[INFO] cloning repository https://github.com/nbc12/STM32-Snake
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nbc12/STM32-Snake" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbc12%2FSTM32-Snake", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbc12%2FSTM32-Snake'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2b08d5721c57830facf141874d0028edd5d46ff9
[INFO] testing nbc12/STM32-Snake against 1.90.0 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbc12%2FSTM32-Snake" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-1-tc1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/nbc12/STM32-Snake
[INFO] finished tweaking git repo https://github.com/nbc12/STM32-Snake
[INFO] tweaked toml for git repo https://github.com/nbc12/STM32-Snake written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nbc12/STM32-Snake 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 git repo https://github.com/nbc12/STM32-Snake 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 cortex-m-rt-macros v0.7.0
[INFO] [stderr]   Downloaded fugit-timer v0.1.3
[INFO] [stderr]   Downloaded bare-metal v1.0.0
[INFO] [stderr]   Downloaded nb v1.0.0
[INFO] [stderr]   Downloaded alloc-cortex-m v0.4.3
[INFO] [stderr]   Downloaded volatile-register v0.2.1
[INFO] [stderr]   Downloaded embedded-dma v0.2.0
[INFO] [stderr]   Downloaded linked_list_allocator v0.10.4
[INFO] [stderr]   Downloaded embedded-hal v1.0.0-alpha.8
[INFO] [stderr]   Downloaded cortex-m-rt v0.7.1
[INFO] [stderr]   Downloaded embedded-storage v0.2.0
[INFO] [stderr]   Downloaded cortex-m v0.7.4
[INFO] [stderr]   Downloaded gcd v2.1.0
[INFO] [stderr]   Downloaded fugit v0.3.6
[INFO] [stderr]   Downloaded stm32f4xx-hal v0.14.0
[INFO] [stderr]   Downloaded stm32f4 v0.15.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 3fd7ce4699a0db73eef7d5ec5901f900db85eb81aeed1348d37f0507e7dcedfa
[INFO] running `Command { std: "docker" "start" "-a" "3fd7ce4699a0db73eef7d5ec5901f900db85eb81aeed1348d37f0507e7dcedfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fd7ce4699a0db73eef7d5ec5901f900db85eb81aeed1348d37f0507e7dcedfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fd7ce4699a0db73eef7d5ec5901f900db85eb81aeed1348d37f0507e7dcedfa", kill_on_drop: false }`
[INFO] [stdout] 3fd7ce4699a0db73eef7d5ec5901f900db85eb81aeed1348d37f0507e7dcedfa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] ea7db18ab754ed88d7f42e514df81b2ed8c682966d4ae348c279746938ae9f36
[INFO] running `Command { std: "docker" "start" "-a" "ea7db18ab754ed88d7f42e514df81b2ed8c682966d4ae348c279746938ae9f36", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling nb v1.0.0
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling cortex-m v0.7.4
[INFO] [stderr]    Compiling cortex-m-rt v0.7.1
[INFO] [stderr]    Compiling vcell v0.1.3
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling stm32f4 v0.15.1
[INFO] [stderr]    Compiling bare-metal v1.0.0
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling gcd v2.1.0
[INFO] [stderr]    Compiling time v0.3.17
[INFO] [stderr]    Compiling embedded-storage v0.2.0
[INFO] [stderr]    Compiling linked_list_allocator v0.10.4
[INFO] [stderr]    Compiling rand_core v0.6.3
[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/linked_list_allocator-0.10.4/src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling embedded-dma v0.2.0
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling volatile-register v0.2.1
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling fugit v0.3.6
[INFO] [stderr]    Compiling embedded-hal v1.0.0-alpha.8
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr] error: could not compile `linked_list_allocator` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "ea7db18ab754ed88d7f42e514df81b2ed8c682966d4ae348c279746938ae9f36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea7db18ab754ed88d7f42e514df81b2ed8c682966d4ae348c279746938ae9f36", kill_on_drop: false }`
[INFO] [stdout] ea7db18ab754ed88d7f42e514df81b2ed8c682966d4ae348c279746938ae9f36