[INFO] crate arduino_mkrzero 0.5.0 is already in cache
[INFO] checking arduino_mkrzero-0.5.0 against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] extracting crate arduino_mkrzero 0.5.0 into work/builds/worker-4/source
[INFO] validating manifest of crates.io crate arduino_mkrzero 0.5.0 on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate arduino_mkrzero 0.5.0
[INFO] finished tweaking crates.io crate arduino_mkrzero 0.5.0
[INFO] tweaked toml for crates.io crate arduino_mkrzero 0.5.0 written to work/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate arduino_mkrzero 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] ce698306e33f076b10daa430e5e19d38133cddf2bd1932440fb6a7684ac63766
[INFO] running `"docker" "start" "-a" "ce698306e33f076b10daa430e5e19d38133cddf2bd1932440fb6a7684ac63766"`
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling cortex-m-rt v0.6.7
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]    Compiling atsamd21g18a v0.6.0
[INFO] [stderr]     Checking nb v0.1.1
[INFO] [stderr]    Compiling arduino_mkrzero v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bitfield v0.13.1
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling syn v0.15.27
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]     Checking embedded-hal v0.2.3
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]     Checking cortex-m v0.6.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.4
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.5
[INFO] [stderr]    Compiling paste-impl v0.1.4
[INFO] [stderr]     Checking paste v0.1.4
[INFO] [stderr]     Checking atsamd-hal v0.7.0
[INFO] [stderr] error: duplicate lang item in crate `std`: `panic_impl`.
[INFO] [stderr]   |
[INFO] [stderr]   = note: first defined in crate `panic_halt`.
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `arduino_mkrzero`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: language item required, but not found: `eh_personality`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `arduino_mkrzero`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ce698306e33f076b10daa430e5e19d38133cddf2bd1932440fb6a7684ac63766"`
[INFO] running `"docker" "rm" "-f" "ce698306e33f076b10daa430e5e19d38133cddf2bd1932440fb6a7684ac63766"`
[INFO] [stdout] ce698306e33f076b10daa430e5e19d38133cddf2bd1932440fb6a7684ac63766