[INFO] cloning repository https://github.com/kaifastromai/cs-os-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kaifastromai/cs-os-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkaifastromai%2Fcs-os-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkaifastromai%2Fcs-os-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8d4e8a3b7d65a25289f0f3f9ea63b7f6bdb62df7
[INFO] checking kaifastromai/cs-os-rust against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkaifastromai%2Fcs-os-rust" "/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/kaifastromai/cs-os-rust
[INFO] finished tweaking git repo https://github.com/kaifastromai/cs-os-rust
[INFO] tweaked toml for git repo https://github.com/kaifastromai/cs-os-rust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kaifastromai/cs-os-rust on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kaifastromai/cs-os-rust 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 54c7cf9d524ff2702da8519dbb277c54417a04c88ed5dd3e24492f25a41d4fc6
[INFO] running `Command { std: "docker" "start" "-a" "54c7cf9d524ff2702da8519dbb277c54417a04c88ed5dd3e24492f25a41d4fc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "54c7cf9d524ff2702da8519dbb277c54417a04c88ed5dd3e24492f25a41d4fc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54c7cf9d524ff2702da8519dbb277c54417a04c88ed5dd3e24492f25a41d4fc6", kill_on_drop: false }`
[INFO] [stdout] 54c7cf9d524ff2702da8519dbb277c54417a04c88ed5dd3e24492f25a41d4fc6
[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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e1a43f82eb34c3d3238df13cac26187cf6ed96643bfade236c06c44f208dac0d
[INFO] running `Command { std: "docker" "start" "-a" "e1a43f82eb34c3d3238df13cac26187cf6ed96643bfade236c06c44f208dac0d", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling nix v0.18.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking cs-operating-systems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `CStr`
[INFO] [stdout]  --> src/main.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ffi::{CStr, CString};
[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: `unistd::chdir`
[INFO] [stdout]  --> src/main.rs:5:42
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::{fcntl::OFlag, sys::stat::Mode, unistd::chdir};
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `sys::wait::WaitPidFlag` and `unistd::close`
[INFO] [stdout]  --> src/main.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 6 | use nix::{sys::wait::WaitPidFlag, sys::wait::WaitStatus, unistd::close};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^^^                         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::BufRead`
[INFO] [stdout]  --> src/main.rs:9:16
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::{ffi, io::BufRead};
[INFO] [stdout]   |                ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:146:16
[INFO] [stdout]     |
[INFO] [stdout] 146 |             if (matches.opt_present("exec2")) {
[INFO] [stdout]     |                ^                            ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 146 -             if (matches.opt_present("exec2")) {
[INFO] [stdout] 146 +             if matches.opt_present("exec2")  {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:164:22
[INFO] [stdout]     |
[INFO] [stdout] 160 | /             nix::unistd::execvp(
[INFO] [stdout] 161 | |                 &CString::new(args.exec1.clone()).unwrap(),
[INFO] [stdout] 162 | |                 &[&CString::new(args.exec1).unwrap()],
[INFO] [stdout] 163 | |             )
[INFO] [stdout] 164 | |             .unwrap();
[INFO] [stdout]     | |                     -^ unreachable expression
[INFO] [stdout]     | |_____________________|
[INFO] [stdout]     |                       any code following this expression is unreachable
[INFO] [stdout]     |
[INFO] [stdout] note: this expression has type `Infallible`, which is uninhabited
[INFO] [stdout]    --> src/main.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 | /             nix::unistd::execvp(
[INFO] [stdout] 161 | |                 &CString::new(args.exec1.clone()).unwrap(),
[INFO] [stdout] 162 | |                 &[&CString::new(args.exec1).unwrap()],
[INFO] [stdout] 163 | |             )
[INFO] [stdout] 164 | |             .unwrap();
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prog`
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let prog = env_args[0].clone();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_prog`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `DEV` is never used
[INFO] [stdout]   --> src/main.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static DEV: bool = true;
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:78:33
[INFO] [stdout]    |
[INFO] [stdout] 78 |             args.outfile_type = String::from_str("o").unwrap();
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:85:33
[INFO] [stdout]    |
[INFO] [stdout] 85 |             args.outfile_type = String::from_str("a").unwrap();
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `CStr`
[INFO] [stdout]  --> src/main.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ffi::{CStr, CString};
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cs-operating-systems` (bin "cs-operating-systems") due to 2 previous errors; 8 warnings emitted
[INFO] [stdout] warning: unused import: `unistd::chdir`
[INFO] [stdout]  --> src/main.rs:5:42
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::{fcntl::OFlag, sys::stat::Mode, unistd::chdir};
[INFO] [stdout]   |                                          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused imports: `sys::wait::WaitPidFlag` and `unistd::close`
[INFO] [stdout]  --> src/main.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 6 | use nix::{sys::wait::WaitPidFlag, sys::wait::WaitStatus, unistd::close};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^^^                         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::BufRead`
[INFO] [stdout]  --> src/main.rs:9:16
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::{ffi, io::BufRead};
[INFO] [stdout]   |                ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:146:16
[INFO] [stdout]     |
[INFO] [stdout] 146 |             if (matches.opt_present("exec2")) {
[INFO] [stdout]     |                ^                            ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 146 -             if (matches.opt_present("exec2")) {
[INFO] [stdout] 146 +             if matches.opt_present("exec2")  {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:164:22
[INFO] [stdout]     |
[INFO] [stdout] 160 | /             nix::unistd::execvp(
[INFO] [stdout] 161 | |                 &CString::new(args.exec1.clone()).unwrap(),
[INFO] [stdout] 162 | |                 &[&CString::new(args.exec1).unwrap()],
[INFO] [stdout] 163 | |             )
[INFO] [stdout] 164 | |             .unwrap();
[INFO] [stdout]     | |                     -^ unreachable expression
[INFO] [stdout]     | |_____________________|
[INFO] [stdout]     |                       any code following this expression is unreachable
[INFO] [stdout]     |
[INFO] [stdout] note: this expression has type `Infallible`, which is uninhabited
[INFO] [stdout]    --> src/main.rs:160:13
[INFO] [stdout]     |
[INFO] [stdout] 160 | /             nix::unistd::execvp(
[INFO] [stdout] 161 | |                 &CString::new(args.exec1.clone()).unwrap(),
[INFO] [stdout] 162 | |                 &[&CString::new(args.exec1).unwrap()],
[INFO] [stdout] 163 | |             )
[INFO] [stdout] 164 | |             .unwrap();
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prog`
[INFO] [stdout]   --> src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let prog = env_args[0].clone();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_prog`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `DEV` is never used
[INFO] [stdout]   --> src/main.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | static DEV: bool = true;
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:78:33
[INFO] [stdout]    |
[INFO] [stdout] 78 |             args.outfile_type = String::from_str("o").unwrap();
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:85:33
[INFO] [stdout]    |
[INFO] [stdout] 85 |             args.outfile_type = String::from_str("a").unwrap();
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cs-operating-systems` (bin "cs-operating-systems" test) due to 2 previous errors; 8 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "e1a43f82eb34c3d3238df13cac26187cf6ed96643bfade236c06c44f208dac0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1a43f82eb34c3d3238df13cac26187cf6ed96643bfade236c06c44f208dac0d", kill_on_drop: false }`
[INFO] [stdout] e1a43f82eb34c3d3238df13cac26187cf6ed96643bfade236c06c44f208dac0d
