[INFO] fetching crate mmapio 0.9.1... [INFO] checking mmapio-0.9.1 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930 [INFO] extracting crate mmapio 0.9.1 into /workspace/builds/worker-4-tc2/source [INFO] validating manifest of crates.io crate mmapio 0.9.1 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 mmapio 0.9.1 [INFO] finished tweaking crates.io crate mmapio 0.9.1 [INFO] tweaked toml for crates.io crate mmapio 0.9.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] crate crates.io crate mmapio 0.9.1 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] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 8ad671259658a657cac539f41cf7a61c55e09de177341bb4bd71ba92cfe75ae1 [INFO] running `Command { std: "docker" "start" "-a" "8ad671259658a657cac539f41cf7a61c55e09de177341bb4bd71ba92cfe75ae1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8ad671259658a657cac539f41cf7a61c55e09de177341bb4bd71ba92cfe75ae1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8ad671259658a657cac539f41cf7a61c55e09de177341bb4bd71ba92cfe75ae1", kill_on_drop: false }` [INFO] [stdout] 8ad671259658a657cac539f41cf7a61c55e09de177341bb4bd71ba92cfe75ae1 [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 -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] 85bfdef537236e8581aa82e45bb57849b6e1635b2979e4e348e4510b2997117f [INFO] running `Command { std: "docker" "start" "-a" "85bfdef537236e8581aa82e45bb57849b6e1635b2979e4e348e4510b2997117f", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.86 [INFO] [stderr] Checking remove_dir_all v0.5.3 [INFO] [stderr] Checking rand v0.4.6 [INFO] [stderr] Checking mmapio v0.9.1 (/opt/rustwide/workdir) [INFO] [stderr] Checking tempdir v0.3.7 [INFO] [stdout] warning: unused variable: `path` [INFO] [stdout] --> src/lib.rs:1199:13 [INFO] [stdout] | [INFO] [stdout] 1199 | let path = tempdir.path().join("mmap"); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_path` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `MmapMut` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/lib.rs:1211:17 [INFO] [stdout] | [INFO] [stdout] 1198 | let tempdir = tempdir::TempDir::new("mmap").unwrap(); [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 1202 | let mut file = OpenOptions::new() [INFO] [stdout] | -------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 1211 | let mut mmap = opt [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: requested on the command line with `-D tail-expr-drop-order` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:1202:13 [INFO] [stdout] | [INFO] [stdout] 1202 | let mut file = OpenOptions::new() [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:1223:17 [INFO] [stdout] | [INFO] [stdout] 1223 | let mut file = OpenOptions::new() [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/lib.rs:866:9 [INFO] [stdout] | [INFO] [stdout] 866 | file.set_len(0); [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 866 | let _ = file.set_len(0); [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused borrow that must be used [INFO] [stdout] --> src/lib.rs:1042:13 [INFO] [stdout] | [INFO] [stdout] 1042 | &mmap[..]; [INFO] [stdout] | ^^^^^^^^^ the borrow produces a value [INFO] [stdout] | [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 1042 | let _ = &mmap[..]; [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error; 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `mmapio` (lib test) due to 2 previous errors; 5 warnings emitted [INFO] running `Command { std: "docker" "inspect" "85bfdef537236e8581aa82e45bb57849b6e1635b2979e4e348e4510b2997117f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "85bfdef537236e8581aa82e45bb57849b6e1635b2979e4e348e4510b2997117f", kill_on_drop: false }` [INFO] [stdout] 85bfdef537236e8581aa82e45bb57849b6e1635b2979e4e348e4510b2997117f