[INFO] fetching crate try-next 0.4.0...
[INFO] checking try-next-0.4.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate try-next 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate try-next 0.4.0
[INFO] finished tweaking crates.io crate try-next 0.4.0
[INFO] tweaked toml for crates.io crate try-next 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate try-next 0.4.0 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] crate crates.io crate try-next 0.4.0 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 6767b12a0d3eccbfbe5a31009957178acf94a9773d3cfbbe240ec8c2891fa04b
[INFO] running `Command { std: "docker" "start" "-a" "6767b12a0d3eccbfbe5a31009957178acf94a9773d3cfbbe240ec8c2891fa04b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6767b12a0d3eccbfbe5a31009957178acf94a9773d3cfbbe240ec8c2891fa04b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6767b12a0d3eccbfbe5a31009957178acf94a9773d3cfbbe240ec8c2891fa04b", kill_on_drop: false }`
[INFO] [stdout] 6767b12a0d3eccbfbe5a31009957178acf94a9773d3cfbbe240ec8c2891fa04b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 71b75841dfc8926f42d1cde4ae2dd8471cc32cdec8c75b388658f44fa461e50f
[INFO] running `Command { std: "docker" "start" "-a" "71b75841dfc8926f42d1cde4ae2dd8471cc32cdec8c75b388658f44fa461e50f", kill_on_drop: false }`
[INFO] [stderr]     Checking try-next v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]    --> src/lib.rs:220:18
[INFO] [stdout]     |
[INFO] [stdout] 220 | use alloc::vec::{self, Vec};
[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: `self`
[INFO] [stdout]    --> src/lib.rs:220:18
[INFO] [stdout]     |
[INFO] [stdout] 220 | use alloc::vec::{self, Vec};
[INFO] [stdout]     |                  ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:378:71
[INFO] [stdout]     |
[INFO] [stdout] 378 |       fn try_next(&mut self) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 379 | |         Ok(self.iter.next())
[INFO] [stdout] 380 | |     }
[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<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:379:9
[INFO] [stdout]     |
[INFO] [stdout] 379 |         Ok(self.iter.next())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:394:50
[INFO] [stdout]     |
[INFO] [stdout] 394 |       ) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  __________________________________________________^
[INFO] [stdout] 395 | |         Ok(self.iter.next())
[INFO] [stdout] 396 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:395:9
[INFO] [stdout]     |
[INFO] [stdout] 395 |         Ok(self.iter.next())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `try-next` (lib) due to 4 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:378:71
[INFO] [stdout]     |
[INFO] [stdout] 378 |       fn try_next(&mut self) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________^
[INFO] [stdout] 379 | |         Ok(self.iter.next())
[INFO] [stdout] 380 | |     }
[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<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:379:9
[INFO] [stdout]     |
[INFO] [stdout] 379 |         Ok(self.iter.next())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:394:50
[INFO] [stdout]     |
[INFO] [stdout] 394 |       ) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  __________________________________________________^
[INFO] [stdout] 395 | |         Ok(self.iter.next())
[INFO] [stdout] 396 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<<I as Iterator>::Item>, Infallible>
[INFO] [stdout]    --> src/lib.rs:395:9
[INFO] [stdout]     |
[INFO] [stdout] 395 |         Ok(self.iter.next())
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:417:75
[INFO] [stdout]     |
[INFO] [stdout] 417 |           fn try_next(&mut self) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  ___________________________________________________________________________^
[INFO] [stdout] 418 | |             if self.current < self.limit {
[INFO] [stdout] 419 | |                 let v = self.current;
[INFO] [stdout] 420 | |                 self.current += 1;
[INFO] [stdout] ...   |
[INFO] [stdout] 425 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:418:13
[INFO] [stdout]     |
[INFO] [stdout] 418 | /             if self.current < self.limit {
[INFO] [stdout] 419 | |                 let v = self.current;
[INFO] [stdout] 420 | |                 self.current += 1;
[INFO] [stdout] 421 | |                 Ok(Some(v))
[INFO] [stdout] 422 | |             } else {
[INFO] [stdout] 423 | |                 Ok(None)
[INFO] [stdout] 424 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:418:42
[INFO] [stdout]     |
[INFO] [stdout] 418 |               if self.current < self.limit {
[INFO] [stdout]     |  __________________________________________^
[INFO] [stdout] 419 | |                 let v = self.current;
[INFO] [stdout] 420 | |                 self.current += 1;
[INFO] [stdout] 421 | |                 Ok(Some(v))
[INFO] [stdout] 422 | |             } else {
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:421:17
[INFO] [stdout]     |
[INFO] [stdout] 421 |                 Ok(Some(v))
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:422:20
[INFO] [stdout]     |
[INFO] [stdout] 422 |               } else {
[INFO] [stdout]     |  ____________________^
[INFO] [stdout] 423 | |                 Ok(None)
[INFO] [stdout] 424 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:423:17
[INFO] [stdout]     |
[INFO] [stdout] 423 |                 Ok(None)
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:469:20
[INFO] [stdout]     |
[INFO] [stdout] 469 |         assert_eq!(c.try_next().unwrap(), Some(0));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:470:20
[INFO] [stdout]     |
[INFO] [stdout] 470 |         assert_eq!(c.try_next().unwrap(), Some(1));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:471:20
[INFO] [stdout]     |
[INFO] [stdout] 471 |         assert_eq!(c.try_next().unwrap(), Some(2));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:472:20
[INFO] [stdout]     |
[INFO] [stdout] 472 |         assert_eq!(c.try_next().unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:475:20
[INFO] [stdout]     |
[INFO] [stdout] 475 |         assert_eq!(c.try_next().unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:485:21
[INFO] [stdout]     |
[INFO] [stdout] 485 |         let items = drain(c).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:520:54
[INFO] [stdout]     |
[INFO] [stdout] 520 |           ) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  ______________________________________________________^
[INFO] [stdout] 521 | |             ctx.calls += 1;
[INFO] [stdout] 522 | |             if self.current < self.limit {
[INFO] [stdout] 523 | |                 let v = self.current;
[INFO] [stdout] ...   |
[INFO] [stdout] 529 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:522:13
[INFO] [stdout]     |
[INFO] [stdout] 522 | /             if self.current < self.limit {
[INFO] [stdout] 523 | |                 let v = self.current;
[INFO] [stdout] 524 | |                 self.current += 1;
[INFO] [stdout] 525 | |                 Ok(Some(v))
[INFO] [stdout] 526 | |             } else {
[INFO] [stdout] 527 | |                 Ok(None)
[INFO] [stdout] 528 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:522:42
[INFO] [stdout]     |
[INFO] [stdout] 522 |               if self.current < self.limit {
[INFO] [stdout]     |  __________________________________________^
[INFO] [stdout] 523 | |                 let v = self.current;
[INFO] [stdout] 524 | |                 self.current += 1;
[INFO] [stdout] 525 | |                 Ok(Some(v))
[INFO] [stdout] 526 | |             } else {
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:525:17
[INFO] [stdout]     |
[INFO] [stdout] 525 |                 Ok(Some(v))
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:526:20
[INFO] [stdout]     |
[INFO] [stdout] 526 |               } else {
[INFO] [stdout]     |  ____________________^
[INFO] [stdout] 527 | |                 Ok(None)
[INFO] [stdout] 528 | |             }
[INFO] [stdout]     | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:527:17
[INFO] [stdout]     |
[INFO] [stdout] 527 |                 Ok(None)
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(Vec<usize>, Ctx), Infallible>
[INFO] [stdout]    --> src/lib.rs:553:28
[INFO] [stdout]     |
[INFO] [stdout] 553 |         let (items, ctx) = drain_with_ctx(src, Ctx::default()).unwrap();
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:570:20
[INFO] [stdout]     |
[INFO] [stdout] 570 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), Some(1));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:571:20
[INFO] [stdout]     |
[INFO] [stdout] 571 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), Some(2));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:572:20
[INFO] [stdout]     |
[INFO] [stdout] 572 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), Some(3));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:573:20
[INFO] [stdout]     |
[INFO] [stdout] 573 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:581:20
[INFO] [stdout]     |
[INFO] [stdout] 581 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), Some(0));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:582:20
[INFO] [stdout]     |
[INFO] [stdout] 582 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:583:20
[INFO] [stdout]     |
[INFO] [stdout] 583 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:584:20
[INFO] [stdout]     |
[INFO] [stdout] 584 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:592:20
[INFO] [stdout]     |
[INFO] [stdout] 592 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:593:20
[INFO] [stdout]     |
[INFO] [stdout] 593 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<u8>, Infallible>
[INFO] [stdout]    --> src/lib.rs:605:32
[INFO] [stdout]     |
[INFO] [stdout] 605 |         while let Some(byte) = input.try_next_with_context(&mut ctx).unwrap() {
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<u8>, Infallible>
[INFO] [stdout]    --> src/lib.rs:611:20
[INFO] [stdout]     |
[INFO] [stdout] 611 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<u8>, Infallible>
[INFO] [stdout]    --> src/lib.rs:612:20
[INFO] [stdout]     |
[INFO] [stdout] 612 |         assert_eq!(input.try_next_with_context(&mut ctx).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:642:75
[INFO] [stdout]     |
[INFO] [stdout] 642 |           fn try_next(&mut self) -> Result<Option<Self::Item>, Self::Error> {
[INFO] [stdout]     |  ___________________________________________________________________________^
[INFO] [stdout] 643 | |             self.call_count += 1;
[INFO] [stdout] 644 | |             if self.remaining == 0 {
[INFO] [stdout] 645 | |                 return Ok(None);
[INFO] [stdout] ...   |
[INFO] [stdout] 650 | |             Ok(Some(v))
[INFO] [stdout] 651 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:645:24
[INFO] [stdout]     |
[INFO] [stdout] 645 |                 return Ok(None);
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:650:13
[INFO] [stdout]     |
[INFO] [stdout] 650 |             Ok(Some(v))
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:670:20
[INFO] [stdout]     |
[INFO] [stdout] 670 |         assert_eq!(s.try_next().unwrap(), Some(0));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:671:20
[INFO] [stdout]     |
[INFO] [stdout] 671 |         assert_eq!(s.try_next().unwrap(), Some(1));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:672:20
[INFO] [stdout]     |
[INFO] [stdout] 672 |         assert_eq!(s.try_next().unwrap(), Some(2));
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<usize>, Infallible>
[INFO] [stdout]    --> src/lib.rs:673:20
[INFO] [stdout]     |
[INFO] [stdout] 673 |         assert_eq!(s.try_next().unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:682:20
[INFO] [stdout]     |
[INFO] [stdout] 682 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), Some(10));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:683:20
[INFO] [stdout]     |
[INFO] [stdout] 683 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), Some(20));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:684:20
[INFO] [stdout]     |
[INFO] [stdout] 684 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), Some(30));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:685:20
[INFO] [stdout]     |
[INFO] [stdout] 685 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:686:20
[INFO] [stdout]     |
[INFO] [stdout] 686 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), None); // fused
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:693:21
[INFO] [stdout]     |
[INFO] [stdout] 693 |         let items = input.try_collect().unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<i32>, Infallible>
[INFO] [stdout]    --> src/lib.rs:696:20
[INFO] [stdout]     |
[INFO] [stdout] 696 |         assert_eq!(TryNext::try_next(&mut input).unwrap(), None);
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `try-next` (lib test) due to 50 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "71b75841dfc8926f42d1cde4ae2dd8471cc32cdec8c75b388658f44fa461e50f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71b75841dfc8926f42d1cde4ae2dd8471cc32cdec8c75b388658f44fa461e50f", kill_on_drop: false }`
[INFO] [stdout] 71b75841dfc8926f42d1cde4ae2dd8471cc32cdec8c75b388658f44fa461e50f