[INFO] fetching crate once_cell_serde 1.20.3...
[INFO] checking once_cell_serde-1.20.3 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate once_cell_serde 1.20.3 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate once_cell_serde 1.20.3
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate once_cell_serde 1.20.3
[INFO] tweaked toml for crates.io crate once_cell_serde 1.20.3 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate once_cell_serde 1.20.3 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 once_cell_serde 1.20.3 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] cd2a5f4aedd33705491a257b73c6de9be38f84f698ab88bc6bdc93932da4f297
[INFO] running `Command { std: "docker" "start" "-a" "cd2a5f4aedd33705491a257b73c6de9be38f84f698ab88bc6bdc93932da4f297", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd2a5f4aedd33705491a257b73c6de9be38f84f698ab88bc6bdc93932da4f297", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd2a5f4aedd33705491a257b73c6de9be38f84f698ab88bc6bdc93932da4f297", kill_on_drop: false }`
[INFO] [stdout] cd2a5f4aedd33705491a257b73c6de9be38f84f698ab88bc6bdc93932da4f297
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] edc69a998b9875ff7b71f181ba78386c9d527edf6da513c64d76e191656fd635
[INFO] running `Command { std: "docker" "start" "-a" "edc69a998b9875ff7b71f181ba78386c9d527edf6da513c64d76e191656fd635", kill_on_drop: false }`
[INFO] [stderr]     Checking critical-section v1.2.0
[INFO] [stderr]     Checking once_cell_serde v1.20.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stdout] error: this type will no longer be must used: Result<&T, unsync::OnceCell<T>::get_or_init::Void>
[INFO] [stdout]    --> src/lib.rs:594:19
[INFO] [stdout]     |
[INFO] [stdout] 594 |             match self.get_or_try_init(|| Ok::<T, Void>(f())) {
[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<&T, sync::OnceCell<T>::get_or_init::Void>
[INFO] [stdout]     --> src/lib.rs:1123:19
[INFO] [stdout]      |
[INFO] [stdout] 1123 |             match self.get_or_try_init(|| Ok::<T, Void>(f())) {
[INFO] [stdout]      |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<NonZero<usize>, OnceNonZeroUsize::get_or_init::Void>
[INFO] [stdout]   --> src/race.rs:78:15
[INFO] [stdout]    |
[INFO] [stdout] 78 |         match self.get_or_try_init(|| Ok::<NonZeroUsize, Void>(f())) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<NonZero<usize>, OnceNonZeroUsize::get_or_init::Void>
[INFO] [stdout]   --> src/race.rs:78:39
[INFO] [stdout]    |
[INFO] [stdout] 78 |         match self.get_or_try_init(|| Ok::<NonZeroUsize, Void>(f())) {
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, OnceRef<'a, T>::get_or_init::Void>
[INFO] [stdout]    --> src/race.rs:236:15
[INFO] [stdout]     |
[INFO] [stdout] 236 |         match self.get_or_try_init(|| Ok::<&'a T, Void>(f())) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, OnceRef<'a, T>::get_or_init::Void>
[INFO] [stdout]    --> src/race.rs:236:39
[INFO] [stdout]     |
[INFO] [stdout] 236 |         match self.get_or_try_init(|| Ok::<&'a T, Void>(f())) {
[INFO] [stdout]     |                                       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, OnceBox<T>::get_or_init::Void>
[INFO] [stdout]    --> src/race.rs:372:19
[INFO] [stdout]     |
[INFO] [stdout] 372 |             match self.get_or_try_init(|| Ok::<Box<T>, Void>(f())) {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Box<T>, OnceBox<T>::get_or_init::Void>
[INFO] [stdout]    --> src/race.rs:372:43
[INFO] [stdout]     |
[INFO] [stdout] 372 |             match self.get_or_try_init(|| Ok::<Box<T>, Void>(f())) {
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `once_cell_serde` (lib) due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "edc69a998b9875ff7b71f181ba78386c9d527edf6da513c64d76e191656fd635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edc69a998b9875ff7b71f181ba78386c9d527edf6da513c64d76e191656fd635", kill_on_drop: false }`
[INFO] [stdout] edc69a998b9875ff7b71f181ba78386c9d527edf6da513c64d76e191656fd635