[INFO] fetching crate keymatrix 0.1.2...
[INFO] checking keymatrix-0.1.2 against try#4a23c45c7893f1416456144e3883cc48ea91722e for pr-82322
[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 4a23c45c7893f1416456144e3883cc48ea91722e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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 `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mashup v0.1.12
[INFO] [stderr]   Downloaded mashup-impl v0.1.12
[INFO] [stderr]   Downloaded panic-abort v0.2.0
[INFO] [stderr]   Downloaded cortex-m-rtfm-macros v0.3.2
[INFO] [stderr]   Downloaded rtfm-syntax v0.3.4
[INFO] [stderr]   Downloaded rtfm-core v0.2.0
[INFO] [stderr]   Downloaded samd21_mini v0.1.2
[INFO] [stderr]   Downloaded cortex-m-rtfm v0.3.4
[INFO] [stderr]   Downloaded atsamd-hal v0.4.1
[INFO] [stderr]   Downloaded atsamd21-hal v0.2.1
[INFO] [stderr]   Downloaded samd21g18a v0.2.1
[INFO] [stderr]   Downloaded atsamd21g18a v0.4.0
[INFO] [stderr]   Downloaded atsamd21g18a v0.3.1
[INFO] running `Command { std: "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" "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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 48a68066845636faf1682bf7063647a24b8bd90cd0a8e22f47042c9d1df0e4e8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "48a68066845636faf1682bf7063647a24b8bd90cd0a8e22f47042c9d1df0e4e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48a68066845636faf1682bf7063647a24b8bd90cd0a8e22f47042c9d1df0e4e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48a68066845636faf1682bf7063647a24b8bd90cd0a8e22f47042c9d1df0e4e8", kill_on_drop: false }`
[INFO] [stdout] 48a68066845636faf1682bf7063647a24b8bd90cd0a8e22f47042c9d1df0e4e8
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4a23c45c7893f1416456144e3883cc48ea91722e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a8c96c0bbd0ec9e9accd3c50281e2e10a8a5eb8a70a315d3be6d6669e5c4320
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8a8c96c0bbd0ec9e9accd3c50281e2e10a8a5eb8a70a315d3be6d6669e5c4320", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.4.2
[INFO] [stderr]    Compiling cortex-m-rt v0.6.13
[INFO] [stderr]    Compiling atsamd21g18a v0.4.0
[INFO] [stderr]     Checking bare-metal v0.1.3
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]     Checking aligned v0.1.2
[INFO] [stderr]    Compiling cortex-m v0.4.3
[INFO] [stderr]    Compiling atsamd21g18a v0.3.1
[INFO] [stderr]    Compiling cortex-m v0.3.1
[INFO] [stderr]     Checking untagged-option v0.1.1
[INFO] [stderr]    Compiling cortex-m-rtfm v0.3.4
[INFO] [stderr]     Checking rtfm-core v0.2.0
[INFO] [stdout] error[E0740]: unions may not contain fields that need dropping
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub some: T,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `std::mem::ManuallyDrop` can be used to wrap the type
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub some: T,
[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 E0740`.
[INFO] [stdout] 
[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 `Command { std: "docker" "inspect" "8a8c96c0bbd0ec9e9accd3c50281e2e10a8a5eb8a70a315d3be6d6669e5c4320", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a8c96c0bbd0ec9e9accd3c50281e2e10a8a5eb8a70a315d3be6d6669e5c4320", kill_on_drop: false }`
[INFO] [stdout] 8a8c96c0bbd0ec9e9accd3c50281e2e10a8a5eb8a70a315d3be6d6669e5c4320