[INFO] fetching crate vtables_derive 0.1.0...
[INFO] testing vtables_derive-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate vtables_derive 0.1.0 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate vtables_derive 0.1.0 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 vtables_derive 0.1.0
[INFO] finished tweaking crates.io crate vtables_derive 0.1.0
[INFO] tweaked toml for crates.io crate vtables_derive 0.1.0 written to /workspace/builds/worker-19/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vtables v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] 29405cffcbc777cc6067dc75340fa9a693268b1bb8c300fbc341db3b61382cef
[INFO] running `Command { std: "docker" "start" "-a" "29405cffcbc777cc6067dc75340fa9a693268b1bb8c300fbc341db3b61382cef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29405cffcbc777cc6067dc75340fa9a693268b1bb8c300fbc341db3b61382cef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29405cffcbc777cc6067dc75340fa9a693268b1bb8c300fbc341db3b61382cef", kill_on_drop: false }`
[INFO] [stdout] 29405cffcbc777cc6067dc75340fa9a693268b1bb8c300fbc341db3b61382cef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] c837ec532077222a2ffc0711b33013fb9691071d77f861aeaa2f25db7ef7b396
[INFO] running `Command { std: "docker" "start" "-a" "c837ec532077222a2ffc0711b33013fb9691071d77f861aeaa2f25db7ef7b396", kill_on_drop: false }`
[INFO] [stderr]    Compiling vtables_derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.86s
[INFO] running `Command { std: "docker" "inspect" "c837ec532077222a2ffc0711b33013fb9691071d77f861aeaa2f25db7ef7b396", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c837ec532077222a2ffc0711b33013fb9691071d77f861aeaa2f25db7ef7b396", kill_on_drop: false }`
[INFO] [stdout] c837ec532077222a2ffc0711b33013fb9691071d77f861aeaa2f25db7ef7b396
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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] cb033065df82cc7237cbfa173064a5ccac6aa215edf86f99c7120f7894b9c7a4
[INFO] running `Command { std: "docker" "start" "-a" "cb033065df82cc7237cbfa173064a5ccac6aa215edf86f99c7120f7894b9c7a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling vtables v0.1.0
[INFO] [stderr]    Compiling vtables_derive v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/tests.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(abi_thiscall)]
[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 `vtables_derive` 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" "cb033065df82cc7237cbfa173064a5ccac6aa215edf86f99c7120f7894b9c7a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb033065df82cc7237cbfa173064a5ccac6aa215edf86f99c7120f7894b9c7a4", kill_on_drop: false }`
[INFO] [stdout] cb033065df82cc7237cbfa173064a5ccac6aa215edf86f99c7120f7894b9c7a4