[INFO] fetching crate smtp_srv 0.2.28...
[INFO] checking smtp_srv-0.2.28 against 1.95.0 for pr-155915
[INFO] extracting crate smtp_srv 0.2.28 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate smtp_srv 0.2.28
[INFO] finished tweaking crates.io crate smtp_srv 0.2.28
[INFO] tweaked toml for crates.io crate smtp_srv 0.2.28 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate smtp_srv 0.2.28 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate smtp_srv 0.2.28 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" "+1.95.0" "fetch" "--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]  Downloading crates ...
[INFO] [stderr]   Downloaded linkme-impl v0.3.35
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[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 264cfc1f1e5798ebf0edd4f51fd8615ae1ef82f2f016438536af84d4841593aa
[INFO] running `Command { std: "docker" "start" "-a" "264cfc1f1e5798ebf0edd4f51fd8615ae1ef82f2f016438536af84d4841593aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "264cfc1f1e5798ebf0edd4f51fd8615ae1ef82f2f016438536af84d4841593aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "264cfc1f1e5798ebf0edd4f51fd8615ae1ef82f2f016438536af84d4841593aa", kill_on_drop: false }`
[INFO] [stdout] 264cfc1f1e5798ebf0edd4f51fd8615ae1ef82f2f016438536af84d4841593aa
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6749d77252c8e28fa6adf7e2ee1bbb7b4d989bc43e2d667855bf55afe976cda
[INFO] running `Command { std: "docker" "start" "-a" "b6749d77252c8e28fa6adf7e2ee1bbb7b4d989bc43e2d667855bf55afe976cda", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.183
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[INFO] [stderr]    Compiling typeid v1.0.3
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[INFO] [stderr]    Compiling aws-lc-rs v1.16.1
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[INFO] [stderr]    Compiling num-conv v0.2.0
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[INFO] [stderr]     Checking float-cmp v0.10.0
[INFO] [stderr]    Compiling pin-project-internal v1.1.11
[INFO] [stderr]    Compiling fred-macros v0.1.0
[INFO] [stderr]    Compiling ref-cast-impl v1.0.25
[INFO] [stderr]     Checking arrayvec v0.7.6
[INFO] [stderr]     Checking urlencoding v2.1.3
[INFO] [stderr]     Checking simdutf8 v0.1.5
[INFO] [stderr]     Checking arraydeque v0.5.1
[INFO] [stderr]     Checking semver v1.0.27
[INFO] [stderr]     Checking bitcode v0.6.9
[INFO] [stderr]     Checking faststr v0.2.34
[INFO] [stderr]     Checking sys_notify v0.1.5
[INFO] [stderr]     Checking saphyr-parser v0.0.6
[INFO] [stderr]     Checking crypto-primes v0.7.0
[INFO] [stderr]     Checking logforth-layout-json v0.3.0
[INFO] [stderr]     Checking logforth-append-file v0.3.0
[INFO] [stderr]     Checking logforth-layout-text v0.3.0
[INFO] [stderr]     Checking ref-cast v1.0.25
[INFO] [stderr]     Checking self_cmd v0.1.10
[INFO] [stderr]     Checking rand_chacha v0.10.0
[INFO] [stderr]     Checking expire_cache v0.1.25
[INFO] [stderr]     Checking tokio-util v0.7.18
[INFO] [stderr]     Checking xboot v0.1.35
[INFO] [stderr]     Checking race v0.1.14
[INFO] [stderr]     Checking logforth v0.29.1
[INFO] [stderr]     Checking signal-hook-tokio v0.3.1
[INFO] [stderr]     Checking async_wrap v0.1.10
[INFO] [stderr]     Checking tokio-stream v0.1.18
[INFO] [stderr]     Checking static_ v0.1.21
[INFO] [stderr]     Checking der-parser v10.0.0
[INFO] [stderr]     Checking xattr v1.6.1
[INFO] [stderr]     Checking filetime v0.2.27
[INFO] [stderr]     Checking auth_trait v0.1.6
[INFO] [stderr]     Checking sonic-number v0.1.1
[INFO] [stderr]     Checking sonic-simd v0.1.3
[INFO] [stderr]     Checking const-str v0.7.1
[INFO] [stderr]     Checking unsafe-libyaml-norway v0.2.15
[INFO] [stderr]     Checking tar v0.4.44
[INFO] [stderr]     Checking idns v0.2.13
[INFO] [stderr]     Checking log_init v0.1.34
[INFO] [stderr]     Checking listen_signal v0.1.15
[INFO] [stderr]     Checking x509-parser v0.18.1
[INFO] [stderr]     Checking sonic-rs v0.5.7
[INFO] [stderr]     Checking pin-project v1.1.11
[INFO] [stderr]     Checking expire_set v0.1.9
[INFO] [stderr]     Checking dns_parse v0.1.2
[INFO] [stderr]     Checking async-scoped v0.9.0
[INFO] [stderr]     Checking socket_port v0.1.31
[INFO] [stderr]     Checking graceful_restart v0.1.6
[INFO] [stderr]     Checking drop v0.1.4
[INFO] [stderr]     Checking rustls-pemfile v2.2.0
[INFO] [stderr]     Checking email_address v0.2.9
[INFO] [stderr]     Checking mail_forward v0.1.9
[INFO] [stderr]     Checking xbin v0.1.9
[INFO] [stderr]     Checking auth_env v0.1.4
[INFO] [stderr]     Checking genv v0.1.18
[INFO] [stderr]     Checking regex v1.12.3
[INFO] [stderr]     Checking serde_yaml_bw v2.5.2
[INFO] [stderr]     Checking rsa v0.10.0-rc.17
[INFO] [stderr]     Checking mimalloc v0.1.48
[INFO] [stderr]     Checking sk_dkim v0.1.7
[INFO] [stderr]     Checking zstd v0.13.3
[INFO] [stderr]     Checking zip v6.0.0
[INFO] [stderr]     Checking rustls-webpki v0.103.9
[INFO] [stderr]     Checking tokio-rustls v0.26.4
[INFO] [stderr]     Checking ssl_trait v0.1.3
[INFO] [stderr]     Checking fred v10.1.0
[INFO] [stderr]     Checking hickory-proto v0.26.0-alpha.1
[INFO] [stderr]     Checking idot v0.1.2
[INFO] [stderr]     Checking hickory-resolver v0.26.0-alpha.1
[INFO] [stderr]     Checking mail-auth v0.7.5
[INFO] [stderr]     Checking mail-send v0.5.2
[INFO] [stderr]     Checking mail_struct v0.1.21
[INFO] [stderr]     Checking smtp_recv v0.1.65
[INFO] [stderr]     Checking smtp_send v0.1.29
[INFO] [stderr]     Checking xkv v0.1.51
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/xkv-0.1.51/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(macro_metavar_expr)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `xkv` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b6749d77252c8e28fa6adf7e2ee1bbb7b4d989bc43e2d667855bf55afe976cda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6749d77252c8e28fa6adf7e2ee1bbb7b4d989bc43e2d667855bf55afe976cda", kill_on_drop: false }`
[INFO] [stdout] b6749d77252c8e28fa6adf7e2ee1bbb7b4d989bc43e2d667855bf55afe976cda