[INFO] cloning repository https://github.com/Jhynjhiruu/lettertool
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Jhynjhiruu/lettertool" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJhynjhiruu%2Flettertool", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJhynjhiruu%2Flettertool'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 192aac0e025a41aed4da8cdaa9a15d4a9e7d72df
[INFO] checking Jhynjhiruu/lettertool against master#040e2f8b9ff2d76fbe2146d6003e297ed4532088 for pr-143619
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJhynjhiruu%2Flettertool" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Jhynjhiruu/lettertool
[INFO] finished tweaking git repo https://github.com/Jhynjhiruu/lettertool
[INFO] tweaked toml for git repo https://github.com/Jhynjhiruu/lettertool written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Jhynjhiruu/lettertool on toolchain 040e2f8b9ff2d76fbe2146d6003e297ed4532088
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+040e2f8b9ff2d76fbe2146d6003e297ed4532088" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Jhynjhiruu/lettertool 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" "+040e2f8b9ff2d76fbe2146d6003e297ed4532088" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded binrw_derive v0.14.1
[INFO] [stderr]   Downloaded binrw v0.14.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+040e2f8b9ff2d76fbe2146d6003e297ed4532088" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ffe6e6c1a7093b7d75a458a9fadd1e3d4abdbdb12d574cf0e758f0538335949d
[INFO] running `Command { std: "docker" "start" "-a" "ffe6e6c1a7093b7d75a458a9fadd1e3d4abdbdb12d574cf0e758f0538335949d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffe6e6c1a7093b7d75a458a9fadd1e3d4abdbdb12d574cf0e758f0538335949d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffe6e6c1a7093b7d75a458a9fadd1e3d4abdbdb12d574cf0e758f0538335949d", kill_on_drop: false }`
[INFO] [stdout] ffe6e6c1a7093b7d75a458a9fadd1e3d4abdbdb12d574cf0e758f0538335949d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+040e2f8b9ff2d76fbe2146d6003e297ed4532088" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 161e24b421926343d61d9b1a313ba698ce5b5c5eef49966e3d4ff0b9904ce621
[INFO] running `Command { std: "docker" "start" "-a" "161e24b421926343d61d9b1a313ba698ce5b5c5eef49966e3d4ff0b9904ce621", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking utf8parse v0.2.2
[INFO] [stderr]     Checking colorchoice v1.0.3
[INFO] [stderr]    Compiling binrw_derive v0.14.1
[INFO] [stderr]     Checking is_terminal_polyfill v1.70.1
[INFO] [stderr]     Checking anstyle-query v1.1.2
[INFO] [stderr]     Checking anstyle v1.0.10
[INFO] [stderr]     Checking strsim v0.11.1
[INFO] [stderr]    Compiling binrw v0.14.1
[INFO] [stderr]     Checking clap_lex v0.7.4
[INFO] [stderr]     Checking anstyle-parse v0.2.6
[INFO] [stderr]    Compiling anyhow v1.0.95
[INFO] [stderr]    Compiling owo-colors v3.5.0
[INFO] [stderr]     Checking anstream v0.6.18
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking bytemuck v1.21.0
[INFO] [stderr]     Checking array-init v2.1.0
[INFO] [stderr]     Checking hex-literal v0.4.1
[INFO] [stderr]     Checking clap_builder v4.5.27
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.96
[INFO] [stderr]    Compiling clap_derive v4.5.24
[INFO] [stderr]     Checking clap v4.5.27
[INFO] [stderr]    Compiling modular-bitfield-impl v0.11.2
[INFO] [stderr]     Checking modular-bitfield v0.11.2
[INFO] [stderr]     Checking lettertool v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `collections::HashMap`
[INFO] [stdout]  --> src/encoding.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{char::REPLACEMENT_CHARACTER, collections::HashMap};
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `env::args`, `fs::read`, and `process::exit`
[INFO] [stdout]  --> src/lib.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{env::args, fmt::Debug, fs::read, io::Cursor, num::Wrapping, process::exit};
[INFO] [stdout]   |           ^^^^^^^^^              ^^^^^^^^                             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BinRead`
[INFO] [stdout]  --> src/lib.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 | use binrw::{binrw, BinRead, BinWrite};
[INFO] [stdout]   |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]  --> src/lib.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use encoding::{decode, decode_lossy, encode, DecoderTable};
[INFO] [stdout]   |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `collections::HashMap`
[INFO] [stdout]  --> src/encoding.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{char::REPLACEMENT_CHARACTER, collections::HashMap};
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hex_literal::hex`
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex_literal::hex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     blue: bool,
[INFO] [stdout]    |     ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 78 -     blue: bool,
[INFO] [stdout] 78 +     lue: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `env::args`, `fs::read`, and `process::exit`
[INFO] [stdout]  --> src/lib.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{env::args, fmt::Debug, fs::read, io::Cursor, num::Wrapping, process::exit};
[INFO] [stdout]   |           ^^^^^^^^^              ^^^^^^^^                             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BinRead`
[INFO] [stdout]  --> src/lib.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 | use binrw::{binrw, BinRead, BinWrite};
[INFO] [stdout]   |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     open: bool,
[INFO] [stdout]    |     ^        ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 79 -     open: bool,
[INFO] [stdout] 79 +     pen: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `decode`
[INFO] [stdout]  --> src/lib.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use encoding::{decode, decode_lossy, encode, DecoderTable};
[INFO] [stdout]   |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     open_2: bool,
[INFO] [stdout]    |     ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 80 -     open_2: bool,
[INFO] [stdout] 80 +     pen_2: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hex_literal::hex`
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex_literal::hex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     blue: bool,
[INFO] [stdout]    |     ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 78 -     blue: bool,
[INFO] [stdout] 78 +     lue: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:112:5
[INFO] [stdout]     |
[INFO] [stdout] 112 |     is_villager: bool,
[INFO] [stdout]     |     ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 112 -     is_villager: bool,
[INFO] [stdout] 112 +     s_villager: boo,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     open: bool,
[INFO] [stdout]    |     ^        ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 79 -     open: bool,
[INFO] [stdout] 79 +     pen: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/lib.rs:80:5
[INFO] [stdout]    |
[INFO] [stdout] 80 |     open_2: bool,
[INFO] [stdout]    |     ^          ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 80 -     open_2: bool,
[INFO] [stdout] 80 +     pen_2: boo,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:112:5
[INFO] [stdout]     |
[INFO] [stdout] 112 |     is_villager: bool,
[INFO] [stdout]     |     ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 112 -     is_villager: bool,
[INFO] [stdout] 112 +     s_villager: boo,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `blue`, `open`, and `open_2` are never used
[INFO] [stdout]   --> src/lib.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | / #[binrw]
[INFO] [stdout] 75 | | #[derive(Debug, Clone, Copy)]
[INFO] [stdout] 76 | | #[br(map = Self::from_bytes)]
[INFO] [stdout] 77 | | pub struct LetterFlags {
[INFO] [stdout]    | |______________________- methods in this implementation
[INFO] [stdout] 78 |       blue: bool,
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 79 |       open: bool,
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 80 |       open_2: bool,
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_villager` is never used
[INFO] [stdout]    --> src/lib.rs:112:5
[INFO] [stdout]     |
[INFO] [stdout] 108 | / #[binrw]
[INFO] [stdout] 109 | | #[derive(Debug, Clone, Copy, PartialEq, Eq)]
[INFO] [stdout] 110 | | #[br(map = Self::from_bytes)]
[INFO] [stdout] 111 | | pub struct NameFlags {
[INFO] [stdout]     | |____________________- method in this implementation
[INFO] [stdout] 112 |       is_villager: bool,
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decode` is never used
[INFO] [stdout]   --> src/encoding.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn decode<T: Decoder<U>, U>(string: &[U], mut decoder: T) -> Result<String> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `blue`, `open`, and `open_2` are never used
[INFO] [stdout]   --> src/lib.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | / #[binrw]
[INFO] [stdout] 75 | | #[derive(Debug, Clone, Copy)]
[INFO] [stdout] 76 | | #[br(map = Self::from_bytes)]
[INFO] [stdout] 77 | | pub struct LetterFlags {
[INFO] [stdout]    | |______________________- methods in this implementation
[INFO] [stdout] 78 |       blue: bool,
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 79 |       open: bool,
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 80 |       open_2: bool,
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_villager` is never used
[INFO] [stdout]    --> src/lib.rs:112:5
[INFO] [stdout]     |
[INFO] [stdout] 108 | / #[binrw]
[INFO] [stdout] 109 | | #[derive(Debug, Clone, Copy, PartialEq, Eq)]
[INFO] [stdout] 110 | | #[br(map = Self::from_bytes)]
[INFO] [stdout] 111 | | pub struct NameFlags {
[INFO] [stdout]     | |____________________- method in this implementation
[INFO] [stdout] 112 |       is_villager: bool,
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `decode` is never used
[INFO] [stdout]   --> src/encoding.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn decode<T: Decoder<U>, U>(string: &[U], mut decoder: T) -> Result<String> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 286 |     letterfile.write_be(&mut cursor);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 286 |     let _ = letterfile.write_be(&mut cursor);
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 286 |     letterfile.write_be(&mut cursor);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 286 |     let _ = letterfile.write_be(&mut cursor);
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut outfile = build();
[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:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut outfile = build();
[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: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     write(filename, outfile);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = write(filename, outfile);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     write(filename, outfile);
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = write(filename, outfile);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.12s
[INFO] running `Command { std: "docker" "inspect" "161e24b421926343d61d9b1a313ba698ce5b5c5eef49966e3d4ff0b9904ce621", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "161e24b421926343d61d9b1a313ba698ce5b5c5eef49966e3d4ff0b9904ce621", kill_on_drop: false }`
[INFO] [stdout] 161e24b421926343d61d9b1a313ba698ce5b5c5eef49966e3d4ff0b9904ce621