[INFO] cloning repository https://github.com/TatriX/html-to-seed
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TatriX/html-to-seed" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTatriX%2Fhtml-to-seed", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTatriX%2Fhtml-to-seed'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9edbd7b6e938c64a29c75f84a2308d7fc7bf88d4
[INFO] testing TatriX/html-to-seed against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTatriX%2Fhtml-to-seed" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TatriX/html-to-seed on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-15/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/TatriX/html-to-seed
[INFO] disabled cargo feature 'default-run' from git repo https://github.com/TatriX/html-to-seed
[INFO] finished tweaking git repo https://github.com/TatriX/html-to-seed
[INFO] tweaked toml for git repo https://github.com/TatriX/html-to-seed written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/TatriX/html-to-seed already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded structopt-derive v0.2.18
[INFO] [stderr]   Downloaded globset v0.4.4
[INFO] [stderr]   Downloaded bytecount v0.5.1
[INFO] [stderr]   Downloaded dirs-sys v0.3.3
[INFO] [stderr]   Downloaded dirs v2.0.1
[INFO] [stderr]   Downloaded rustc-rayon v0.2.0
[INFO] [stderr]   Downloaded rustc-rayon-core v0.2.0
[INFO] [stderr]   Downloaded redox_syscall v0.1.55
[INFO] [stderr]   Downloaded rustc-ap-rustc_errors v491.0.0
[INFO] [stderr]   Downloaded annotate-snippets v0.5.0
[INFO] [stderr]   Downloaded markup5ever v0.8.1
[INFO] [stderr]   Downloaded rustc-ap-graphviz v491.0.0
[INFO] [stderr]   Downloaded cargo_metadata v0.8.0
[INFO] [stderr]   Downloaded jobserver v0.1.14
[INFO] [stderr]   Downloaded rustfmt-config_proc_macro v0.1.2
[INFO] [stderr]   Downloaded derive-new v0.5.6
[INFO] [stderr]   Downloaded rustc-ap-arena v491.0.0
[INFO] [stderr]   Downloaded structopt v0.2.18
[INFO] [stderr]   Downloaded ena v0.13.0
[INFO] [stderr]   Downloaded rustc-ap-syntax v491.0.0
[INFO] [stderr]   Downloaded ignore v0.4.7
[INFO] [stderr]   Downloaded walkdir v2.2.8
[INFO] [stderr]   Downloaded rustc-ap-rustc_target v491.0.0
[INFO] [stderr]   Downloaded html5ever v0.23.0
[INFO] [stderr]   Downloaded rustc-ap-syntax_pos v491.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_data_structures v491.0.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.7
[INFO] [stderr]   Downloaded bstr v0.2.1
[INFO] [stderr]   Downloaded backtrace-sys v0.1.30
[INFO] [stderr]   Downloaded regex v1.1.7
[INFO] [stderr]   Downloaded getopts v0.2.19
[INFO] [stderr]   Downloaded rustfmt-nightly v1.3.1
[INFO] [stderr]   Downloaded rustc-ap-rustc_cratesio_shim v491.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_macros v491.0.0
[INFO] [stderr]   Downloaded rustc-ap-serialize v491.0.0
[INFO] [stderr]   Downloaded backtrace v0.3.32
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea475a8a1e9c3c1a89bafa148bf343816d341c0d732956f27dcf65ed1a864c39
[INFO] running `Command { std: "docker" "start" "-a" "ea475a8a1e9c3c1a89bafa148bf343816d341c0d732956f27dcf65ed1a864c39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea475a8a1e9c3c1a89bafa148bf343816d341c0d732956f27dcf65ed1a864c39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea475a8a1e9c3c1a89bafa148bf343816d341c0d732956f27dcf65ed1a864c39", kill_on_drop: false }`
[INFO] [stdout] ea475a8a1e9c3c1a89bafa148bf343816d341c0d732956f27dcf65ed1a864c39
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7055f41b6437ad2d8d9de8ac42b943390d4fa784b18fdc0117a96cb3540926a
[INFO] running `Command { std: "docker" "start" "-a" "c7055f41b6437ad2d8d9de8ac42b943390d4fa784b18fdc0117a96cb3540926a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling cc v1.0.37
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling rustc-rayon-core v0.2.0
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling rustc-rayon v0.2.0
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]    Compiling ucd-util v0.1.3
[INFO] [stderr]    Compiling yansi v0.4.0
[INFO] [stderr]    Compiling rustc-ap-graphviz v491.0.0
[INFO] [stderr]    Compiling regex v1.1.7
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]    Compiling utf8-ranges v1.0.3
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling safemem v0.3.0
[INFO] [stderr]    Compiling yansi v0.5.0
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.3
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling untrusted v0.6.2
[INFO] [stderr]    Compiling rustc-demangle v0.1.15
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.10/lib.rs:33:32
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![cfg_attr(feature = "union", feature(untagged_unions))]
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.10/lib.rs:35:37
[INFO] [stdout]    |
[INFO] [stdout] 35 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling mac v0.1.1
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-graphviz-491.0.0/lib.rs:279:1
[INFO] [stdout]     |
[INFO] [stdout] 279 | #![feature(rustc_private, nll)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smallvec` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c7055f41b6437ad2d8d9de8ac42b943390d4fa784b18fdc0117a96cb3540926a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7055f41b6437ad2d8d9de8ac42b943390d4fa784b18fdc0117a96cb3540926a", kill_on_drop: false }`
[INFO] [stdout] c7055f41b6437ad2d8d9de8ac42b943390d4fa784b18fdc0117a96cb3540926a