[INFO] fetching crate tuple 0.5.2... [INFO] checking tuple-0.5.2 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930 [INFO] extracting crate tuple 0.5.2 into /workspace/builds/worker-5-tc2/source [INFO] validating manifest of crates.io crate tuple 0.5.2 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 tuple 0.5.2 [INFO] finished tweaking crates.io crate tuple 0.5.2 [INFO] tweaked toml for crates.io crate tuple 0.5.2 written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 8 packages to latest compatible versions [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] warning: no edition set: defaulting to the 2015 edition while the latest is 2021 [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] f9cd645361c3155adecf4eef4a008676cf349e91bb25d7af5f65fe0779306acb [INFO] running `Command { std: "docker" "start" "-a" "f9cd645361c3155adecf4eef4a008676cf349e91bb25d7af5f65fe0779306acb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "f9cd645361c3155adecf4eef4a008676cf349e91bb25d7af5f65fe0779306acb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f9cd645361c3155adecf4eef4a008676cf349e91bb25d7af5f65fe0779306acb", kill_on_drop: false }` [INFO] [stdout] f9cd645361c3155adecf4eef4a008676cf349e91bb25d7af5f65fe0779306acb [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] 6f750038603eab0ff5481a6da6903ec00d6241034c216ac5c1fbb6214fb62815 [INFO] running `Command { std: "docker" "start" "-a" "6f750038603eab0ff5481a6da6903ec00d6241034c216ac5c1fbb6214fb62815", kill_on_drop: false }` [INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021 [INFO] [stderr] Checking tuple v0.5.2 (/opt/rustwide/workdir) [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [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] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option

, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 16 previous errors [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `tuple` (lib test) due to 17 previous errors [INFO] running `Command { std: "docker" "inspect" "6f750038603eab0ff5481a6da6903ec00d6241034c216ac5c1fbb6214fb62815", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6f750038603eab0ff5481a6da6903ec00d6241034c216ac5c1fbb6214fb62815", kill_on_drop: false }` [INFO] [stdout] 6f750038603eab0ff5481a6da6903ec00d6241034c216ac5c1fbb6214fb62815

, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 16 previous errors [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `tuple` (lib) due to 17 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [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] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option<()>)` has significant drop implementation that will have a different drop order from that of Edition 2021 [INFO] [stdout] --> src/m_serde.rs:36:31 [INFO] [stdout] | [INFO] [stdout] 31 | fn visit_seq(self, mut seq: A) -> Result [INFO] [stdout] | ------- these local bindings with significant drop implementation may observe changes in drop order under Edition 2024 [INFO] [stdout] ... [INFO] [stdout] 36 | match ($($t,)* seq.next_element::<()>()?) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 49 | impl_tuple!(impl_serde); [INFO] [stdout] | ----------------------- in this macro invocation [INFO] [stdout] | [INFO] [stdout] = warning: this changes meaning in Rust 2024 [INFO] [stdout] = note: for more information, see issue #123739 [INFO] [stdout] = note: this error originates in the macro `impl_serde` which comes from the expansion of the macro `impl_tuple` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this value of type `(std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option, std::option::Option