[INFO] fetching crate raca_std 16.0.0...
[INFO] testing raca_std-16.0.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate raca_std 16.0.0 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate raca_std 16.0.0
[INFO] finished tweaking crates.io crate raca_std 16.0.0
[INFO] tweaked toml for crates.io crate raca_std 16.0.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate raca_std 16.0.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate raca_std 16.0.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unwinding v0.2.4
[INFO] [stderr]   Downloaded syscall_macro v0.1.0
[INFO] [stderr]   Downloaded talc v4.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 324e65eeaf5e4d8d95d02f8b8021c517eb15108e55107a7d495f1b761a395720
[INFO] running `Command { std: "docker" "start" "-a" "324e65eeaf5e4d8d95d02f8b8021c517eb15108e55107a7d495f1b761a395720", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "324e65eeaf5e4d8d95d02f8b8021c517eb15108e55107a7d495f1b761a395720", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "324e65eeaf5e4d8d95d02f8b8021c517eb15108e55107a7d495f1b761a395720", kill_on_drop: false }`
[INFO] [stdout] 324e65eeaf5e4d8d95d02f8b8021c517eb15108e55107a7d495f1b761a395720
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ebde6ecc6edb40618807237bc6b6bbc30e08a96aeb8e7e3afafd2b7bf71559ed
[INFO] running `Command { std: "docker" "start" "-a" "ebde6ecc6edb40618807237bc6b6bbc30e08a96aeb8e7e3afafd2b7bf71559ed", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling unicode-ident v1.0.14
[INFO] [stderr]    Compiling gimli v0.31.1
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling talc v4.4.2
[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/talc-4.4.2/src/lib.rs:12:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "allocator", feature(allocator_api))]
[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 `talc` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ebde6ecc6edb40618807237bc6b6bbc30e08a96aeb8e7e3afafd2b7bf71559ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebde6ecc6edb40618807237bc6b6bbc30e08a96aeb8e7e3afafd2b7bf71559ed", kill_on_drop: false }`
[INFO] [stdout] ebde6ecc6edb40618807237bc6b6bbc30e08a96aeb8e7e3afafd2b7bf71559ed