[INFO] fetching crate miraland-cost-model 1.18.1...
[INFO] checking miraland-cost-model-1.18.1 against nightly-2024-02-05 for check-cfg
[INFO] extracting crate miraland-cost-model 1.18.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate miraland-cost-model 1.18.1 on toolchain nightly-2024-02-05
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate miraland-cost-model 1.18.1
[INFO] finished tweaking crates.io crate miraland-cost-model 1.18.1
[INFO] tweaked toml for crates.io crate miraland-cost-model 1.18.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded miraland-loader-v4-program v1.18.1
[INFO] [stderr]   Downloaded miraland-address-lookup-table-program v1.18.1
[INFO] [stderr]   Downloaded enum-iterator v1.5.0
[INFO] [stderr]   Downloaded enum-iterator-derive v1.3.0
[INFO] [stderr]   Downloaded scroll_derive v0.11.1
[INFO] [stderr]   Downloaded miraland-stake-program v1.18.1
[INFO] [stderr]   Downloaded miraland-system-program v1.18.1
[INFO] [stderr]   Downloaded miraland-metrics v1.18.1
[INFO] [stderr]   Downloaded miraland-program-runtime v1.18.1
[INFO] [stderr]   Downloaded solana_rbpf v0.8.0
[INFO] [stderr]   Downloaded miraland-bpf-loader-program v1.18.1
[INFO] [stderr]   Downloaded miraland-vote-program v1.18.1
[INFO] [stderr]   Downloaded miraland-zk-token-sdk v1.18.1
[INFO] [stderr]   Downloaded miraland-compute-budget-program v1.18.1
[INFO] [stderr]   Downloaded miraland-config-program v1.18.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-02-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afa288c5068ef9cffb2719af1fbd2c56b706ce5506a6d548fd6420b18296f3f4
[INFO] running `Command { std: "docker" "start" "-a" "afa288c5068ef9cffb2719af1fbd2c56b706ce5506a6d548fd6420b18296f3f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afa288c5068ef9cffb2719af1fbd2c56b706ce5506a6d548fd6420b18296f3f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afa288c5068ef9cffb2719af1fbd2c56b706ce5506a6d548fd6420b18296f3f4", kill_on_drop: false }`
[INFO] [stdout] afa288c5068ef9cffb2719af1fbd2c56b706ce5506a6d548fd6420b18296f3f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-02-05" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4765e24585187ddb7ce8965b19c5d329010e7c4f291b0ea36ebd26d9481550ac
[INFO] running `Command { std: "docker" "start" "-a" "4765e24585187ddb7ce8965b19c5d329010e7c4f291b0ea36ebd26d9481550ac", kill_on_drop: false }`
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[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 02s
[INFO] running `Command { std: "docker" "inspect" "4765e24585187ddb7ce8965b19c5d329010e7c4f291b0ea36ebd26d9481550ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4765e24585187ddb7ce8965b19c5d329010e7c4f291b0ea36ebd26d9481550ac", kill_on_drop: false }`
[INFO] [stdout] 4765e24585187ddb7ce8965b19c5d329010e7c4f291b0ea36ebd26d9481550ac
[INFO] checking miraland-cost-model-1.18.1 against nightly-2024-02-05+rustflags=-Dunexpected_cfgs+cargoflags=-Zcheck-cfg for check-cfg
[INFO] extracting crate miraland-cost-model 1.18.1 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate miraland-cost-model 1.18.1 on toolchain nightly-2024-02-05
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate miraland-cost-model 1.18.1
[INFO] finished tweaking crates.io crate miraland-cost-model 1.18.1
[INFO] tweaked toml for crates.io crate miraland-cost-model 1.18.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-02-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-02-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5edd0d857aca29db09aef612dd3b95aa80cfd5d2168a0c06effb556f02b3b5b2
[INFO] running `Command { std: "docker" "start" "-a" "5edd0d857aca29db09aef612dd3b95aa80cfd5d2168a0c06effb556f02b3b5b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5edd0d857aca29db09aef612dd3b95aa80cfd5d2168a0c06effb556f02b3b5b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5edd0d857aca29db09aef612dd3b95aa80cfd5d2168a0c06effb556f02b3b5b2", kill_on_drop: false }`
[INFO] [stdout] 5edd0d857aca29db09aef612dd3b95aa80cfd5d2168a0c06effb556f02b3b5b2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dunexpected_cfgs" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-02-05" "check" "--frozen" "--all" "--all-targets" "--message-format=json" "-Zcheck-cfg", kill_on_drop: false }`
[INFO] [stdout] f064d7834be396cf9866b9e271e5711e710755fe2e73e3b5e90c8d7405fc8ba6
[INFO] running `Command { std: "docker" "start" "-a" "f064d7834be396cf9866b9e271e5711e710755fe2e73e3b5e90c8d7405fc8ba6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling serde v1.0.196
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[INFO] [stderr]    Compiling num-traits v0.2.17
[INFO] [stderr]    Compiling getrandom v0.1.16
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[INFO] [stderr]    Compiling num-integer v0.1.45
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[INFO] [stderr]    Compiling quote v1.0.35
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[INFO] [stderr]    Compiling feature-probe v0.1.1
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[INFO] [stderr]    Compiling bv v0.11.1
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[INFO] [stderr]    Compiling miraland-frozen-abi-macro v1.18.1
[INFO] [stderr]     Checking unicode-normalization v0.1.22
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking getrandom v0.2.12
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[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling libsecp256k1-core v0.2.2
[INFO] [stderr]     Checking socket2 v0.5.5
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[INFO] [stderr]    Compiling indexmap v2.2.2
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling im v15.1.0
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]     Checking rand_chacha v0.3.1
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[INFO] [stderr]    Compiling serde_json v1.0.113
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[INFO] [stderr]    Compiling winnow v0.5.37
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[INFO] [stderr]    Compiling blake3 v1.5.0
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[INFO] [stderr]    Compiling libsecp256k1 v0.6.0
[INFO] [stderr]    Compiling miraland-frozen-abi v1.18.1
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]    Compiling memoffset v0.9.0
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[INFO] [stderr]     Checking base64 v0.21.7
[INFO] [stderr]    Compiling wasm-bindgen v0.2.90
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[INFO] [stderr]    Compiling miraland-program v1.18.1
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[INFO] [stderr]    Compiling httparse v1.8.0
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[INFO] [stderr]    Compiling bs58 v0.4.0
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[INFO] [stderr]    Compiling toml_edit v0.21.1
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[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking alloc-stdlib v0.2.2
[INFO] [stderr]    Compiling borsh-schema-derive-internal v0.9.3
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[INFO] [stderr]    Compiling borsh-derive-internal v0.10.3
[INFO] [stderr]    Compiling borsh-derive-internal v0.9.3
[INFO] [stderr]    Compiling miraland-sdk v1.18.1
[INFO] [stderr]    Compiling num-bigint v0.2.6
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[INFO] [stderr]     Checking http-body v0.4.6
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling darling_core v0.20.5
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.90
[INFO] [stderr]     Checking uriparse v0.6.4
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking qstring v0.7.2
[INFO] [stderr]     Checking form_urlencoded v1.2.1
[INFO] [stderr]     Checking regex v1.10.3
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]     Checking assert_matches v1.5.0
[INFO] [stderr]     Checking tower-service v0.3.2
[INFO] [stderr]     Checking unicode-bidi v0.3.15
[INFO] [stderr]     Checking httpdate v1.0.3
[INFO] [stderr]     Checking env_logger v0.9.3
[INFO] [stderr]    Compiling proc-macro-crate v3.1.0
[INFO] [stderr]     Checking brotli v3.4.0
[INFO] [stderr]     Checking tokio-util v0.7.10
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking miraland-logger v1.18.1
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking rustls-pemfile v1.0.4
[INFO] [stderr]     Checking encoding_rs v0.8.33
[INFO] [stderr]     Checking idna v0.5.0
[INFO] [stderr]     Checking plain v0.2.3
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.90
[INFO] [stderr]     Checking ascii v0.9.3
[INFO] [stderr]     Checking webpki-roots v0.25.4
[INFO] [stderr]     Checking ipnet v2.9.0
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[INFO] [stderr]     Checking sync_wrapper v0.1.2
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]     Checking gethostname v0.2.3
[INFO] [stderr]    Compiling miraland-program-runtime v1.18.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.11
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]     Checking h2 v0.3.24
[INFO] [stderr]     Checking rustc-demangle v0.1.23
[INFO] [stderr]     Checking url v2.5.0
[INFO] [stderr]     Checking eager v0.1.0
[INFO] [stderr]    Compiling miraland-vote-program v1.18.1
[INFO] [stderr]    Compiling miraland-address-lookup-table-program v1.18.1
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking percentage v0.1.0
[INFO] [stderr]    Compiling miraland-stake-program v1.18.1
[INFO] [stderr]    Compiling test-case-core v3.3.1
[INFO] [stderr]    Compiling miraland-cost-model v1.18.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]    Compiling ark-serialize-derive v0.4.2
[INFO] [stderr]    Compiling ark-ff-macros v0.4.2
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling ark-ff-asm v0.4.2
[INFO] [stderr]    Compiling borsh-derive v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling zeroize_derive v1.4.2
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]    Compiling bytemuck_derive v1.5.0
[INFO] [stderr]    Compiling darling_macro v0.20.5
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.90
[INFO] [stderr]    Compiling borsh-derive v0.10.3
[INFO] [stderr]    Compiling num_enum_derive v0.7.2
[INFO] [stderr]    Compiling miraland-sdk-macro v1.18.1
[INFO] [stderr]     Checking borsh v0.9.3
[INFO] [stderr]     Checking zeroize v1.3.0
[INFO] [stderr]    Compiling num-derive v0.4.1
[INFO] [stderr]    Compiling darling v0.20.5
[INFO] [stderr]    Compiling serde_with_macros v2.3.3
[INFO] [stderr]    Compiling qualifier_attr v0.2.2
[INFO] [stderr]    Compiling scroll_derive v0.11.1
[INFO] [stderr]    Compiling enum-iterator-derive v1.3.0
[INFO] [stderr]     Checking borsh v0.10.3
[INFO] [stderr]     Checking hyper v0.14.28
[INFO] [stderr]     Checking async-compression v0.4.6
[INFO] [stderr]     Checking merlin v3.0.0
[INFO] [stderr]    Compiling test-case-macros v3.3.1
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[INFO] [stderr]     Checking test-case v3.3.1
[INFO] [stderr]     Checking num_enum v0.7.2
[INFO] [stderr]     Checking enum-iterator v1.5.0
[INFO] [stderr]     Checking goblin v0.5.4
[INFO] [stderr]     Checking sct v0.7.1
[INFO] [stderr]     Checking rustls-webpki v0.101.7
[INFO] [stderr]     Checking solana_rbpf v0.8.0
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[INFO] [stderr]     Checking bincode v1.3.3
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[INFO] [stderr]     Checking ark-ec v0.4.2
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[INFO] [stderr]     Checking light-poseidon v0.2.0
[INFO] [stderr]     Checking miraland-measure v1.18.1
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[INFO] [stderr]     Checking miraland-zk-token-sdk v1.18.1
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[INFO] [stderr]     Checking miraland-compute-budget-program v1.18.1
[INFO] [stderr]     Checking miraland-loader-v4-program v1.18.1
[INFO] [stderr]     Checking miraland-bpf-loader-program v1.18.1
[INFO] [stdout] error: unexpected `cfg` condition name: `RUSTC_WITH_SPECIALIZATION`
[INFO] [stdout]  --> src/lib.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
[INFO] [stdout]   = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(RUSTC_WITH_SPECIALIZATION)");` to the top of a `build.rs`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
[INFO] [stdout]   = note: requested on the command line with `-D unexpected-cfgs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unexpected `cfg` condition name: `RUSTC_WITH_SPECIALIZATION`
[INFO] [stdout]  --> src/lib.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
[INFO] [stdout]   = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(RUSTC_WITH_SPECIALIZATION)");` to the top of a `build.rs`
[INFO] [stdout]   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
[INFO] [stdout]   = note: requested on the command line with `-D unexpected-cfgs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `miraland-cost-model` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `miraland-cost-model` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "f064d7834be396cf9866b9e271e5711e710755fe2e73e3b5e90c8d7405fc8ba6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f064d7834be396cf9866b9e271e5711e710755fe2e73e3b5e90c8d7405fc8ba6", kill_on_drop: false }`
[INFO] [stdout] f064d7834be396cf9866b9e271e5711e710755fe2e73e3b5e90c8d7405fc8ba6
