[INFO] cloning repository https://github.com/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkaito25atugich%2FIt-Took-X-Mitutes-For-Everyone-To-Quiet-Down", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkaito25atugich%2FIt-Took-X-Mitutes-For-Everyone-To-Quiet-Down'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a6c3087a04168ed8c010c0f1fa2d89cd94e29ac2
[INFO] checking kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down 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%2Fkaito25atugich%2FIt-Took-X-Mitutes-For-Everyone-To-Quiet-Down" "/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/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down
[INFO] finished tweaking git repo https://github.com/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down
[INFO] tweaked toml for git repo https://github.com/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down 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/kaito25atugich/It-Took-X-Mitutes-For-Everyone-To-Quiet-Down 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] 0174fcb317c4754f8bfaaaf858e5397f247601d9a7696b768d984cbe21e74dee
[INFO] running `Command { std: "docker" "start" "-a" "0174fcb317c4754f8bfaaaf858e5397f247601d9a7696b768d984cbe21e74dee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0174fcb317c4754f8bfaaaf858e5397f247601d9a7696b768d984cbe21e74dee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0174fcb317c4754f8bfaaaf858e5397f247601d9a7696b768d984cbe21e74dee", kill_on_drop: false }`
[INFO] [stdout] 0174fcb317c4754f8bfaaaf858e5397f247601d9a7696b768d984cbe21e74dee
[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] 829425fc4f2d808c7b58255b185558b7bf8399a1bbefcda330eb66f0bcbc18e0
[INFO] running `Command { std: "docker" "start" "-a" "829425fc4f2d808c7b58255b185558b7bf8399a1bbefcda330eb66f0bcbc18e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking getrandom v0.2.8
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking ITXMFET v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:72:40
[INFO] [stdout]    |
[INFO] [stdout] 72 |         let (num_st, max_patience_sec, mut min_size_id) = choose_difficulty();
[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/main.rs:114:37
[INFO] [stdout]     |
[INFO] [stdout] 114 | ...                   let mut num1 = num_silence_student.clone();
[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/main.rs:115:37
[INFO] [stdout]     |
[INFO] [stdout] 115 | ...                   let mut student = students[idx].clone();
[INFO] [stdout]     |                           ----^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:134:21
[INFO] [stdout]     |
[INFO] [stdout] 134 |                 Err(i) => {
[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: field `id` is never read
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Student {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     id: i64,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Student` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ITXMFET` (bin "ITXMFET" test) due to 2 previous errors; 7 warnings emitted
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |         io::stdin().read_line(&mut input);
[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] 45 |         let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |             io::stdin().read_line(&mut input);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 94 |             let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/main.rs:99:38
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     if min_size_id > i.try_into().unwrap() || min_size_id*10 < i.try_into().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<usize, Infallible>
[INFO] [stdout]   --> src/main.rs:99:80
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     if min_size_id > i.try_into().unwrap() || min_size_id*10 < i.try_into().unwrap() {
[INFO] [stdout]    |                                                                                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:72:40
[INFO] [stdout]    |
[INFO] [stdout] 72 |         let (num_st, max_patience_sec, mut min_size_id) = choose_difficulty();
[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/main.rs:114:37
[INFO] [stdout]     |
[INFO] [stdout] 114 | ...                   let mut num1 = num_silence_student.clone();
[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/main.rs:115:37
[INFO] [stdout]     |
[INFO] [stdout] 115 | ...                   let mut student = students[idx].clone();
[INFO] [stdout]     |                           ----^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:134:21
[INFO] [stdout]     |
[INFO] [stdout] 134 |                 Err(i) => {
[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: field `id` is never read
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Student {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     id: i64,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Student` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |         io::stdin().read_line(&mut input);
[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] 45 |         let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |             io::stdin().read_line(&mut input);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 94 |             let _ = io::stdin().read_line(&mut input);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/main.rs:99:38
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     if min_size_id > i.try_into().unwrap() || min_size_id*10 < i.try_into().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<usize, Infallible>
[INFO] [stdout]   --> src/main.rs:99:80
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     if min_size_id > i.try_into().unwrap() || min_size_id*10 < i.try_into().unwrap() {
[INFO] [stdout]    |                                                                                ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ITXMFET` (bin "ITXMFET") due to 2 previous errors; 7 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "829425fc4f2d808c7b58255b185558b7bf8399a1bbefcda330eb66f0bcbc18e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "829425fc4f2d808c7b58255b185558b7bf8399a1bbefcda330eb66f0bcbc18e0", kill_on_drop: false }`
[INFO] [stdout] 829425fc4f2d808c7b58255b185558b7bf8399a1bbefcda330eb66f0bcbc18e0
