[INFO] fetching crate structural 0.4.3...
[INFO] testing structural-0.4.3 against try#33835004928d3bf65db4d4712e1330766263b0bd for pr-155739-1
[INFO] extracting crate structural 0.4.3 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate structural 0.4.3
[INFO] finished tweaking crates.io crate structural 0.4.3
[INFO] tweaked toml for crates.io crate structural 0.4.3 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate structural 0.4.3 on toolchain 33835004928d3bf65db4d4712e1330766263b0bd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] [stderr]       Adding core_extensions v0.1.20 (available: v1.5.4)
[INFO] [stderr]       Adding rustc_version v0.2.3 (available: v0.4.1)
[INFO] [stderr]       Adding typed-arena v1.5.0 (available: v1.7.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
[INFO] [stderr] (in the `core_extensions` dependency)
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2e70bf098ce5bcf8af63c8b1d9b68faaa782fc92ffb58149c115b881f66ee5b
[INFO] running `Command { std: "docker" "start" "-a" "b2e70bf098ce5bcf8af63c8b1d9b68faaa782fc92ffb58149c115b881f66ee5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2e70bf098ce5bcf8af63c8b1d9b68faaa782fc92ffb58149c115b881f66ee5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2e70bf098ce5bcf8af63c8b1d9b68faaa782fc92ffb58149c115b881f66ee5b", kill_on_drop: false }`
[INFO] [stdout] b2e70bf098ce5bcf8af63c8b1d9b68faaa782fc92ffb58149c115b881f66ee5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c8419bd14892376ab1e8433ca7428f2feec4ffadc5c89f9c7dc78245e8388b8
[INFO] running `Command { std: "docker" "start" "-a" "7c8419bd14892376ab1e8433ca7428f2feec4ffadc5c89f9c7dc78245e8388b8", kill_on_drop: false }`
[INFO] [stderr] warning: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
[INFO] [stderr] (in the `core_extensions` dependency)
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling typed-arena v1.5.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling core_extensions v0.1.20
[INFO] [stderr]    Compiling as_derive_utils v0.8.3
[INFO] [stderr]    Compiling structural_derive v0.4.3
[INFO] [stderr]    Compiling structural v0.4.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:778:41
[INFO] [stdout]     |
[INFO] [stdout] 778 | #[cfg(any(feature = "for_examples", all(rust_1_41, doc)))]
[INFO] [stdout]     |                                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: expected names are: `docsrs`, `feature`, and `test` and 32 more
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:784:50
[INFO] [stdout]     |
[INFO] [stdout] 784 | #[cfg(all(not(feature = "for_examples"), not(all(rust_1_41, doc))))]
[INFO] [stdout]     |                                                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fp`
[INFO] [stdout]  --> src/field/most_impls.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::{fp, FieldType, GetField, IntoField, Structural};
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:135:11
[INFO] [stdout]     |
[INFO] [stdout] 135 |     #[cfg(feature = "rust_1_42")]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:139:15
[INFO] [stdout]     |
[INFO] [stdout] 139 |     #[cfg(not(feature = "rust_1_42"))]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/utils.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn drop(&mut self) {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 40 |     }
[INFO] [stdout]    |     - recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `InfinitePanic` is never constructed
[INFO] [stdout]   --> src/utils.rs:34:19
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub(crate) struct InfinitePanic;
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/enums/variant_proxy.rs:562:5
[INFO] [stdout]     |
[INFO] [stdout] 562 | /     default_if! {
[INFO] [stdout] 563 | |         #[inline(always)]
[INFO] [stdout] 564 | |         cfg(feature="specialization")
[INFO] [stdout] 565 | |         unsafe fn get_field_raw_mut_inner(
[INFO] [stdout] ...   |
[INFO] [stdout] 581 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 | /     unsafe_delegate_structural_with! {
[INFO] [stdout] 242 | |         impl[T,] Box<T>
[INFO] [stdout] 243 | |         where[T:?Sized,]
[INFO] [stdout] ...   |
[INFO] [stdout] 263 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 | /     unsafe_delegate_structural_with! {
[INFO] [stdout] 242 | |         impl[T,] Box<T>
[INFO] [stdout] 243 | |         where[T:?Sized,]
[INFO] [stdout] ...   |
[INFO] [stdout] 263 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:345:1
[INFO] [stdout]     |
[INFO] [stdout] 345 | / unsafe_delegate_structural_with! {
[INFO] [stdout] 346 | |     impl['a,T:'a,] &'a mut T
[INFO] [stdout] 347 | |     where [T:?Sized,]
[INFO] [stdout] 348 | |     self_ident=this;
[INFO] [stdout] ...   |
[INFO] [stdout] 360 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:345:1
[INFO] [stdout]     |
[INFO] [stdout] 345 | / unsafe_delegate_structural_with! {
[INFO] [stdout] 346 | |     impl['a,T:'a,] &'a mut T
[INFO] [stdout] 347 | |     where [T:?Sized,]
[INFO] [stdout] 348 | |     self_ident=this;
[INFO] [stdout] ...   |
[INFO] [stdout] 360 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]   --> src/macros.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |           default $($default_impl)*
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/field/rev_get_field/components.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 | /     default_if! {
[INFO] [stdout] 80 | |         #[inline(always)]
[INFO] [stdout] 81 | |         cfg(feature="specialization")
[INFO] [stdout] 82 | |         unsafe fn rev_get_field_raw_mut_inner(
[INFO] [stdout] ...  |
[INFO] [stdout] 92 | |     }
[INFO] [stdout]    | |_____- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]    = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]    = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]    = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/rev_get_field/components.rs:197:5
[INFO] [stdout]     |
[INFO] [stdout] 197 | /     default_if! {
[INFO] [stdout] 198 | |         #[inline(always)]
[INFO] [stdout] 199 | |         cfg(feature="specialization")
[INFO] [stdout] 200 | |         unsafe fn rev_get_field_raw_mut_inner(
[INFO] [stdout] ...   |
[INFO] [stdout] 210 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.53s
[INFO] running `Command { std: "docker" "inspect" "7c8419bd14892376ab1e8433ca7428f2feec4ffadc5c89f9c7dc78245e8388b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c8419bd14892376ab1e8433ca7428f2feec4ffadc5c89f9c7dc78245e8388b8", kill_on_drop: false }`
[INFO] [stdout] 7c8419bd14892376ab1e8433ca7428f2feec4ffadc5c89f9c7dc78245e8388b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99686ed430573514163add573d32732b595e77a3fb83b0f2127ddda694e81e73
[INFO] running `Command { std: "docker" "start" "-a" "99686ed430573514163add573d32732b595e77a3fb83b0f2127ddda694e81e73", kill_on_drop: false }`
[INFO] [stderr] warning: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition
[INFO] [stderr] (in the `core_extensions` dependency)
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:778:41
[INFO] [stdout]     |
[INFO] [stdout] 778 | #[cfg(any(feature = "for_examples", all(rust_1_41, doc)))]
[INFO] [stdout]     |                                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: expected names are: `docsrs`, `feature`, and `test` and 32 more
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:784:50
[INFO] [stdout]     |
[INFO] [stdout] 784 | #[cfg(all(not(feature = "for_examples"), not(all(rust_1_41, doc))))]
[INFO] [stdout]     |                                                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fp`
[INFO] [stdout]  --> src/field/most_impls.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::{fp, FieldType, GetField, IntoField, Structural};
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:135:11
[INFO] [stdout]     |
[INFO] [stdout] 135 |     #[cfg(feature = "rust_1_42")]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:139:15
[INFO] [stdout]     |
[INFO] [stdout] 139 |     #[cfg(not(feature = "rust_1_42"))]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/utils.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn drop(&mut self) {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 40 |     }
[INFO] [stdout]    |     - recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `InfinitePanic` is never constructed
[INFO] [stdout]   --> src/utils.rs:34:19
[INFO] [stdout]    |
[INFO] [stdout] 34 | pub(crate) struct InfinitePanic;
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/enums/variant_proxy.rs:562:5
[INFO] [stdout]     |
[INFO] [stdout] 562 | /     default_if! {
[INFO] [stdout] 563 | |         #[inline(always)]
[INFO] [stdout] 564 | |         cfg(feature="specialization")
[INFO] [stdout] 565 | |         unsafe fn get_field_raw_mut_inner(
[INFO] [stdout] ...   |
[INFO] [stdout] 581 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 | /     unsafe_delegate_structural_with! {
[INFO] [stdout] 242 | |         impl[T,] Box<T>
[INFO] [stdout] 243 | |         where[T:?Sized,]
[INFO] [stdout] ...   |
[INFO] [stdout] 263 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:241:5
[INFO] [stdout]     |
[INFO] [stdout] 241 | /     unsafe_delegate_structural_with! {
[INFO] [stdout] 242 | |         impl[T,] Box<T>
[INFO] [stdout] 243 | |         where[T:?Sized,]
[INFO] [stdout] ...   |
[INFO] [stdout] 263 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:345:1
[INFO] [stdout]     |
[INFO] [stdout] 345 | / unsafe_delegate_structural_with! {
[INFO] [stdout] 346 | |     impl['a,T:'a,] &'a mut T
[INFO] [stdout] 347 | |     where [T:?Sized,]
[INFO] [stdout] 348 | |     self_ident=this;
[INFO] [stdout] ...   |
[INFO] [stdout] 360 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/most_impls.rs:345:1
[INFO] [stdout]     |
[INFO] [stdout] 345 | / unsafe_delegate_structural_with! {
[INFO] [stdout] 346 | |     impl['a,T:'a,] &'a mut T
[INFO] [stdout] 347 | |     where [T:?Sized,]
[INFO] [stdout] 348 | |     self_ident=this;
[INFO] [stdout] ...   |
[INFO] [stdout] 360 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `$crate::default_if` which comes from the expansion of the macro `unsafe_delegate_structural_with` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]   --> src/macros.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |           default $($default_impl)*
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/field/rev_get_field/components.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 | /     default_if! {
[INFO] [stdout] 80 | |         #[inline(always)]
[INFO] [stdout] 81 | |         cfg(feature="specialization")
[INFO] [stdout] 82 | |         unsafe fn rev_get_field_raw_mut_inner(
[INFO] [stdout] ...  |
[INFO] [stdout] 92 | |     }
[INFO] [stdout]    | |_____- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]    = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]    = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]    = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling structural v0.4.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: specialization is experimental
[INFO] [stdout]    --> src/macros.rs:53:9
[INFO] [stdout]     |
[INFO] [stdout]  53 |           default $($default_impl)*
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/field/rev_get_field/components.rs:197:5
[INFO] [stdout]     |
[INFO] [stdout] 197 | /     default_if! {
[INFO] [stdout] 198 | |         #[inline(always)]
[INFO] [stdout] 199 | |         cfg(feature="specialization")
[INFO] [stdout] 200 | |         unsafe fn rev_get_field_raw_mut_inner(
[INFO] [stdout] ...   |
[INFO] [stdout] 210 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]     = help: add `#![feature(specialization)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = warning: unstable syntax can change at any point in the future, causing a hard error!
[INFO] [stdout]     = note: for more information, see issue #154045 <https://github.com/rust-lang/rust/issues/154045>
[INFO] [stdout]     = note: this warning originates in the macro `default_if` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: tests must be run with the "testing" feature
[INFO] [stdout]    --> src/lib.rs:788:1
[INFO] [stdout]     |
[INFO] [stdout] 788 | compile_error! { "tests must be run with the \"testing\" feature" }
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:778:41
[INFO] [stdout]     |
[INFO] [stdout] 778 | #[cfg(any(feature = "for_examples", all(rust_1_41, doc)))]
[INFO] [stdout]     |                                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: expected names are: `docsrs`, `feature`, and `test` and 32 more
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]     = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition name: `rust_1_41`
[INFO] [stdout]    --> src/lib.rs:784:50
[INFO] [stdout]     |
[INFO] [stdout] 784 | #[cfg(all(not(feature = "for_examples"), not(all(rust_1_41, doc))))]
[INFO] [stdout]     |                                                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider using a Cargo feature instead
[INFO] [stdout]     = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
[INFO] [stdout]              [lints.rust]
[INFO] [stdout]              unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rust_1_41)'] }
[INFO] [stdout]     = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(rust_1_41)");` to the top of the `build.rs`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fp`
[INFO] [stdout]  --> src/field/most_impls.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::{fp, FieldType, GetField, IntoField, Structural};
[INFO] [stdout]   |             ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fp`
[INFO] [stdout]    --> src/field/tuple_impls.rs:340:17
[INFO] [stdout]     |
[INFO] [stdout] 340 |     use crate::{fp, GetField, Structural, StructuralExt};
[INFO] [stdout]     |                 ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TS`
[INFO] [stdout]    --> src/structural_aliases/array_traits.rs:369:44
[INFO] [stdout]     |
[INFO] [stdout] 369 |     use crate::{Structural, StructuralExt, TS};
[INFO] [stdout]     |                                            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:135:11
[INFO] [stdout]     |
[INFO] [stdout] 135 |     #[cfg(feature = "rust_1_42")]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `rust_1_42`
[INFO] [stdout]    --> src/utils.rs:139:15
[INFO] [stdout]     |
[INFO] [stdout] 139 |     #[cfg(not(feature = "rust_1_42"))]
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected values for `feature` are: `all`, `alloc`, `default`, `disable_const_str`, `for_examples`, `hide_reexports`, `impl_fields`, `nightly_impl_fields`, `nightly_specialization`, `nightly_use_const_str`, `specialization`, `std`, `test_all`, `testing`, and `use_const_str`
[INFO] [stdout]     = help: consider adding `rust_1_42` as a feature in `Cargo.toml`
[INFO] [stdout]     = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]   --> src/utils.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn drop(&mut self) {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] ...
[INFO] [stdout] 40 |     }
[INFO] [stdout]    |     - recursive call site
[INFO] [stdout]    |
[INFO] [stdout]    = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]    = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `structural` (lib test) due to 1 previous error; 8 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "99686ed430573514163add573d32732b595e77a3fb83b0f2127ddda694e81e73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99686ed430573514163add573d32732b595e77a3fb83b0f2127ddda694e81e73", kill_on_drop: false }`
[INFO] [stdout] 99686ed430573514163add573d32732b595e77a3fb83b0f2127ddda694e81e73
