[INFO] fetching crate ruspiro-allocator 0.4.6...
[INFO] testing ruspiro-allocator-0.4.6 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ruspiro-allocator 0.4.6 into /workspace/builds/worker-4-tc1/source
[INFO] removed /workspace/builds/worker-4-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate ruspiro-allocator 0.4.6
[INFO] finished tweaking crates.io crate ruspiro-allocator 0.4.6
[INFO] tweaked toml for crates.io crate ruspiro-allocator 0.4.6 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ruspiro-allocator 0.4.6 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 1 package to latest compatible version
[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 rlibc v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] d28e122af35dff727613c6a307bfd5a476a7f70a46b3e3dd2ee6eda860ff0313
[INFO] running `Command { std: "docker" "start" "-a" "d28e122af35dff727613c6a307bfd5a476a7f70a46b3e3dd2ee6eda860ff0313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d28e122af35dff727613c6a307bfd5a476a7f70a46b3e3dd2ee6eda860ff0313", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d28e122af35dff727613c6a307bfd5a476a7f70a46b3e3dd2ee6eda860ff0313", kill_on_drop: false }`
[INFO] [stdout] d28e122af35dff727613c6a307bfd5a476a7f70a46b3e3dd2ee6eda860ff0313
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] b763bf6aa4b355cc910e86cfad4c5b7ff0fc19d6f6775cec6718ec93b94945a8
[INFO] running `Command { std: "docker" "start" "-a" "b763bf6aa4b355cc910e86cfad4c5b7ff0fc19d6f6775cec6718ec93b94945a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruspiro-allocator v0.4.6 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rlibc v1.0.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(alloc_error_handler)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/memory.rs:305:7
[INFO] [stdout]     |
[INFO] [stdout] 305 |   let mut descriptor = unsafe { &mut *(descriptor_addr as *mut MemoryDescriptor) };
[INFO] [stdout]     |       ----^^^^^^^^^^
[INFO] [stdout]     |       |
[INFO] [stdout]     |       help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ruspiro-allocator` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "b763bf6aa4b355cc910e86cfad4c5b7ff0fc19d6f6775cec6718ec93b94945a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b763bf6aa4b355cc910e86cfad4c5b7ff0fc19d6f6775cec6718ec93b94945a8", kill_on_drop: false }`
[INFO] [stdout] b763bf6aa4b355cc910e86cfad4c5b7ff0fc19d6f6775cec6718ec93b94945a8