[INFO] fetching crate snowchains_core 0.13.3...
[INFO] checking snowchains_core-0.13.3 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate snowchains_core 0.13.3 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate snowchains_core 0.13.3
[INFO] finished tweaking crates.io crate snowchains_core 0.13.3
[INFO] tweaked toml for crates.io crate snowchains_core 0.13.3 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate snowchains_core 0.13.3 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 crates.io crate snowchains_core 0.13.3 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-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 59e17ea58865219ede6a90a4c2d13c7352d725c8a4cddfdfd569de47b01f1f6a
[INFO] running `Command { std: "docker" "start" "-a" "59e17ea58865219ede6a90a4c2d13c7352d725c8a4cddfdfd569de47b01f1f6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59e17ea58865219ede6a90a4c2d13c7352d725c8a4cddfdfd569de47b01f1f6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59e17ea58865219ede6a90a4c2d13c7352d725c8a4cddfdfd569de47b01f1f6a", kill_on_drop: false }`
[INFO] [stdout] 59e17ea58865219ede6a90a4c2d13c7352d725c8a4cddfdfd569de47b01f1f6a
[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 -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] e3866e8640c99ba33d1e9b9bf1aac36b5321e77056231e60541adf23beb8ce66
[INFO] running `Command { std: "docker" "start" "-a" "e3866e8640c99ba33d1e9b9bf1aac36b5321e77056231e60541adf23beb8ce66", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `cell`
[INFO] [stdout]   --> src/web/mod.rs:94:5
[INFO] [stdout]    |
[INFO] [stdout] 94 |     cell,
[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: `cell`
[INFO] [stdout]   --> src/web/mod.rs:94:5
[INFO] [stdout]    |
[INFO] [stdout] 94 |     cell,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `phantom` is never read
[INFO] [stdout]    --> src/web/mod.rs:879:5
[INFO] [stdout]     |
[INFO] [stdout] 879 |     phantom: PhantomData<fn() -> C>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `extract_meta_x_csrf_token` is never used
[INFO] [stdout]    --> src/web/codeforces.rs:639:8
[INFO] [stdout]     |
[INFO] [stdout] 467 | #[ext]
[INFO] [stdout]     | ------ method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 639 |     fn extract_meta_x_csrf_token(&self) -> anyhow::Result<String> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]    --> src/web/codeforces.rs:664:23
[INFO] [stdout]     |
[INFO] [stdout] 664 |     pub(super) struct User {
[INFO] [stdout]     |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SubmissionVerdict` is never used
[INFO] [stdout]    --> src/web/codeforces.rs:732:21
[INFO] [stdout]     |
[INFO] [stdout] 732 |     pub(super) enum SubmissionVerdict {
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_all_problems` is never used
[INFO] [stdout]    --> src/web/yukicoder.rs:683:12
[INFO] [stdout]     |
[INFO] [stdout] 599 |     pub(super) trait SessionMutExt: SessionMut {
[INFO] [stdout]     |                      ------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 683 |         fn get_all_problems(&mut self) -> anyhow::Result<Vec<Problem>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReqwestAsyncClientExt` is never used
[INFO] [stdout]    --> src/web/yukicoder.rs:772:22
[INFO] [stdout]     |
[INFO] [stdout] 772 |     pub(super) trait ReqwestAsyncClientExt {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `phantom` is never read
[INFO] [stdout]    --> src/web/mod.rs:879:5
[INFO] [stdout]     |
[INFO] [stdout] 879 |     phantom: PhantomData<fn() -> C>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `extract_meta_x_csrf_token` is never used
[INFO] [stdout]    --> src/web/codeforces.rs:639:8
[INFO] [stdout]     |
[INFO] [stdout] 467 | #[ext]
[INFO] [stdout]     | ------ method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 639 |     fn extract_meta_x_csrf_token(&self) -> anyhow::Result<String> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]    --> src/web/codeforces.rs:664:23
[INFO] [stdout]     |
[INFO] [stdout] 664 |     pub(super) struct User {
[INFO] [stdout]     |                       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SubmissionVerdict` is never used
[INFO] [stdout]    --> src/web/codeforces.rs:732:21
[INFO] [stdout]     |
[INFO] [stdout] 732 |     pub(super) enum SubmissionVerdict {
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_all_problems` is never used
[INFO] [stdout]    --> src/web/yukicoder.rs:683:12
[INFO] [stdout]     |
[INFO] [stdout] 599 |     pub(super) trait SessionMutExt: SessionMut {
[INFO] [stdout]     |                      ------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 683 |         fn get_all_problems(&mut self) -> anyhow::Result<Vec<Problem>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ReqwestAsyncClientExt` is never used
[INFO] [stdout]    --> src/web/yukicoder.rs:772:22
[INFO] [stdout]     |
[INFO] [stdout] 772 |     pub(super) trait ReqwestAsyncClientExt {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, std::convert::Infallible>
[INFO] [stdout]   --> examples/judge.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | /     #[structopt(long, value_name("NAME"))]
[INFO] [stdout] 12 | |     testcases: Option<Vec<String>>,
[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<PathBuf, std::convert::Infallible>
[INFO] [stdout]   --> examples/judge.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     file: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snowchains_core` (example "judge") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> tests/yukicoder-retrieve-test-cases.rs:65:19
[INFO] [stdout]    |
[INFO] [stdout] 65 |         PrintAnsi(String),
[INFO] [stdout]    |         --------- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 65 -         PrintAnsi(String),
[INFO] [stdout] 65 +         PrintAnsi(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> tests/yukicoder-retrieve-test-cases.rs:66:14
[INFO] [stdout]    |
[INFO] [stdout] 66 |         Warn(String),
[INFO] [stdout]    |         ---- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 66 -         Warn(String),
[INFO] [stdout] 66 +         Warn(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> tests/yukicoder-retrieve-test-cases.rs:67:19
[INFO] [stdout]    |
[INFO] [stdout] 67 |         OnRequest(Method, Url),
[INFO] [stdout]    |         --------- ^^^^^^  ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 67 -         OnRequest(Method, Url),
[INFO] [stdout] 67 +         OnRequest((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> tests/yukicoder-retrieve-test-cases.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |         OnResponse(StatusCode, StatusCodeColor),
[INFO] [stdout]    |         ---------- ^^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 68 -         OnResponse(StatusCode, StatusCodeColor),
[INFO] [stdout] 68 +         OnResponse((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `CredentialsVia` is never used
[INFO] [stdout]   --> examples/yukicoder-retrieve-languages.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 | enum CredentialsVia {
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-retrieve-test-cases.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | /     #[structopt(short, long, value_name("PROBLEMS"))]
[INFO] [stdout] 36 | |     problems: Option<Vec<String>>,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-retrieve-test-cases.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     contest: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/yukicoder-submit.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     problem_no_or_index: String,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/yukicoder-submit.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     language_id: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, std::convert::Infallible>
[INFO] [stdout]   --> examples/yukicoder-submit.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     file: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-participate.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     contest: String,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/codeforces-retrieve-test-cases.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | /     #[structopt(short, long)]
[INFO] [stdout] 32 | |     problems: Option<Vec<String>>,
[INFO] [stdout]    | |_________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snowchains_core` (example "atcoder-participate") due to 1 previous error
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/yukicoder-retrieve-test-cases.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | /     #[structopt(short, long, value_name("CONTEST_ID"))]
[INFO] [stdout] 35 | |     contest: Option<String>,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/yukicoder-retrieve-test-cases.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | /     #[structopt(
[INFO] [stdout] 38 | |         short,
[INFO] [stdout] 39 | |         long,
[INFO] [stdout] 40 | |         value_name("PROBLEM_NUMBERS_OR_SLUGS_IN_CONTEST"),
[INFO] [stdout] 41 | |         required_unless("contest")
[INFO] [stdout] 42 | |     )]
[INFO] [stdout] 43 | |     problems: Option<Vec<String>>,
[INFO] [stdout]    | |_________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snowchains_core` (example "codeforces-retrieve-test-cases") due to 1 previous error
[INFO] [stderr] error: could not compile `snowchains_core` (example "yukicoder-submit") due to 3 previous errors
[INFO] [stderr] error: could not compile `snowchains_core` (example "yukicoder-retrieve-test-cases") due to 2 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/codeforces-submit.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     problem: String,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/codeforces-submit.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     language_id: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, std::convert::Infallible>
[INFO] [stdout]   --> examples/codeforces-submit.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 |     file: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-retrieve-languages.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | /     #[structopt(short, long, requires("problem"))]
[INFO] [stdout] 32 | |     contest: Option<String>,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-retrieve-languages.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | /     #[structopt(short, long, requires("contest"))]
[INFO] [stdout] 35 | |     problem: Option<String>,
[INFO] [stdout]    | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> tests/atcoder-retrieve-test-cases.rs:117:19
[INFO] [stdout]     |
[INFO] [stdout] 117 |         PrintAnsi(String),
[INFO] [stdout]     |         --------- ^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 117 -         PrintAnsi(String),
[INFO] [stdout] 117 +         PrintAnsi(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> tests/atcoder-retrieve-test-cases.rs:118:14
[INFO] [stdout]     |
[INFO] [stdout] 118 |         Warn(String),
[INFO] [stdout]     |         ---- ^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 118 -         Warn(String),
[INFO] [stdout] 118 +         Warn(()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> tests/atcoder-retrieve-test-cases.rs:119:19
[INFO] [stdout]     |
[INFO] [stdout] 119 |         OnRequest(Method, Url),
[INFO] [stdout]     |         --------- ^^^^^^  ^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 119 -         OnRequest(Method, Url),
[INFO] [stdout] 119 +         OnRequest((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> tests/atcoder-retrieve-test-cases.rs:120:20
[INFO] [stdout]     |
[INFO] [stdout] 120 |         OnResponse(StatusCode, StatusCodeColor),
[INFO] [stdout]     |         ---------- ^^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 120 -         OnResponse(StatusCode, StatusCodeColor),
[INFO] [stdout] 120 +         OnResponse((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snowchains_core` (example "codeforces-submit") due to 3 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-submit.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | /     #[structopt(long, value_name("PATH"))]
[INFO] [stdout] 37 | |     cookies: Option<PathBuf>,
[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, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-submit.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 |     contest: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-submit.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     problem: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-submit.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     language_id: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, std::convert::Infallible>
[INFO] [stdout]   --> examples/atcoder-submit.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     file: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snowchains_core` (example "atcoder-retrieve-languages") due to 2 previous errors
[INFO] [stderr] error: could not compile `snowchains_core` (example "atcoder-retrieve-test-cases") due to 2 previous errors
[INFO] [stderr] error: could not compile `snowchains_core` (example "atcoder-submit") due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "e3866e8640c99ba33d1e9b9bf1aac36b5321e77056231e60541adf23beb8ce66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3866e8640c99ba33d1e9b9bf1aac36b5321e77056231e60541adf23beb8ce66", kill_on_drop: false }`
[INFO] [stdout] e3866e8640c99ba33d1e9b9bf1aac36b5321e77056231e60541adf23beb8ce66
