[INFO] fetching crate polars-utils 0.52.0...
[INFO] checking polars-utils-0.52.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate polars-utils 0.52.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate polars-utils 0.52.0
[INFO] finished tweaking crates.io crate polars-utils 0.52.0
[INFO] tweaked toml for crates.io crate polars-utils 0.52.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate polars-utils 0.52.0 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 polars-utils 0.52.0 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] f0975e67a6eb65d29c03aecc6d780be95bae0464451ae9ba40f17fd9dfcedf8e
[INFO] running `Command { std: "docker" "start" "-a" "f0975e67a6eb65d29c03aecc6d780be95bae0464451ae9ba40f17fd9dfcedf8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0975e67a6eb65d29c03aecc6d780be95bae0464451ae9ba40f17fd9dfcedf8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0975e67a6eb65d29c03aecc6d780be95bae0464451ae9ba40f17fd9dfcedf8e", kill_on_drop: false }`
[INFO] [stdout] f0975e67a6eb65d29c03aecc6d780be95bae0464451ae9ba40f17fd9dfcedf8e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 275b2efb877fb7e20ffa5c214432a0e5165d534d116e71c1611395eea97491d4
[INFO] running `Command { std: "docker" "start" "-a" "275b2efb877fb7e20ffa5c214432a0e5165d534d116e71c1611395eea97491d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling cc v1.2.28
[INFO] [stderr]    Compiling signal-hook v0.3.18
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]     Checking foldhash v0.2.0
[INFO] [stderr]     Checking castaway v0.2.3
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling polars-utils v0.52.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking simdutf8 v0.1.5
[INFO] [stderr]     Checking rand_xorshift v0.4.0
[INFO] [stderr]     Checking raw-cpuid v11.5.0
[INFO] [stderr]     Checking rayon v1.10.0
[INFO] [stderr]     Checking uuid v1.17.0
[INFO] [stderr]     Checking proptest v1.7.0
[INFO] [stderr]     Checking polars-error v0.52.0
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]    Compiling psm v0.1.26
[INFO] [stderr]    Compiling stacker v0.1.21
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling bytemuck_derive v1.9.3
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stderr]     Checking bytemuck v1.23.1
[INFO] [stderr]     Checking hashbrown v0.16.0
[INFO] [stderr]     Checking compact_str v0.9.0
[INFO] [stderr]     Checking indexmap v2.12.0
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&mut V, Never>
[INFO] [stdout]    --> src/cache.rs:182:23
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let Ok(ret) = self.try_get_or_insert_with::<Q, Never, _>(key, |k| Ok(f(k)));
[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 `polars-utils` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<&mut V, Never>
[INFO] [stdout]    --> src/cache.rs:182:23
[INFO] [stdout]     |
[INFO] [stdout] 182 |         let Ok(ret) = self.try_get_or_insert_with::<Q, Never, _>(key, |k| Ok(f(k)));
[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 `polars-utils` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "275b2efb877fb7e20ffa5c214432a0e5165d534d116e71c1611395eea97491d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "275b2efb877fb7e20ffa5c214432a0e5165d534d116e71c1611395eea97491d4", kill_on_drop: false }`
[INFO] [stdout] 275b2efb877fb7e20ffa5c214432a0e5165d534d116e71c1611395eea97491d4