[INFO] fetching crate ruduino 0.3.2...
[INFO] testing ruduino-0.3.2 against 1.91.0 for beta-1.92-2
[INFO] extracting crate ruduino 0.3.2 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate ruduino 0.3.2
[INFO] finished tweaking crates.io crate ruduino 0.3.2
[INFO] tweaked toml for crates.io crate ruduino 0.3.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ruduino 0.3.2 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ruduino 0.3.2 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded target-cpu-macro v0.1.3
[INFO] [stderr]   Downloaded quote v1.0.8
[INFO] [stderr]   Downloaded avr-std-stub v1.0.2
[INFO] [stderr]   Downloaded avr-config v1.0.0
[INFO] [stderr]   Downloaded const_env--value v0.1.2
[INFO] [stderr]   Downloaded target-cpu-fetch v0.1.3
[INFO] [stderr]   Downloaded avr_delay v0.3.1
[INFO] [stderr]   Downloaded avr-config v2.0.1
[INFO] [stderr]   Downloaded const_env_impl--value v0.1.2
[INFO] [stderr]   Downloaded xml-rs v0.8.3
[INFO] [stderr]   Downloaded xmltree v0.10.2
[INFO] [stderr]   Downloaded syn v1.0.60
[INFO] [stderr]   Downloaded avr-mcu v0.3.5
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e9f76a9c769c4b8573d10ac8c2e68dfe7cf74235ec25d11c4fadfa0355949693
[INFO] running `Command { std: "docker" "start" "-a" "e9f76a9c769c4b8573d10ac8c2e68dfe7cf74235ec25d11c4fadfa0355949693", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e9f76a9c769c4b8573d10ac8c2e68dfe7cf74235ec25d11c4fadfa0355949693", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9f76a9c769c4b8573d10ac8c2e68dfe7cf74235ec25d11c4fadfa0355949693", kill_on_drop: false }`
[INFO] [stdout] e9f76a9c769c4b8573d10ac8c2e68dfe7cf74235ec25d11c4fadfa0355949693
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 12b7e9fb20b84ec158c5518edaa55770a1755a725beaf8ae4241f2b71c8c529f
[INFO] running `Command { std: "docker" "start" "-a" "12b7e9fb20b84ec158c5518edaa55770a1755a725beaf8ae4241f2b71c8c529f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling json v0.12.4
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling avr-std-stub v1.0.2
[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/avr-std-stub-1.0.2/src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(lang_items)]
[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 `avr-std-stub` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "12b7e9fb20b84ec158c5518edaa55770a1755a725beaf8ae4241f2b71c8c529f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12b7e9fb20b84ec158c5518edaa55770a1755a725beaf8ae4241f2b71c8c529f", kill_on_drop: false }`
[INFO] [stdout] 12b7e9fb20b84ec158c5518edaa55770a1755a725beaf8ae4241f2b71c8c529f