[INFO] fetching crate wasm-reader 0.2.0...
[INFO] testing wasm-reader-0.2.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate wasm-reader 0.2.0 into /workspace/builds/worker-18/source
[INFO] validating manifest of crates.io crate wasm-reader 0.2.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate wasm-reader 0.2.0
[INFO] finished tweaking crates.io crate wasm-reader 0.2.0
[INFO] tweaked toml for crates.io crate wasm-reader 0.2.0 written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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" "+1.54.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d3ce2a6c00040d91149178322b64c875cd7c8fa8f20206a7a0c0095c25c2e3d
[INFO] running `Command { std: "docker" "start" "-a" "3d3ce2a6c00040d91149178322b64c875cd7c8fa8f20206a7a0c0095c25c2e3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d3ce2a6c00040d91149178322b64c875cd7c8fa8f20206a7a0c0095c25c2e3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d3ce2a6c00040d91149178322b64c875cd7c8fa8f20206a7a0c0095c25c2e3d", kill_on_drop: false }`
[INFO] [stdout] 3d3ce2a6c00040d91149178322b64c875cd7c8fa8f20206a7a0c0095c25c2e3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c140a66c15a80867bc00ae159f1829c6e27a2e7c7c2b9b687120b0974adb2f0b
[INFO] running `Command { std: "docker" "start" "-a" "c140a66c15a80867bc00ae159f1829c6e27a2e7c7c2b9b687120b0974adb2f0b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling frunk_core v0.3.2
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling wasmparser v0.51.4
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling auto_enums_derive v0.7.12
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling derive_utils v0.11.2
[INFO] [stderr]    Compiling derive_utils v0.9.1
[INFO] [stderr]    Compiling auto_enums_core v0.7.12
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]    Compiling derive-parse v0.1.0
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling auto_enums v0.7.12
[INFO] [stderr]    Compiling wasm-reader-traits v0.1.1
[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/wasm-reader-traits-0.1.1/src/lib.rs:1:34
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "nightly", feature(specialization))]
[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 `wasm-reader-traits`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c140a66c15a80867bc00ae159f1829c6e27a2e7c7c2b9b687120b0974adb2f0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c140a66c15a80867bc00ae159f1829c6e27a2e7c7c2b9b687120b0974adb2f0b", kill_on_drop: false }`
[INFO] [stdout] c140a66c15a80867bc00ae159f1829c6e27a2e7c7c2b9b687120b0974adb2f0b
