[INFO] fetching crate ffi_helpers 0.2.0...
[INFO] testing ffi_helpers-0.2.0 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate ffi_helpers 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate ffi_helpers 0.2.0 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ffi_helpers 0.2.0
[INFO] finished tweaking crates.io crate ffi_helpers 0.2.0
[INFO] tweaked toml for crates.io crate ffi_helpers 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 685de227a7aba05c4c4628c7ef8a5184bbf99c6a25fe2099bbedbe7dc0a6d5b6
[INFO] running `"docker" "start" "-a" "685de227a7aba05c4c4628c7ef8a5184bbf99c6a25fe2099bbedbe7dc0a6d5b6"`
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]    Compiling backtrace-sys v0.1.35
[INFO] [stderr]    Compiling backtrace v0.3.46
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling failure v0.1.7
[INFO] [stderr]    Compiling ffi_helpers v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0080]: it is undefined behavior to use this value
[INFO] [stderr]   --> src/nullable.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     const NULL: Self = std::ptr::null();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized raw pointer
[INFO] [stderr]    |
[INFO] [stderr]    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
[INFO] [stderr] 
[INFO] [stderr] error[E0080]: it is undefined behavior to use this value
[INFO] [stderr]   --> src/nullable.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     const NULL: Self = std::ptr::null_mut();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized raw pointer
[INFO] [stderr]    |
[INFO] [stderr]    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0080`.
[INFO] [stderr] error: could not compile `ffi_helpers`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "685de227a7aba05c4c4628c7ef8a5184bbf99c6a25fe2099bbedbe7dc0a6d5b6"`
[INFO] running `"docker" "rm" "-f" "685de227a7aba05c4c4628c7ef8a5184bbf99c6a25fe2099bbedbe7dc0a6d5b6"`
[INFO] [stdout] 685de227a7aba05c4c4628c7ef8a5184bbf99c6a25fe2099bbedbe7dc0a6d5b6