[INFO] fetching crate st7735-async-low 0.0.2...
[INFO] testing st7735-async-low-0.0.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate st7735-async-low 0.0.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate st7735-async-low 0.0.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate st7735-async-low 0.0.2
[INFO] finished tweaking crates.io crate st7735-async-low 0.0.2
[INFO] tweaked toml for crates.io crate st7735-async-low 0.0.2 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e32df2ada4fadc9aafc1ce5e1aeede2e0742bcf916f86106bef564fa5a010d65
[INFO] running `Command { std: "docker" "start" "-a" "e32df2ada4fadc9aafc1ce5e1aeede2e0742bcf916f86106bef564fa5a010d65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e32df2ada4fadc9aafc1ce5e1aeede2e0742bcf916f86106bef564fa5a010d65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e32df2ada4fadc9aafc1ce5e1aeede2e0742bcf916f86106bef564fa5a010d65", kill_on_drop: false }`
[INFO] [stdout] e32df2ada4fadc9aafc1ce5e1aeede2e0742bcf916f86106bef564fa5a010d65
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22bd730d80c06a58e0eba662a87d6744f1ce4ae567b03516ed95b6969f83b288
[INFO] running `Command { std: "docker" "start" "-a" "22bd730d80c06a58e0eba662a87d6744f1ce4ae567b03516ed95b6969f83b288", kill_on_drop: false }`
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling st7735-async-low v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.71s
[INFO] running `Command { std: "docker" "inspect" "22bd730d80c06a58e0eba662a87d6744f1ce4ae567b03516ed95b6969f83b288", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22bd730d80c06a58e0eba662a87d6744f1ce4ae567b03516ed95b6969f83b288", kill_on_drop: false }`
[INFO] [stdout] 22bd730d80c06a58e0eba662a87d6744f1ce4ae567b03516ed95b6969f83b288
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c444e67a40fa009ff183f3f68b90cfca211d16389b8d3c9fa08cee187ba0fea9
[INFO] running `Command { std: "docker" "start" "-a" "c444e67a40fa009ff183f3f68b90cfca211d16389b8d3c9fa08cee187ba0fea9", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling predicates-core v1.0.2
[INFO] [stderr]    Compiling normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling treeline v0.1.0
[INFO] [stderr]    Compiling downcast v0.10.0
[INFO] [stderr]    Compiling fragile v1.0.0
[INFO] [stderr]    Compiling tokio v1.11.0
[INFO] [stderr]    Compiling float-cmp v0.8.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/downcast-0.10.0/src/lib.rs:2:34
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "nightly", feature(core_intrinsics, try_from))]
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `downcast` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c444e67a40fa009ff183f3f68b90cfca211d16389b8d3c9fa08cee187ba0fea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c444e67a40fa009ff183f3f68b90cfca211d16389b8d3c9fa08cee187ba0fea9", kill_on_drop: false }`
[INFO] [stdout] c444e67a40fa009ff183f3f68b90cfca211d16389b8d3c9fa08cee187ba0fea9