[INFO] fetching crate fe_rtos 0.1.1...
[INFO] testing fe_rtos-0.1.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate fe_rtos 0.1.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate fe_rtos 0.1.1
[INFO] finished tweaking crates.io crate fe_rtos 0.1.1
[INFO] tweaked toml for crates.io crate fe_rtos 0.1.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fe_rtos 0.1.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 35 packages to latest compatible versions
[INFO] [stderr]       Adding cortex-m v0.6.7 (available: v0.7.7)
[INFO] [stderr]       Adding crossbeam-queue v0.2.3 (available: v0.3.12)
[INFO] [stderr]       Adding cstr_core v0.1.2 (available: v0.2.6)
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded fe_osi v0.1.1
[INFO] [stderr]   Downloaded cstr_core v0.1.2
[INFO] [stderr]   Downloaded cty v0.1.5
[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] 4beba43951a7f0ae84190cdd52479ea837160513522fc39347346a13bea9e957
[INFO] running `Command { std: "docker" "start" "-a" "4beba43951a7f0ae84190cdd52479ea837160513522fc39347346a13bea9e957", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4beba43951a7f0ae84190cdd52479ea837160513522fc39347346a13bea9e957", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4beba43951a7f0ae84190cdd52479ea837160513522fc39347346a13bea9e957", kill_on_drop: false }`
[INFO] [stdout] 4beba43951a7f0ae84190cdd52479ea837160513522fc39347346a13bea9e957
[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] 3ef285b96d048e6f9ad05de7504ed7ce9b9b69bcefe6df72f4d364c9819bb787
[INFO] running `Command { std: "docker" "start" "-a" "3ef285b96d048e6f9ad05de7504ed7ce9b9b69bcefe6df72f4d364c9819bb787", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling cty v0.1.5
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling fe_osi v0.1.1
[INFO] [stderr]    Compiling fe_rtos v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling cstr_core v0.1.2
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[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/cstr_core-0.1.2/src/lib.rs:12:32
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "alloc", feature(alloc))]
[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 `cstr_core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3ef285b96d048e6f9ad05de7504ed7ce9b9b69bcefe6df72f4d364c9819bb787", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ef285b96d048e6f9ad05de7504ed7ce9b9b69bcefe6df72f4d364c9819bb787", kill_on_drop: false }`
[INFO] [stdout] 3ef285b96d048e6f9ad05de7504ed7ce9b9b69bcefe6df72f4d364c9819bb787
