[INFO] fetching crate stm32l4-hal 0.3.0...
[INFO] testing stm32l4-hal-0.3.0 against 1.100.0-beta.1 for beta-1.100-2
[INFO] extracting crate stm32l4-hal 0.3.0 into /workspace/builds/worker-4-tc2/source
[INFO] removed /workspace/builds/worker-4-tc2/source/.cargo/config
[INFO] started tweaking crates.io crate stm32l4-hal 0.3.0
[INFO] finished tweaking crates.io crate stm32l4-hal 0.3.0
[INFO] tweaked toml for crates.io crate stm32l4-hal 0.3.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate stm32l4-hal 0.3.0 on toolchain 1.100.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "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" "+1.100.0-beta.1" "generate-lockfile" "--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]      Locking 40 packages to highest compatible versions
[INFO] [stderr]       Adding cast v0.2.7 (available: v0.3.0)
[INFO] [stderr]       Adding cortex-m v0.5.11 (available: v0.7.9)
[INFO] [stderr]       Adding cortex-m-rt v0.6.15 (available: v0.7.7)
[INFO] [stderr]       Adding cortex-m-semihosting v0.3.7 (available: v0.6.0)
[INFO] [stderr]       Adding embedded-hal v0.2.7 (available: v1.0.0)
[INFO] [stderr]       Adding nb v0.1.3 (available: v1.1.0)
[INFO] [stderr]       Adding panic-semihosting v0.5.6 (available: v0.7.0)
[INFO] [stderr]       Adding stm32l4 v0.4.0 (available: v0.16.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f
[INFO] running `Command { std: "docker" "start" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling typenum v1.20.1
[INFO] [stderr]    Compiling cortex-m-macros v0.7.8
[INFO] [stderr]    Compiling nb v1.1.0
[INFO] [stderr]    Compiling cortex-m v0.7.9
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling stable_deref_trait v1.2.1
[INFO] [stderr]    Compiling vcell v0.1.3
[INFO] [stderr]    Compiling critical-section v1.2.0
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling embedded-hal v1.0.0
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]    Compiling cortex-m v0.5.11
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]    Compiling syn v2.0.119
[INFO] [stderr]    Compiling aligned v0.2.0
[INFO] [stderr]    Compiling stm32l4 v0.4.0
[INFO] [stderr]    Compiling volatile-register v0.2.2
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling embedded-hal v0.2.7
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling generic-array v0.14.9
[INFO] [stderr]    Compiling generic-array v0.12.4
[INFO] [stderr]    Compiling generic-array v0.13.3
[INFO] [stderr]    Compiling as-slice v0.1.5
[INFO] [stderr]    Compiling aligned v0.3.5
[INFO] [stderr]    Compiling stm32l4-hal v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(unsize)]
[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 `stm32l4-hal` (lib) due to 1 previous error
[INFO] [stderr] warning: unused dependency `cast`
[INFO] [stderr]  --> Cargo.toml:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | [dependencies.cast]
[INFO] [stderr]   |               ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::unused_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the dependency on `cast`
[INFO] [stderr] warning: `stm32l4-hal` (manifest) generated 1 warning
[INFO] running `Command { std: "docker" "inspect" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f", kill_on_drop: false }`
[INFO] [stdout] fe47f47e32e89671eb642a2c34f53354ab405bdde1be95a6e458e8cdb25c434f
