[INFO] fetching crate math_64 0.1.0...
[INFO] testing math_64-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate math_64 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate math_64 0.1.0
[INFO] finished tweaking crates.io crate math_64 0.1.0
[INFO] tweaked toml for crates.io crate math_64 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate math_64 0.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 3 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded log_64 v0.1.1
[INFO] [stderr]   Downloaded mem_64 v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e7025aa78c2c1ec7897f72f4a726c4be076cf637e7b6c2ae2611e7609d470b9
[INFO] running `Command { std: "docker" "start" "-a" "6e7025aa78c2c1ec7897f72f4a726c4be076cf637e7b6c2ae2611e7609d470b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e7025aa78c2c1ec7897f72f4a726c4be076cf637e7b6c2ae2611e7609d470b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e7025aa78c2c1ec7897f72f4a726c4be076cf637e7b6c2ae2611e7609d470b9", kill_on_drop: false }`
[INFO] [stdout] 6e7025aa78c2c1ec7897f72f4a726c4be076cf637e7b6c2ae2611e7609d470b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 06bdaa0e51a5a3c7a76c1ed9fbfe97271a79e9292ad53885a94e5d5a9cdf7f8b
[INFO] running `Command { std: "docker" "start" "-a" "06bdaa0e51a5a3c7a76c1ed9fbfe97271a79e9292ad53885a94e5d5a9cdf7f8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling log_64 v0.1.1
[INFO] [stderr]    Compiling mem_64 v0.1.0
[INFO] [stderr]    Compiling math_64 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(core_intrinsics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `math_64` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "06bdaa0e51a5a3c7a76c1ed9fbfe97271a79e9292ad53885a94e5d5a9cdf7f8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06bdaa0e51a5a3c7a76c1ed9fbfe97271a79e9292ad53885a94e5d5a9cdf7f8b", kill_on_drop: false }`
[INFO] [stdout] 06bdaa0e51a5a3c7a76c1ed9fbfe97271a79e9292ad53885a94e5d5a9cdf7f8b