[INFO] fetching crate scaled 0.0.3...
[INFO] testing scaled-0.0.3 against 1.55.0 for beta-1.56-1
[INFO] extracting crate scaled 0.0.3 into /workspace/builds/worker-29/source
[INFO] validating manifest of crates.io crate scaled 0.0.3 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 scaled 0.0.3
[INFO] finished tweaking crates.io crate scaled 0.0.3
[INFO] tweaked toml for crates.io crate scaled 0.0.3 written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate crates.io crate scaled 0.0.3 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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] 8059a7b3effcfa434166519f5f2246c3882b1faa74fb3534b6a489bf1eb62320
[INFO] running `Command { std: "docker" "start" "-a" "8059a7b3effcfa434166519f5f2246c3882b1faa74fb3534b6a489bf1eb62320", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8059a7b3effcfa434166519f5f2246c3882b1faa74fb3534b6a489bf1eb62320", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8059a7b3effcfa434166519f5f2246c3882b1faa74fb3534b6a489bf1eb62320", kill_on_drop: false }`
[INFO] [stdout] 8059a7b3effcfa434166519f5f2246c3882b1faa74fb3534b6a489bf1eb62320
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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] 15a3cb77c34bad4dac6b46834b2207fd2760e96a3b2c0809a097443797c1513a
[INFO] running `Command { std: "docker" "start" "-a" "15a3cb77c34bad4dac6b46834b2207fd2760e96a3b2c0809a097443797c1513a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling fixed v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling integer-sqrt v0.1.5
[INFO] [stderr]    Compiling euclid v0.22.1
[INFO] [stderr]    Compiling fixed-sqrt v0.2.4
[INFO] [stderr]    Compiling scaled v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(associated_type_defaults)]
[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 `scaled` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "15a3cb77c34bad4dac6b46834b2207fd2760e96a3b2c0809a097443797c1513a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15a3cb77c34bad4dac6b46834b2207fd2760e96a3b2c0809a097443797c1513a", kill_on_drop: false }`
[INFO] [stdout] 15a3cb77c34bad4dac6b46834b2207fd2760e96a3b2c0809a097443797c1513a