[INFO] fetching crate mycelium-bitfield 0.1.5...
[INFO] building mycelium-bitfield-0.1.5 against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237-1
[INFO] extracting crate mycelium-bitfield 0.1.5 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate mycelium-bitfield 0.1.5
[INFO] finished tweaking crates.io crate mycelium-bitfield 0.1.5
[INFO] tweaked toml for crates.io crate mycelium-bitfield 0.1.5 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mycelium-bitfield 0.1.5 on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "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" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "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]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 39 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 52372beee386bb6425de2bcbc03919f07b4d4b2b4e20f2aacbbf87cb1cd46304
[INFO] running `Command { std: "docker" "start" "-a" "52372beee386bb6425de2bcbc03919f07b4d4b2b4e20f2aacbbf87cb1cd46304", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52372beee386bb6425de2bcbc03919f07b4d4b2b4e20f2aacbbf87cb1cd46304", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52372beee386bb6425de2bcbc03919f07b4d4b2b4e20f2aacbbf87cb1cd46304", kill_on_drop: false }`
[INFO] [stdout] 52372beee386bb6425de2bcbc03919f07b4d4b2b4e20f2aacbbf87cb1cd46304
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e5c6673bb68139c825ae4e2719f380f68a8267d533d7f9f711f12603d31267e
[INFO] running `Command { std: "docker" "start" "-a" "1e5c6673bb68139c825ae4e2719f380f68a8267d533d7f9f711f12603d31267e", kill_on_drop: false }`
[INFO] [stderr]    Compiling mycelium-bitfield v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `trace_macros`
[INFO] [stdout]  --> src/lib.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![cfg_attr(trace_macros, feature(trace_macros))]
[INFO] [stdout]   |             ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: `trace_macros`
[INFO] [stdout]   --> src/lib.rs:33:25
[INFO] [stdout]    |
[INFO] [stdout] 33 | #[cfg(any(test, docsrs, trace_macros))]
[INFO] [stdout]    |                         ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: unexpected `cfg` condition name: `loom`
[INFO] [stdout]     --> src/pack.rs:1081:21
[INFO] [stdout]      |
[INFO] [stdout] 1081 | #[cfg(all(test, not(loom)))]
[INFO] [stdout]      |                     ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: expected names are: `docsrs`, `feature`, and `test` and 31 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(loom)'] }
[INFO] [stdout]      = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(loom)");` 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `Command { std: "docker" "inspect" "1e5c6673bb68139c825ae4e2719f380f68a8267d533d7f9f711f12603d31267e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e5c6673bb68139c825ae4e2719f380f68a8267d533d7f9f711f12603d31267e", kill_on_drop: false }`
[INFO] [stdout] 1e5c6673bb68139c825ae4e2719f380f68a8267d533d7f9f711f12603d31267e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10320fdc4c43c1dcd313752602da14e546dd09375f82f14dc85ee44b367991dc
[INFO] running `Command { std: "docker" "start" "-a" "10320fdc4c43c1dcd313752602da14e546dd09375f82f14dc85ee44b367991dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stdout] warning: unexpected `cfg` condition name: `trace_macros`
[INFO] [stdout]  --> src/lib.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![cfg_attr(trace_macros, feature(trace_macros))]
[INFO] [stdout]   |             ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: `trace_macros`
[INFO] [stdout]   --> src/lib.rs:33:25
[INFO] [stdout]    |
[INFO] [stdout] 33 | #[cfg(any(test, docsrs, trace_macros))]
[INFO] [stdout]    |                         ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: unexpected `cfg` condition name: `loom`
[INFO] [stdout]     --> src/pack.rs:1081:21
[INFO] [stdout]      |
[INFO] [stdout] 1081 | #[cfg(all(test, not(loom)))]
[INFO] [stdout]      |                     ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: expected names are: `docsrs`, `feature`, and `test` and 31 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(loom)'] }
[INFO] [stdout]      = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(loom)");` 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] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling wait-timeout v0.2.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling tempfile v3.23.0
[INFO] [stderr]    Compiling rand_xorshift v0.4.0
[INFO] [stderr]    Compiling rand v0.9.2
[INFO] [stderr]    Compiling rusty-fork v0.3.0
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling proptest v1.8.0
[INFO] [stderr]    Compiling mycelium-bitfield v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `trace_macros`
[INFO] [stdout]  --> src/lib.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![cfg_attr(trace_macros, feature(trace_macros))]
[INFO] [stdout]   |             ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: `trace_macros`
[INFO] [stdout]   --> src/lib.rs:33:25
[INFO] [stdout]    |
[INFO] [stdout] 33 | #[cfg(any(test, docsrs, trace_macros))]
[INFO] [stdout]    |                         ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]    = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: unexpected `cfg` condition name: `loom`
[INFO] [stdout]     --> src/pack.rs:1081:21
[INFO] [stdout]      |
[INFO] [stdout] 1081 | #[cfg(all(test, not(loom)))]
[INFO] [stdout]      |                     ^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = help: expected names are: `docsrs`, `feature`, and `test` and 31 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(loom)'] }
[INFO] [stdout]      = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(loom)");` 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: unexpected `cfg` condition name: `trace_macros`
[INFO] [stdout]  --> src/example.rs:2:7
[INFO] [stdout]   |
[INFO] [stdout] 2 | #[cfg(trace_macros)]
[INFO] [stdout]   |       ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: unexpected `cfg` condition name: `trace_macros`
[INFO] [stdout]  --> src/example.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | #[cfg(trace_macros)]
[INFO] [stdout]   |       ^^^^^^^^^^^^ help: there is a config with a similar name: `proc_macro`
[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(trace_macros)'] }
[INFO] [stdout]   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(trace_macros)");` 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: `#[automatically_derived]` attribute cannot be used on inherent impl blocks
[INFO] [stdout]    --> src/bitfield.rs:399:9
[INFO] [stdout]     |
[INFO] [stdout] 399 |           #[automatically_derived]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 848 | /     bitfield! {
[INFO] [stdout] 849 | |         #[allow(dead_code)]
[INFO] [stdout] 850 | |         struct TestBitfield<u32> {
[INFO] [stdout] 851 | |             const HELLO = 4;
[INFO] [stdout] ...   |
[INFO] [stdout] 859 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[automatically_derived]` can only be applied to trait impl blocks
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]     = note: this warning originates in the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[automatically_derived]` attribute cannot be used on inherent impl blocks
[INFO] [stdout]    --> src/bitfield.rs:399:9
[INFO] [stdout]     |
[INFO] [stdout] 399 |           #[automatically_derived]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 861 | /     bitfield! {
[INFO] [stdout] 862 | |         /// This is only here to ensure it compiles...
[INFO] [stdout] 863 | |         #[allow(dead_code)]
[INFO] [stdout] 864 | |         struct TestBitfieldHuge<u128> {
[INFO] [stdout] ...   |
[INFO] [stdout] 874 | |     }
[INFO] [stdout]     | |_____- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[automatically_derived]` can only be applied to trait impl blocks
[INFO] [stdout]     = note: this warning originates in the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[automatically_derived]` attribute cannot be used on inherent impl blocks
[INFO] [stdout]    --> src/bitfield.rs:399:9
[INFO] [stdout]     |
[INFO] [stdout] 399 |           #[automatically_derived]
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/example/example_bitfield.rs:6:1
[INFO] [stdout]     |
[INFO] [stdout]   6 | / bitfield! {
[INFO] [stdout]   7 | |     /// An example bitfield type.
[INFO] [stdout]   8 | |     ///
[INFO] [stdout]   9 | |     /// This type was generated by the following [`bitfield!`]
[INFO] [stdout] ...   |
[INFO] [stdout]  51 | | }
[INFO] [stdout]     | |_- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[automatically_derived]` can only be applied to trait impl blocks
[INFO] [stdout]     = note: this warning originates in the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 10.17s
[INFO] running `Command { std: "docker" "inspect" "10320fdc4c43c1dcd313752602da14e546dd09375f82f14dc85ee44b367991dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10320fdc4c43c1dcd313752602da14e546dd09375f82f14dc85ee44b367991dc", kill_on_drop: false }`
[INFO] [stdout] 10320fdc4c43c1dcd313752602da14e546dd09375f82f14dc85ee44b367991dc
