[INFO] fetching crate monarch2 0.1.0-beta.1...
[INFO] testing monarch2-0.1.0-beta.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate monarch2 0.1.0-beta.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate monarch2 0.1.0-beta.1
[INFO] finished tweaking crates.io crate monarch2 0.1.0-beta.1
[INFO] tweaked toml for crates.io crate monarch2 0.1.0-beta.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate monarch2 0.1.0-beta.1 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 monarch2 0.1.0-beta.1 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 defmt v1.0.1
[INFO] [stderr]   Downloaded embedded-hal-async v1.0.0
[INFO] [stderr]   Downloaded defmt v0.3.100
[INFO] [stderr]   Downloaded defmt-parser v1.0.0
[INFO] [stderr]   Downloaded embassy-futures v0.1.1
[INFO] [stderr]   Downloaded embassy-sync v0.6.2
[INFO] [stderr]   Downloaded atat v0.24.0
[INFO] [stderr]   Downloaded embassy-sync v0.7.0
[INFO] [stderr]   Downloaded heapless-bytes v0.4.0
[INFO] [stderr]   Downloaded embassy-time-driver v0.2.0
[INFO] [stderr]   Downloaded embedded-hal v0.2.7
[INFO] [stderr]   Downloaded embassy-time v0.4.0
[INFO] [stderr]   Downloaded nb v0.1.3
[INFO] [stderr]   Downloaded static_cell v2.1.1
[INFO] [stderr]   Downloaded defmt-macros v1.0.1
[INFO] [stderr]   Downloaded atat_derive v0.24.0
[INFO] [stderr]   Downloaded serde_at v0.24.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f1e505f13274d8dc683f3a88a56d8722854a14a3882215ecf348a8a8da1480d5
[INFO] running `Command { std: "docker" "start" "-a" "f1e505f13274d8dc683f3a88a56d8722854a14a3882215ecf348a8a8da1480d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1e505f13274d8dc683f3a88a56d8722854a14a3882215ecf348a8a8da1480d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1e505f13274d8dc683f3a88a56d8722854a14a3882215ecf348a8a8da1480d5", kill_on_drop: false }`
[INFO] [stdout] f1e505f13274d8dc683f3a88a56d8722854a14a3882215ecf348a8a8da1480d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 413af4fceb3b199fce4d6adcecaa9c83004f1ba3e60b7e5f65dce689af1f5353
[INFO] running `Command { std: "docker" "start" "-a" "413af4fceb3b199fce4d6adcecaa9c83004f1ba3e60b7e5f65dce689af1f5353", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling futures-sink v0.3.31
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling heapless v0.8.0
[INFO] [stderr]    Compiling embedded-io-async v0.6.1
[INFO] [stderr]    Compiling nb v1.1.0
[INFO] [stderr]    Compiling embassy-time-driver v0.2.0
[INFO] [stderr]    Compiling litrs v0.4.1
[INFO] [stderr]    Compiling embedded-io v0.6.1
[INFO] [stderr]    Compiling embedded-hal-async v1.0.0
[INFO] [stderr]    Compiling critical-section v1.2.0
[INFO] [stderr]    Compiling embedded-hal v1.0.0
[INFO] [stderr]    Compiling portable-atomic v1.11.1
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling embassy-sync v0.6.2
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling embassy-sync v0.7.0
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling memchr v2.7.5
[INFO] [stderr]    Compiling futures-io v0.3.31
[INFO] [stderr]    Compiling embedded-hal v0.2.7
[INFO] [stderr]    Compiling embassy-futures v0.1.1
[INFO] [stderr]    Compiling document-features v0.2.11
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling static_cell v2.1.1
[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/static_cell-2.1.1/src/lib.rs:4:34
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "nightly", feature(type_alias_impl_trait))] // for tests
[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 `static_cell` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "413af4fceb3b199fce4d6adcecaa9c83004f1ba3e60b7e5f65dce689af1f5353", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "413af4fceb3b199fce4d6adcecaa9c83004f1ba3e60b7e5f65dce689af1f5353", kill_on_drop: false }`
[INFO] [stdout] 413af4fceb3b199fce4d6adcecaa9c83004f1ba3e60b7e5f65dce689af1f5353