[INFO] fetching crate ouroboros_examples 0.18.4... [INFO] checking ouroboros_examples-0.18.4 against try#4d98531622e1718ae0bc3c7a1ab9cd8938428452+rustflags=-Dtail_expr_drop_order for pr-129604 [INFO] extracting crate ouroboros_examples 0.18.4 into /workspace/builds/worker-3-tc2/source [INFO] validating manifest of crates.io crate ouroboros_examples 0.18.4 on toolchain 4d98531622e1718ae0bc3c7a1ab9cd8938428452 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate ouroboros_examples 0.18.4 [INFO] finished tweaking crates.io crate ouroboros_examples 0.18.4 [INFO] tweaked toml for crates.io crate ouroboros_examples 0.18.4 written to /workspace/builds/worker-3-tc2/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 52 packages to latest compatible versions [INFO] [stderr] Adding addr2line v0.22.0 (latest: v0.24.1) [INFO] [stderr] Adding gimli v0.29.0 (latest: v0.31.0) [INFO] [stderr] Adding heck v0.4.1 (latest: v0.5.0) [INFO] [stderr] Adding itertools v0.12.1 (latest: v0.13.0) [INFO] [stderr] Adding miniz_oxide v0.7.4 (latest: v0.8.0) [INFO] [stderr] Adding trybuild v1.0.85 (latest: v1.0.99) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 31942b59ece8b0a0b606819d96b3bc2b5b0167b82c0d55c89a9e5ba840006c6d [INFO] running `Command { std: "docker" "start" "-a" "31942b59ece8b0a0b606819d96b3bc2b5b0167b82c0d55c89a9e5ba840006c6d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "31942b59ece8b0a0b606819d96b3bc2b5b0167b82c0d55c89a9e5ba840006c6d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "31942b59ece8b0a0b606819d96b3bc2b5b0167b82c0d55c89a9e5ba840006c6d", kill_on_drop: false }` [INFO] [stdout] 31942b59ece8b0a0b606819d96b3bc2b5b0167b82c0d55c89a9e5ba840006c6d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+4d98531622e1718ae0bc3c7a1ab9cd8938428452" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 391d79259936ab6180051a85d1572151725c2f73d26e7cf48de8c0739e7aaa7e [INFO] running `Command { std: "docker" "start" "-a" "391d79259936ab6180051a85d1572151725c2f73d26e7cf48de8c0739e7aaa7e", kill_on_drop: false }` [INFO] [stderr] Compiling syn v2.0.77 [INFO] [stderr] Compiling proc-macro2-diagnostics v0.10.1 [INFO] [stderr] Compiling yansi v1.0.1 [INFO] [stderr] Compiling serde v1.0.209 [INFO] [stderr] Compiling itertools v0.12.1 [INFO] [stderr] Compiling trybuild v1.0.85 [INFO] [stderr] Checking aliasable v0.1.3 [INFO] [stderr] Checking glob v0.3.1 [INFO] [stderr] Checking serde_json v1.0.127 [INFO] [stderr] Checking basic-toml v0.1.9 [INFO] [stderr] Compiling ouroboros_macro v0.18.4 [INFO] [stderr] Compiling serde_derive v1.0.209 [INFO] [stderr] Compiling tokio-macros v2.4.0 [INFO] [stderr] Checking tokio v1.40.0 [INFO] [stderr] Checking ouroboros v0.18.4 [INFO] [stderr] Checking ouroboros_examples v0.18.4 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/lib.rs:11:43 [INFO] [stdout] | [INFO] [stdout] 11 | pub struct Ext<'this, T, const REV: bool>(&'this Box); [INFO] [stdout] | --- field in this struct ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/lib.rs:11:43 [INFO] [stdout] | [INFO] [stdout] 11 | pub struct Ext<'this, T, const REV: bool>(&'this Box); [INFO] [stdout] | --- field in this struct ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: consider removing this field [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/ok_tests.rs:107:39 [INFO] [stdout] | [INFO] [stdout] 107 | dref_builder: |data| Box::pin(async move { data }), [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] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/ok_tests.rs:122:39 [INFO] [stdout] | [INFO] [stdout] 122 | dref_builder: |data| Box::pin(async move { Result::<_, ()>::Ok(data) }), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/ok_tests.rs:138:40 [INFO] [stdout] | [INFO] [stdout] 138 | dref_builder: |_data| Box::pin(async move { Err(56u64) }), [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/ok_tests.rs:259:5 [INFO] [stdout] | [INFO] [stdout] 259 | drop(instance.borrow_external()); [INFO] [stdout] | ^^^^^--------------------------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&&str` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 259 - drop(instance.borrow_external()); [INFO] [stdout] 259 + let _ = instance.borrow_external(); [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/ok_tests.rs:260:5 [INFO] [stdout] | [INFO] [stdout] 260 | drop(instance.borrow_internal()); [INFO] [stdout] | ^^^^^--------------------------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&&&str` [INFO] [stdout] | [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 260 - drop(instance.borrow_internal()); [INFO] [stdout] 260 + let _ = instance.borrow_internal(); [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 3 previous errors; 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `ouroboros_examples` (lib test) due to 4 previous errors; 3 warnings emitted [INFO] running `Command { std: "docker" "inspect" "391d79259936ab6180051a85d1572151725c2f73d26e7cf48de8c0739e7aaa7e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "391d79259936ab6180051a85d1572151725c2f73d26e7cf48de8c0739e7aaa7e", kill_on_drop: false }` [INFO] [stdout] 391d79259936ab6180051a85d1572151725c2f73d26e7cf48de8c0739e7aaa7e