[INFO] fetching crate varies 0.1.1...
[INFO] testing varies-0.1.1 against try#33835004928d3bf65db4d4712e1330766263b0bd for pr-155739-1
[INFO] extracting crate varies 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate varies 0.1.1
[INFO] finished tweaking crates.io crate varies 0.1.1
[INFO] tweaked toml for crates.io crate varies 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate varies 0.1.1 on toolchain 33835004928d3bf65db4d4712e1330766263b0bd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate varies 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c3e71609dd0979ec6c64d118c11074b153403a70c4b042ac08aa4ef2b4ae9ca
[INFO] running `Command { std: "docker" "start" "-a" "2c3e71609dd0979ec6c64d118c11074b153403a70c4b042ac08aa4ef2b4ae9ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c3e71609dd0979ec6c64d118c11074b153403a70c4b042ac08aa4ef2b4ae9ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c3e71609dd0979ec6c64d118c11074b153403a70c4b042ac08aa4ef2b4ae9ca", kill_on_drop: false }`
[INFO] [stdout] 2c3e71609dd0979ec6c64d118c11074b153403a70c4b042ac08aa4ef2b4ae9ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] af403911d7a9e158b8215255119cd35d44299cc5d529525fd6e8cc40fa680172
[INFO] running `Command { std: "docker" "start" "-a" "af403911d7a9e158b8215255119cd35d44299cc5d529525fd6e8cc40fa680172", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.77
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling varies v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
[INFO] [stdout]   --> src/lib.rs:77:26
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let attrs = unsafe { &mut *(attrs as *const _ as *mut _) };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
[INFO] [stdout]    = note: `#[deny(invalid_reference_casting)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `varies` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "af403911d7a9e158b8215255119cd35d44299cc5d529525fd6e8cc40fa680172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af403911d7a9e158b8215255119cd35d44299cc5d529525fd6e8cc40fa680172", kill_on_drop: false }`
[INFO] [stdout] af403911d7a9e158b8215255119cd35d44299cc5d529525fd6e8cc40fa680172
