[INFO] crate panic-halt 0.2.0 is already in cache
[INFO] testing panic-halt-0.2.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate panic-halt 0.2.0 into work/builds/worker-4/source
[INFO] validating manifest of crates.io crate panic-halt 0.2.0 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate panic-halt 0.2.0
[INFO] finished tweaking crates.io crate panic-halt 0.2.0
[INFO] tweaked toml for crates.io crate panic-halt 0.2.0 written to work/builds/worker-4/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/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=warn" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 679565ac0d8edd90a36f1218dc0843b92fdbdcc10f70b5a32b46a6f8af14daf1
[INFO] running `"docker" "start" "-a" "679565ac0d8edd90a36f1218dc0843b92fdbdcc10f70b5a32b46a6f8af14daf1"`
[INFO] [stderr]    Compiling panic-halt v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `"docker" "inspect" "679565ac0d8edd90a36f1218dc0843b92fdbdcc10f70b5a32b46a6f8af14daf1"`
[INFO] running `"docker" "rm" "-f" "679565ac0d8edd90a36f1218dc0843b92fdbdcc10f70b5a32b46a6f8af14daf1"`
[INFO] [stdout] 679565ac0d8edd90a36f1218dc0843b92fdbdcc10f70b5a32b46a6f8af14daf1
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/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=warn" "-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" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] b2e389685d2a6d123e1df9976024ecf7dc99d07536643e90c8d6c1b1e0632ccc
[INFO] running `"docker" "start" "-a" "b2e389685d2a6d123e1df9976024ecf7dc99d07536643e90c8d6c1b1e0632ccc"`
[INFO] [stderr]    Compiling panic-halt v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0152]: duplicate lang item found: `panic_impl`.
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | / fn panic(_info: &PanicInfo) -> ! {
[INFO] [stderr] 32 | |     loop {
[INFO] [stderr] 33 | |         atomic::compiler_fence(Ordering::SeqCst);
[INFO] [stderr] 34 | |     }
[INFO] [stderr] 35 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: first defined in crate `std`.
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0152`.
[INFO] [stderr] error: Could not compile `panic-halt`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b2e389685d2a6d123e1df9976024ecf7dc99d07536643e90c8d6c1b1e0632ccc"`
[INFO] running `"docker" "rm" "-f" "b2e389685d2a6d123e1df9976024ecf7dc99d07536643e90c8d6c1b1e0632ccc"`
[INFO] [stdout] b2e389685d2a6d123e1df9976024ecf7dc99d07536643e90c8d6c1b1e0632ccc