[INFO] cloning repository https://github.com/MrElectrify/virtual-fs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MrElectrify/virtual-fs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrElectrify%2Fvirtual-fs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrElectrify%2Fvirtual-fs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 51ff1f47a7532950c7473e151ac70a64a59076f4
[INFO] checking MrElectrify/virtual-fs against nightly-2024-02-05 for check-cfg
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrElectrify%2Fvirtual-fs" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrElectrify/virtual-fs 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 git repo https://github.com/MrElectrify/virtual-fs
[INFO] finished tweaking git repo https://github.com/MrElectrify/virtual-fs
[INFO] tweaked toml for git repo https://github.com/MrElectrify/virtual-fs written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/MrElectrify/virtual-fs already has a lockfile, it will not be regenerated
[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 }`
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[INFO] [stderr]   Downloaded xattr v1.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] eb44a7770d088962f282f1f42ac1cd7706e4aefe5f18399981f8d1792e606ad1
[INFO] running `Command { std: "docker" "start" "-a" "eb44a7770d088962f282f1f42ac1cd7706e4aefe5f18399981f8d1792e606ad1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb44a7770d088962f282f1f42ac1cd7706e4aefe5f18399981f8d1792e606ad1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb44a7770d088962f282f1f42ac1cd7706e4aefe5f18399981f8d1792e606ad1", kill_on_drop: false }`
[INFO] [stdout] eb44a7770d088962f282f1f42ac1cd7706e4aefe5f18399981f8d1792e606ad1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] b1b9565acf2c50019f9cda206daa365ce8f2ea8b06506a434b55191ad3d7b1bb
[INFO] running `Command { std: "docker" "start" "-a" "b1b9565acf2c50019f9cda206daa365ce8f2ea8b06506a434b55191ad3d7b1bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.152
[INFO] [stderr]    Compiling pkg-config v0.3.28
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling zstd-safe v5.0.2+zstd.1.5.2
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking predicates-core v1.0.6
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[INFO] [stderr]    Compiling parking_lot_core v0.9.9
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[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling jobserver v0.1.27
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking smallvec v1.13.1
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking termtree v0.4.1
[INFO] [stderr]     Checking time-core v0.1.2
[INFO] [stderr]     Checking predicates-tree v1.0.9
[INFO] [stderr]     Checking time v0.3.31
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking xattr v1.1.1
[INFO] [stderr]     Checking predicates v3.1.0
[INFO] [stderr]     Checking constant_time_eq v0.1.5
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking downcast v0.11.0
[INFO] [stderr]     Checking crypto-common v0.1.6
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[INFO] [stderr]     Checking either v1.9.0
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[INFO] [stderr]    Compiling duplicate v1.0.0
[INFO] [stderr]     Checking cipher v0.4.4
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking itertools v0.12.0
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking aes v0.8.3
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[INFO] [stderr]     Checking sha1 v0.10.6
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[INFO] [stderr]     Checking path-slash v0.2.1
[INFO] [stderr]     Checking pbkdf2 v0.11.0
[INFO] [stderr]    Compiling zstd-sys v2.0.9+zstd.1.5.5
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]    Compiling lzma-sys v0.1.20
[INFO] [stderr]     Checking xz2 v0.1.7
[INFO] [stderr]     Checking xz v0.1.0
[INFO] [stderr]     Checking bzip2 v0.4.4
[INFO] [stderr]    Compiling enumflags2_derive v0.7.8
[INFO] [stderr]    Compiling mockall_derive v0.12.1
[INFO] [stderr]     Checking enumflags2 v0.7.8
[INFO] [stderr]     Checking zstd v0.11.2+zstd.1.5.2
[INFO] [stderr]     Checking zip v0.6.6
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[INFO] [stderr]     Checking virtual-filesystem v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.93s
[INFO] running `Command { std: "docker" "inspect" "b1b9565acf2c50019f9cda206daa365ce8f2ea8b06506a434b55191ad3d7b1bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1b9565acf2c50019f9cda206daa365ce8f2ea8b06506a434b55191ad3d7b1bb", kill_on_drop: false }`
[INFO] [stdout] b1b9565acf2c50019f9cda206daa365ce8f2ea8b06506a434b55191ad3d7b1bb
[INFO] checking MrElectrify/virtual-fs against nightly-2024-02-05+rustflags=-Dunexpected_cfgs+cargoflags=-Zcheck-cfg for check-cfg
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMrElectrify%2Fvirtual-fs" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MrElectrify/virtual-fs 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 git repo https://github.com/MrElectrify/virtual-fs
[INFO] finished tweaking git repo https://github.com/MrElectrify/virtual-fs
[INFO] tweaked toml for git repo https://github.com/MrElectrify/virtual-fs written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/MrElectrify/virtual-fs already has a lockfile, it will not be regenerated
[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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 55d3091ea984d8cacf18411e8e36b4435f16724e632be670170fd7d353a3a519
[INFO] running `Command { std: "docker" "start" "-a" "55d3091ea984d8cacf18411e8e36b4435f16724e632be670170fd7d353a3a519", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55d3091ea984d8cacf18411e8e36b4435f16724e632be670170fd7d353a3a519", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55d3091ea984d8cacf18411e8e36b4435f16724e632be670170fd7d353a3a519", kill_on_drop: false }`
[INFO] [stdout] 55d3091ea984d8cacf18411e8e36b4435f16724e632be670170fd7d353a3a519
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 7535eb5cc2d506e18f8e0f4831cc3171578ff924bacd46e19da908d1c9222e6a
[INFO] running `Command { std: "docker" "start" "-a" "7535eb5cc2d506e18f8e0f4831cc3171578ff924bacd46e19da908d1c9222e6a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.152
[INFO] [stderr]    Compiling pkg-config v0.3.28
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]     Checking subtle v2.5.0
[INFO] [stderr]     Checking cpufeatures v0.2.12
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling zstd-safe v5.0.2+zstd.1.5.2
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking powerfmt v0.2.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.9
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking base64ct v1.6.0
[INFO] [stderr]     Checking predicates-core v1.0.6
[INFO] [stderr]     Checking miniz_oxide v0.7.1
[INFO] [stderr]     Checking deranged v0.3.11
[INFO] [stderr]     Checking password-hash v0.4.2
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling jobserver v0.1.27
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking termtree v0.4.1
[INFO] [stderr]     Checking time-core v0.1.2
[INFO] [stderr]     Checking smallvec v1.13.1
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking anstyle v1.0.4
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking time v0.3.31
[INFO] [stderr]     Checking predicates v3.1.0
[INFO] [stderr]     Checking predicates-tree v1.0.9
[INFO] [stderr]     Checking flate2 v1.0.28
[INFO] [stderr]     Checking xattr v1.1.1
[INFO] [stderr]     Checking filetime v0.2.23
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking inout v0.1.3
[INFO] [stderr]     Checking downcast v0.11.0
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking cipher v0.4.4
[INFO] [stderr]     Checking constant_time_eq v0.1.5
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking fragile v2.0.0
[INFO] [stderr]     Checking itertools v0.12.0
[INFO] [stderr]     Checking sha2 v0.10.8
[INFO] [stderr]     Checking hmac v0.12.1
[INFO] [stderr]     Checking aes v0.8.3
[INFO] [stderr]     Checking sha1 v0.10.6
[INFO] [stderr]    Compiling duplicate v1.0.0
[INFO] [stderr]     Checking tar v0.4.40
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking pbkdf2 v0.11.0
[INFO] [stderr]     Checking path-slash v0.2.1
[INFO] [stderr]     Checking normalize-path v0.2.1
[INFO] [stderr]    Compiling zstd-sys v2.0.9+zstd.1.5.5
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]    Compiling lzma-sys v0.1.20
[INFO] [stderr]     Checking xz2 v0.1.7
[INFO] [stderr]     Checking xz v0.1.0
[INFO] [stderr]     Checking bzip2 v0.4.4
[INFO] [stderr]    Compiling enumflags2_derive v0.7.8
[INFO] [stderr]    Compiling mockall_derive v0.12.1
[INFO] [stderr]     Checking enumflags2 v0.7.8
[INFO] [stderr]     Checking zstd v0.11.2+zstd.1.5.2
[INFO] [stderr]     Checking zip v0.6.6
[INFO] [stderr]     Checking mockall v0.12.1
[INFO] [stderr]     Checking virtual-filesystem v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: unexpected `cfg` condition name: `fallback_search`
[INFO] [stdout]   --> src/zip_fs.rs:61:15
[INFO] [stdout]    |
[INFO] [stdout] 61 |     #[cfg(not(fallback_search))]
[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(fallback_search)");` 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: `fallback_search`
[INFO] [stdout]   --> src/zip_fs.rs:75:11
[INFO] [stdout]    |
[INFO] [stdout] 75 |     #[cfg(fallback_search)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(fallback_search)");` 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] 
[INFO] [stdout] 
[INFO] [stdout] error: unexpected `cfg` condition name: `fallback_search`
[INFO] [stdout]   --> src/zip_fs.rs:61:15
[INFO] [stdout]    |
[INFO] [stdout] 61 |     #[cfg(not(fallback_search))]
[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(fallback_search)");` 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: `fallback_search`
[INFO] [stdout]   --> src/zip_fs.rs:75:11
[INFO] [stdout]    |
[INFO] [stdout] 75 |     #[cfg(fallback_search)]
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(fallback_search)");` 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] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `virtual-filesystem` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `virtual-filesystem` (lib test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "7535eb5cc2d506e18f8e0f4831cc3171578ff924bacd46e19da908d1c9222e6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7535eb5cc2d506e18f8e0f4831cc3171578ff924bacd46e19da908d1c9222e6a", kill_on_drop: false }`
[INFO] [stdout] 7535eb5cc2d506e18f8e0f4831cc3171578ff924bacd46e19da908d1c9222e6a
