &StAbout) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     io::stdout(). flush();
[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] 63 |     let _ = io::stdout(). flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     io::stdout(). flush();
[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] 63 |     let _ = io::stdout(). flush();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.13s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: iso8601 v0.3.0, nom v4.2.3
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "7a855d4dee10da154fde5834062954e1cf2e2685450d6ab9ccf1559cd560a45c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a855d4dee10da154fde5834062954e1cf2e2685450d6ab9ccf1559cd560a45c", kill_on_drop: false }`
[INFO] [stdout] 7a855d4dee10da154fde5834062954e1cf2e2685450d6ab9ccf1559cd560a45c
