[INFO] cloning repository https://github.com/sunero4/extreme-bitmap-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sunero4/extreme-bitmap-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunero4%2Fextreme-bitmap-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunero4%2Fextreme-bitmap-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 640b6269c30433b110415e29953f0c17520d1f43
[INFO] testing sunero4/extreme-bitmap-rs against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunero4%2Fextreme-bitmap-rs" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sunero4/extreme-bitmap-rs
[INFO] finished tweaking git repo https://github.com/sunero4/extreme-bitmap-rs
[INFO] tweaked toml for git repo https://github.com/sunero4/extreme-bitmap-rs written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sunero4/extreme-bitmap-rs on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sunero4/extreme-bitmap-rs 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 78c302e1d912d83674274c6dfedef200f9d7594e4ee05103bf407a50a4ebaff6
[INFO] running `Command { std: "docker" "start" "-a" "78c302e1d912d83674274c6dfedef200f9d7594e4ee05103bf407a50a4ebaff6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "78c302e1d912d83674274c6dfedef200f9d7594e4ee05103bf407a50a4ebaff6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78c302e1d912d83674274c6dfedef200f9d7594e4ee05103bf407a50a4ebaff6", kill_on_drop: false }`
[INFO] [stdout] 78c302e1d912d83674274c6dfedef200f9d7594e4ee05103bf407a50a4ebaff6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c11d8d1abf36ee7ef9c1e908721c05acfcd6c9eab8e1aa32ab98cf477aac759
[INFO] running `Command { std: "docker" "start" "-a" "2c11d8d1abf36ee7ef9c1e908721c05acfcd6c9eab8e1aa32ab98cf477aac759", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.8.0
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling extreme-bitmap-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/serialize.rs:83:37
[INFO] [stdout]    |
[INFO] [stdout] 83 | ...   let range_len_bits = if let Some (n) = input.len().checked_sub(indices_to_skip.len()) && let Some (nn) = n.checked_sub(symbol_count...
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]   --> src/serialize.rs:83:102
[INFO] [stdout]    |
[INFO] [stdout] 83 | ...en().checked_sub(indices_to_skip.len()) && let Some (nn) = n.checked_sub(symbol_counts[n]) {
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `extreme-bitmap-rs` (bin "extreme-bitmap-rs") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "2c11d8d1abf36ee7ef9c1e908721c05acfcd6c9eab8e1aa32ab98cf477aac759", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c11d8d1abf36ee7ef9c1e908721c05acfcd6c9eab8e1aa32ab98cf477aac759", kill_on_drop: false }`
[INFO] [stdout] 2c11d8d1abf36ee7ef9c1e908721c05acfcd6c9eab8e1aa32ab98cf477aac759