[INFO] fetching crate alkahest 0.3.0...
[INFO] checking alkahest-0.3.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate alkahest 0.3.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate alkahest 0.3.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate alkahest 0.3.0
[INFO] tweaked toml for crates.io crate alkahest 0.3.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate alkahest 0.3.0 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 alkahest 0.3.0 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] f04aa055c4aa2e5f8ea8d5b9332550dab4ac465e4aef51165fa2fd3a7ddec277
[INFO] running `Command { std: "docker" "start" "-a" "f04aa055c4aa2e5f8ea8d5b9332550dab4ac465e4aef51165fa2fd3a7ddec277", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f04aa055c4aa2e5f8ea8d5b9332550dab4ac465e4aef51165fa2fd3a7ddec277", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f04aa055c4aa2e5f8ea8d5b9332550dab4ac465e4aef51165fa2fd3a7ddec277", kill_on_drop: false }`
[INFO] [stdout] f04aa055c4aa2e5f8ea8d5b9332550dab4ac465e4aef51165fa2fd3a7ddec277
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2b06d8764d4267cd3a08c560437695adfba44ab02d313003e89ba8bd37506d9c
[INFO] running `Command { std: "docker" "start" "-a" "2b06d8764d4267cd3a08c560437695adfba44ab02d313003e89ba8bd37506d9c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]     Checking alkahest v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]   --> src/buffer.rs:97:40
[INFO] [stdout]    |
[INFO] [stdout] 97 |       ) -> Result<&mut [u8], Infallible> {
[INFO] [stdout]    |  ________________________________________^
[INFO] [stdout] 98 | |         Ok(&mut [])
[INFO] [stdout] 99 | |     }
[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<&mut [u8], Infallible>
[INFO] [stdout]   --> src/buffer.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 98 |         Ok(&mut [])
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:242:40
[INFO] [stdout]     |
[INFO] [stdout] 242 |       ) -> Result<&mut [u8], Infallible> {
[INFO] [stdout]     |  ________________________________________^
[INFO] [stdout] 243 | |         debug_assert!(heap + stack <= self.len());
[INFO] [stdout] 244 | |         let end = heap + len;
[INFO] [stdout] 245 | |         Ok(&mut self[..end])
[INFO] [stdout] 246 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:245:9
[INFO] [stdout]     |
[INFO] [stdout] 245 |         Ok(&mut self[..end])
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:322:40
[INFO] [stdout]     |
[INFO] [stdout] 322 |       ) -> Result<&mut [u8], Infallible> {
[INFO] [stdout]     |  ________________________________________^
[INFO] [stdout] 323 | |         if !*self.exhausted {
[INFO] [stdout] 324 | |             debug_assert!(heap + stack <= self.buf.len());
[INFO] [stdout] 325 | |             if self.buf.len() - heap - stack < len {
[INFO] [stdout] ...   |
[INFO] [stdout] 336 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:330:9
[INFO] [stdout]     |
[INFO] [stdout] 330 | /         if *self.exhausted {
[INFO] [stdout] 331 | |             Ok(&mut [])
[INFO] [stdout] 332 | |         } else {
[INFO] [stdout] 333 | |             let end = heap + len;
[INFO] [stdout] 334 | |             Ok(&mut self.buf[..end])
[INFO] [stdout] 335 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:330:28
[INFO] [stdout]     |
[INFO] [stdout] 330 |           if *self.exhausted {
[INFO] [stdout]     |  ____________________________^
[INFO] [stdout] 331 | |             Ok(&mut [])
[INFO] [stdout] 332 | |         } else {
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:331:13
[INFO] [stdout]     |
[INFO] [stdout] 331 |             Ok(&mut [])
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:332:16
[INFO] [stdout]     |
[INFO] [stdout] 332 |           } else {
[INFO] [stdout]     |  ________________^
[INFO] [stdout] 333 | |             let end = heap + len;
[INFO] [stdout] 334 | |             Ok(&mut self.buf[..end])
[INFO] [stdout] 335 | |         }
[INFO] [stdout]     | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:334:13
[INFO] [stdout]     |
[INFO] [stdout] 334 |             Ok(&mut self.buf[..end])
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:421:40
[INFO] [stdout]     |
[INFO] [stdout] 421 |       ) -> Result<&mut [u8], Infallible> {
[INFO] [stdout]     |  ________________________________________^
[INFO] [stdout] 422 | |         debug_assert!(heap + stack <= self.buf.len());
[INFO] [stdout] 423 | |         self.reserve(heap, stack, len);
[INFO] [stdout] 424 | |         Ok(&mut self.buf[..heap + len])
[INFO] [stdout] 425 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&mut [u8], Infallible>
[INFO] [stdout]    --> src/buffer.rs:424:9
[INFO] [stdout]     |
[INFO] [stdout] 424 |         Ok(&mut self.buf[..heap + len])
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/packet.rs:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 |     match write_packet_into(value, DryBuffer) {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/packet.rs:86:11
[INFO] [stdout]    |
[INFO] [stdout] 86 |     match write_packet_into::<F, T, _>(value, output) {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/packet.rs:106:11
[INFO] [stdout]     |
[INFO] [stdout] 106 |     match write_packet_into::<F, T, _>(value, VecBuffer::new(output)) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking getrandom v0.2.8
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/primitive.rs:160:56
[INFO] [stdout]     |
[INFO] [stdout] 160 |         <u8 as Serialize<u8>>::serialize(u8::from(*self.borrow()), sizes, buffer)
[INFO] [stdout]     |                                                        ^^^^^^^^^ help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `bool` does not implement `Borrow`, so calling `borrow` on `&bool` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(usize, usize), Infallible>
[INFO] [stdout]    --> src/serialize.rs:353:11
[INFO] [stdout]     |
[INFO] [stdout] 353 |     match serialize_into::<F, T, _>(value, output) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(usize, usize), Infallible>
[INFO] [stdout]    --> src/serialize.rs:399:18
[INFO] [stdout]     |
[INFO] [stdout] 399 |     let result = serialize_into::<F, T, _>(value, MaybeFixedBuffer::new(output, &mut exhausted));
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(usize, usize), Infallible>
[INFO] [stdout]    --> src/serialize.rs:400:23
[INFO] [stdout]     |
[INFO] [stdout] 400 |     let sizes = match result {
[INFO] [stdout]     |                       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(usize, usize), Infallible>
[INFO] [stdout]    --> src/serialize.rs:425:11
[INFO] [stdout]     |
[INFO] [stdout] 425 |     match serialize_into::<F, T, _>(value, VecBuffer::new(output)) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/serialize.rs:641:25
[INFO] [stdout]     |
[INFO] [stdout] 641 |             [] => match write_ref_slow(value, sizes, DryBuffer) {
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `alkahest` (lib) due to 20 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2b06d8764d4267cd3a08c560437695adfba44ab02d313003e89ba8bd37506d9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b06d8764d4267cd3a08c560437695adfba44ab02d313003e89ba8bd37506d9c", kill_on_drop: false }`
[INFO] [stdout] 2b06d8764d4267cd3a08c560437695adfba44ab02d313003e89ba8bd37506d9c