[INFO] fetching crate arg_combinators 0.6.0...
[INFO] checking arg_combinators-0.6.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate arg_combinators 0.6.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate arg_combinators 0.6.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate arg_combinators 0.6.0
[INFO] tweaked toml for crates.io crate arg_combinators 0.6.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate arg_combinators 0.6.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[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] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[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] 81d205e9c7fda29d1a1494958a3e8697fa0d8613ca8e4dabff331e7681434244
[INFO] running `Command { std: "docker" "start" "-a" "81d205e9c7fda29d1a1494958a3e8697fa0d8613ca8e4dabff331e7681434244", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81d205e9c7fda29d1a1494958a3e8697fa0d8613ca8e4dabff331e7681434244", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81d205e9c7fda29d1a1494958a3e8697fa0d8613ca8e4dabff331e7681434244", kill_on_drop: false }`
[INFO] [stdout] 81d205e9c7fda29d1a1494958a3e8697fa0d8613ca8e4dabff331e7681434244
[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] 23c75ef1930c589d6680dd1dfad469e7b0fbd28d84ce6468c5a1447e582b5379
[INFO] running `Command { std: "docker" "start" "-a" "23c75ef1930c589d6680dd1dfad469e7b0fbd28d84ce6468c5a1447e582b5379", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]     Checking unicode-width v0.2.2
[INFO] [stderr]     Checking getopts v0.2.24
[INFO] [stderr]     Checking arg_combinators v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<bool, util::Never>
[INFO] [stdout]    --> src/arg.rs:297:73
[INFO] [stdout]     |
[INFO] [stdout] 297 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 298 | |         Ok(matches.opt_present(self.common.long.as_str()))
[INFO] [stdout] 299 | |     }
[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<bool, util::Never>
[INFO] [stdout]    --> src/arg.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |         Ok(matches.opt_present(self.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:330:73
[INFO] [stdout]     |
[INFO] [stdout] 330 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 331 | |         Ok(matches.opt_str(self.common.long.as_str()))
[INFO] [stdout] 332 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |         Ok(matches.opt_str(self.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, util::Never>
[INFO] [stdout]    --> src/arg.rs:356:73
[INFO] [stdout]     |
[INFO] [stdout] 356 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 357 | |         Ok(matches.opt_count(self.flag.common.long.as_str()))
[INFO] [stdout] 358 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, util::Never>
[INFO] [stdout]    --> src/arg.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 |         Ok(matches.opt_count(self.flag.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:387:73
[INFO] [stdout]     |
[INFO] [stdout] 387 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 388 | |         Ok(matches.opt_strs(self.opt.common.long.as_str()))
[INFO] [stdout] 389 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:388:9
[INFO] [stdout]     |
[INFO] [stdout] 388 |         Ok(matches.opt_strs(self.opt.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:401:73
[INFO] [stdout]     |
[INFO] [stdout] 401 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 402 | |         Ok(matches.free.clone())
[INFO] [stdout] 403 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 402 |         Ok(matches.free.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<<A as arg::Arg>::Item, <A as arg::Arg>::Error>, Result<<B as arg::Arg>::Item, <B as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:189:73
[INFO] [stdout]     |
[INFO] [stdout] 189 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 190 | |         Ok((self.a.get(matches), self.b.get(matches)))
[INFO] [stdout] 191 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mustuse_in_always_ok)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<<A as arg::Arg>::Item, <A as arg::Arg>::Error>, Result<<B as arg::Arg>::Item, <B as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:190:9
[INFO] [stdout]     |
[INFO] [stdout] 190 |         Ok((self.a.get(matches), self.b.get(matches)))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<Option<T>, <A as arg::Arg>::Error>, Result<<U as arg::Arg>::Item, <U as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:697:43
[INFO] [stdout]     |
[INFO] [stdout] 697 |             let (a, b) = Never::result_ok(r);
[INFO] [stdout]     |                                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<bool, <A as arg::Arg>::Error>, Result<<U as arg::Arg>::Item, <U as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:797:43
[INFO] [stdout]     |
[INFO] [stdout] 797 |             let (a, b) = Never::result_ok(r);
[INFO] [stdout]     |                                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arg_combinators` (lib) due to 10 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<bool, util::Never>
[INFO] [stdout]    --> src/arg.rs:297:73
[INFO] [stdout]     |
[INFO] [stdout] 297 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 298 | |         Ok(matches.opt_present(self.common.long.as_str()))
[INFO] [stdout] 299 | |     }
[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<bool, util::Never>
[INFO] [stdout]    --> src/arg.rs:298:9
[INFO] [stdout]     |
[INFO] [stdout] 298 |         Ok(matches.opt_present(self.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:330:73
[INFO] [stdout]     |
[INFO] [stdout] 330 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 331 | |         Ok(matches.opt_str(self.common.long.as_str()))
[INFO] [stdout] 332 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |         Ok(matches.opt_str(self.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, util::Never>
[INFO] [stdout]    --> src/arg.rs:356:73
[INFO] [stdout]     |
[INFO] [stdout] 356 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 357 | |         Ok(matches.opt_count(self.flag.common.long.as_str()))
[INFO] [stdout] 358 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, util::Never>
[INFO] [stdout]    --> src/arg.rs:357:9
[INFO] [stdout]     |
[INFO] [stdout] 357 |         Ok(matches.opt_count(self.flag.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:387:73
[INFO] [stdout]     |
[INFO] [stdout] 387 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 388 | |         Ok(matches.opt_strs(self.opt.common.long.as_str()))
[INFO] [stdout] 389 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:388:9
[INFO] [stdout]     |
[INFO] [stdout] 388 |         Ok(matches.opt_strs(self.opt.common.long.as_str()))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:401:73
[INFO] [stdout]     |
[INFO] [stdout] 401 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 402 | |         Ok(matches.free.clone())
[INFO] [stdout] 403 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<String>, util::Never>
[INFO] [stdout]    --> src/arg.rs:402:9
[INFO] [stdout]     |
[INFO] [stdout] 402 |         Ok(matches.free.clone())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<<A as arg::Arg>::Item, <A as arg::Arg>::Error>, Result<<B as arg::Arg>::Item, <B as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:189:73
[INFO] [stdout]     |
[INFO] [stdout] 189 |       fn get(&self, matches: &Matches) -> Result<Self::Item, Self::Error> {
[INFO] [stdout]     |  _________________________________________________________________________^
[INFO] [stdout] 190 | |         Ok((self.a.get(matches), self.b.get(matches)))
[INFO] [stdout] 191 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mustuse_in_always_ok)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<<A as arg::Arg>::Item, <A as arg::Arg>::Error>, Result<<B as arg::Arg>::Item, <B as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:190:9
[INFO] [stdout]     |
[INFO] [stdout] 190 |         Ok((self.a.get(matches), self.b.get(matches)))
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<Option<T>, <A as arg::Arg>::Error>, Result<<U as arg::Arg>::Item, <U as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:697:43
[INFO] [stdout]     |
[INFO] [stdout] 697 |             let (a, b) = Never::result_ok(r);
[INFO] [stdout]     |                                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this type continue be must used: Result<(Result<bool, <A as arg::Arg>::Error>, Result<<U as arg::Arg>::Item, <U as arg::Arg>::Error>), util::Never>
[INFO] [stdout]    --> src/ext.rs:797:43
[INFO] [stdout]     |
[INFO] [stdout] 797 |             let (a, b) = Never::result_ok(r);
[INFO] [stdout]     |                                           ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arg_combinators` (lib test) due to 10 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "23c75ef1930c589d6680dd1dfad469e7b0fbd28d84ce6468c5a1447e582b5379", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23c75ef1930c589d6680dd1dfad469e7b0fbd28d84ce6468c5a1447e582b5379", kill_on_drop: false }`
[INFO] [stdout] 23c75ef1930c589d6680dd1dfad469e7b0fbd28d84ce6468c5a1447e582b5379