[INFO] fetching crate serde-bindgen-core 0.1.9...
[INFO] testing serde-bindgen-core-0.1.9 against 1.100.0-beta.1 for beta-1.100-2
[INFO] extracting crate serde-bindgen-core 0.1.9 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate serde-bindgen-core 0.1.9
[INFO] finished tweaking crates.io crate serde-bindgen-core 0.1.9
[INFO] tweaked toml for crates.io crate serde-bindgen-core 0.1.9 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde-bindgen-core 0.1.9 on toolchain 1.100.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "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" "+1.100.0-beta.1" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 44 packages to highest compatible versions
[INFO] [stderr]       Adding serde-json-core v0.4.0 (available: v0.6.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5
[INFO] running `Command { std: "docker" "start" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.107
[INFO] [stderr]    Compiling unicode-ident v1.0.26
[INFO] [stderr]    Compiling quote v1.0.47
[INFO] [stderr]    Compiling semver v1.0.28
[INFO] [stderr]    Compiling serde_core v1.0.229
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling serde v1.0.229
[INFO] [stderr]    Compiling stable_deref_trait v1.2.1
[INFO] [stderr]    Compiling ryu v1.0.23
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]    Compiling lock_api v0.4.14
[INFO] [stderr]    Compiling hash32 v0.2.1
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling heapless v0.7.17
[INFO] [stderr]    Compiling spin v0.9.9
[INFO] [stderr]    Compiling syn v3.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.229
[INFO] [stderr]    Compiling serde-bindgen-core-derive v0.1.12
[INFO] [stderr]    Compiling serde-json-core v0.4.0
[INFO] [stderr]    Compiling serde-bindgen-core v0.1.9 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(lang_items)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `lang_items` is internal to the compiler or standard library
[INFO] [stdout]   --> src/lib.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(lang_items)]
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: using it is strongly discouraged
[INFO] [stdout]    = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde-bindgen-core` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5", kill_on_drop: false }`
[INFO] [stdout] 145ff6d4794e503e6d174c4e9ba52373637d6b6d2e4ead6c2aa8ac7c36f342e5
