[INFO] fetching crate gapbuf 0.1.4...
[INFO] checking gapbuf-0.1.4 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate gapbuf 0.1.4 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate gapbuf 0.1.4 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gapbuf 0.1.4
[INFO] finished tweaking crates.io crate gapbuf 0.1.4
[INFO] tweaked toml for crates.io crate gapbuf 0.1.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate gapbuf 0.1.4 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" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 33e259f7a6498df8914998fb3aca6f34ca8262447118d807c236c9d5c5cdff1a
[INFO] running `Command { std: "docker" "start" "-a" "33e259f7a6498df8914998fb3aca6f34ca8262447118d807c236c9d5c5cdff1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33e259f7a6498df8914998fb3aca6f34ca8262447118d807c236c9d5c5cdff1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33e259f7a6498df8914998fb3aca6f34ca8262447118d807c236c9d5c5cdff1a", kill_on_drop: false }`
[INFO] [stdout] 33e259f7a6498df8914998fb3aca6f34ca8262447118d807c236c9d5c5cdff1a
[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 -Dtail_expr_drop_order" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe471932215608eb12e848fb8319933247bb52740a58e18705423929313dce49
[INFO] running `Command { std: "docker" "start" "-a" "fe471932215608eb12e848fb8319933247bb52740a58e18705423929313dce49", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.131
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking fastrand v1.8.0
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking quick-error v2.0.1
[INFO] [stderr]     Checking bit-set v0.5.3
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking gapbuf v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stdout] error: this value of type `Option<T>` has significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]    --> src/gap_buffer.rs:289:30
[INFO] [stdout]     |
[INFO] [stdout] 287 |         let mut iter = iter.into_iter();
[INFO] [stdout]     |             -------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024
[INFO] [stdout] 288 |         let min_len = iter.size_hint().0;
[INFO] [stdout] 289 |         if let Some(value) = iter.next() {
[INFO] [stdout]     |                              ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2024
[INFO] [stdout]     = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]     = note: requested on the command line with `-D tail-expr-drop-order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gapbuf` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fe471932215608eb12e848fb8319933247bb52740a58e18705423929313dce49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe471932215608eb12e848fb8319933247bb52740a58e18705423929313dce49", kill_on_drop: false }`
[INFO] [stdout] fe471932215608eb12e848fb8319933247bb52740a58e18705423929313dce49