[INFO] crate keymatrix 0.1.2 is already in cache
[INFO] testing keymatrix-0.1.2 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate keymatrix 0.1.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate keymatrix 0.1.2 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate keymatrix 0.1.2
[INFO] finished tweaking crates.io crate keymatrix 0.1.2
[INFO] tweaked toml for crates.io crate keymatrix 0.1.2 written to /workspace/builds/worker-5/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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 9e4c38962bbe0cb3b975b96d83804cbdddcbac5ff6639722fff422700963e285
[INFO] running `"docker" "start" "-a" "9e4c38962bbe0cb3b975b96d83804cbdddcbac5ff6639722fff422700963e285"`
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling cortex-m v0.6.2
[INFO] [stderr]    Compiling vcell v0.1.2
[INFO] [stderr]    Compiling nb v0.1.2
[INFO] [stderr]    Compiling generic-array v0.13.2
[INFO] [stderr]    Compiling generic-array v0.11.1
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling embedded-hal v0.2.3
[INFO] [stderr]    Compiling cortex-m v0.5.10
[INFO] [stderr]    Compiling as-slice v0.1.3
[INFO] [stderr]    Compiling aligned v0.3.2
[INFO] [stderr]    Compiling keymatrix v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.36s
[INFO] running `"docker" "inspect" "9e4c38962bbe0cb3b975b96d83804cbdddcbac5ff6639722fff422700963e285"`
[INFO] running `"docker" "rm" "-f" "9e4c38962bbe0cb3b975b96d83804cbdddcbac5ff6639722fff422700963e285"`
[INFO] [stdout] 9e4c38962bbe0cb3b975b96d83804cbdddcbac5ff6639722fff422700963e285
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 120af473b7a50ad6fe347658966c63f4a357cdd85542602aa834bdce4795926f
[INFO] running `"docker" "start" "-a" "120af473b7a50ad6fe347658966c63f4a357cdd85542602aa834bdce4795926f"`
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]    Compiling bare-metal v0.1.3
[INFO] [stderr]    Compiling atsamd21g18a v0.4.0
[INFO] [stderr]    Compiling aligned v0.1.2
[INFO] [stderr]    Compiling cortex-m v0.4.3
[INFO] [stderr]    Compiling cortex-m v0.3.1
[INFO] [stderr]    Compiling atsamd21g18a v0.3.1
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling untagged-option v0.1.1
[INFO] [stderr] error[E0740]: unions may not contain fields that need dropping
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:53:5
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub some: T,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `std::mem::ManuallyDrop` can be used to wrap the type
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:53:5
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub some: T,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0740`.
[INFO] [stderr] error: could not compile `untagged-option`.
[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 `"docker" "inspect" "120af473b7a50ad6fe347658966c63f4a357cdd85542602aa834bdce4795926f"`
[INFO] running `"docker" "rm" "-f" "120af473b7a50ad6fe347658966c63f4a357cdd85542602aa834bdce4795926f"`
[INFO] [stdout] 120af473b7a50ad6fe347658966c63f4a357cdd85542602aa834bdce4795926f