[INFO] fetching crate fls 0.1.0...
[INFO] testing fls-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate fls 0.1.0 into /workspace/builds/worker-108/source
[INFO] validating manifest of crates.io crate fls 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 fls 0.1.0
[INFO] finished tweaking crates.io crate fls 0.1.0
[INFO] tweaked toml for crates.io crate fls 0.1.0 written to /workspace/builds/worker-108/source/Cargo.toml
[INFO] crate crates.io crate fls 0.1.0 already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded veneer v0.1.0
[INFO] [stderr]   Downloaded compiler_builtins v0.1.47
[INFO] [stderr]   Downloaded sc v0.2.4
[INFO] [stderr]   Downloaded veneer-macros v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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] 3fb994a3d3aae0451c2801d3cfe5072dccb253fb7a9d61e02aba31985a14efa6
[INFO] running `Command { std: "docker" "start" "-a" "3fb994a3d3aae0451c2801d3cfe5072dccb253fb7a9d61e02aba31985a14efa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fb994a3d3aae0451c2801d3cfe5072dccb253fb7a9d61e02aba31985a14efa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fb994a3d3aae0451c2801d3cfe5072dccb253fb7a9d61e02aba31985a14efa6", kill_on_drop: false }`
[INFO] [stdout] 3fb994a3d3aae0451c2801d3cfe5072dccb253fb7a9d61e02aba31985a14efa6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-108/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] 50896e432c11bb3b840ba0520d3222a46718db8c6bcb86271a8174e50059dcc8
[INFO] running `Command { std: "docker" "start" "-a" "50896e432c11bb3b840ba0520d3222a46718db8c6bcb86271a8174e50059dcc8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling compiler_builtins v0.1.47
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling sc v0.2.4
[INFO] [stderr]    Compiling fls v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling veneer-macros v0.1.0
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling tinyvec v1.3.1
[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/veneer-macros-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic, proc_macro_span, proc_macro_quote)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[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/sc-0.2.4/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[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 `veneer-macros` 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" "50896e432c11bb3b840ba0520d3222a46718db8c6bcb86271a8174e50059dcc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50896e432c11bb3b840ba0520d3222a46718db8c6bcb86271a8174e50059dcc8", kill_on_drop: false }`
[INFO] [stdout] 50896e432c11bb3b840ba0520d3222a46718db8c6bcb86271a8174e50059dcc8