[INFO] crate panic_rtt 0.2.0 is already in cache
[INFO] extracting crate panic_rtt 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/panic_rtt/0.2.0
[INFO] extracting crate panic_rtt 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/panic_rtt/0.2.0
[INFO] validating manifest of panic_rtt-0.2.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of panic_rtt-0.2.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing panic_rtt-0.2.0
[INFO] finished frobbing panic_rtt-0.2.0
[INFO] frobbed toml for panic_rtt-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/panic_rtt/0.2.0/Cargo.toml
[INFO] started frobbing panic_rtt-0.2.0
[INFO] finished frobbing panic_rtt-0.2.0
[INFO] frobbed toml for panic_rtt-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/panic_rtt/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing panic_rtt-0.2.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/panic_rtt/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f7674708d84668d9537bf90cf5033d5003f5d18d2a5612f8188b58e6e16fceb7
[INFO] running `"docker" "start" "-a" "f7674708d84668d9537bf90cf5033d5003f5d18d2a5612f8188b58e6e16fceb7"`
[INFO] [stderr]    Compiling jlink_rtt v0.1.0
[INFO] [stderr]    Compiling panic_rtt v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `"docker" "inspect" "f7674708d84668d9537bf90cf5033d5003f5d18d2a5612f8188b58e6e16fceb7"`
[INFO] running `"docker" "rm" "-f" "f7674708d84668d9537bf90cf5033d5003f5d18d2a5612f8188b58e6e16fceb7"`
[INFO] [stdout] f7674708d84668d9537bf90cf5033d5003f5d18d2a5612f8188b58e6e16fceb7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/panic_rtt/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 151ccc168b1c5ac706d2b03caf0c71a237282fba4b3a4afbe2c8176f117883d7
[INFO] running `"docker" "start" "-a" "151ccc168b1c5ac706d2b03caf0c71a237282fba4b3a4afbe2c8176f117883d7"`
[INFO] [stderr]    Compiling panic_rtt v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0152]: duplicate lang item found: `panic_impl`.
[INFO] [stderr]   --> src/lib.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | / fn panic(info: &PanicInfo) -> ! {
[INFO] [stderr] 33 | |     interrupt::disable();
[INFO] [stderr] 34 | |
[INFO] [stderr] 35 | |     let mut out = jlink_rtt::Output::new();
[INFO] [stderr] ...  |
[INFO] [stderr] 40 | |     }
[INFO] [stderr] 41 | | }
[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_rtt`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "151ccc168b1c5ac706d2b03caf0c71a237282fba4b3a4afbe2c8176f117883d7"`
[INFO] running `"docker" "rm" "-f" "151ccc168b1c5ac706d2b03caf0c71a237282fba4b3a4afbe2c8176f117883d7"`
[INFO] [stdout] 151ccc168b1c5ac706d2b03caf0c71a237282fba4b3a4afbe2c8176f117883d7