[INFO] fetching crate panic-rtt-core 0.2.1...
[INFO] testing panic-rtt-core-0.2.1 against 1.54.0 for beta-1.55-1
[INFO] extracting crate panic-rtt-core 0.2.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate panic-rtt-core 0.2.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate panic-rtt-core 0.2.1
[INFO] finished tweaking crates.io crate panic-rtt-core 0.2.1
[INFO] tweaked toml for crates.io crate panic-rtt-core 0.2.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46b31a02a496d8917aad2b1c2005ed260c1f755d512148b9c0353299be32a74a
[INFO] running `Command { std: "docker" "start" "-a" "46b31a02a496d8917aad2b1c2005ed260c1f755d512148b9c0353299be32a74a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46b31a02a496d8917aad2b1c2005ed260c1f755d512148b9c0353299be32a74a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46b31a02a496d8917aad2b1c2005ed260c1f755d512148b9c0353299be32a74a", kill_on_drop: false }`
[INFO] [stdout] 46b31a02a496d8917aad2b1c2005ed260c1f755d512148b9c0353299be32a74a
[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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9c8d6b05184aa997bf7ed23a3ef03988046ba30d2cb60ad4e72a5f8d994eacf4
[INFO] running `Command { std: "docker" "start" "-a" "9c8d6b05184aa997bf7ed23a3ef03988046ba30d2cb60ad4e72a5f8d994eacf4", kill_on_drop: false }`
[INFO] [stderr]    Compiling ufmt-write v0.1.0
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling embedded-hal v0.2.6
[INFO] [stderr]    Compiling cortex-m v0.7.3
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]    Compiling rtt-target v0.2.2
[INFO] [stderr]    Compiling panic-rtt-core v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.05s
[INFO] running `Command { std: "docker" "inspect" "9c8d6b05184aa997bf7ed23a3ef03988046ba30d2cb60ad4e72a5f8d994eacf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c8d6b05184aa997bf7ed23a3ef03988046ba30d2cb60ad4e72a5f8d994eacf4", kill_on_drop: false }`
[INFO] [stdout] 9c8d6b05184aa997bf7ed23a3ef03988046ba30d2cb60ad4e72a5f8d994eacf4
[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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b3b80a2f7cc3c94deb26250ec559f6b09f38ee65c15e9a0c73293f6c7b47dfb1
[INFO] running `Command { std: "docker" "start" "-a" "b3b80a2f7cc3c94deb26250ec559f6b09f38ee65c15e9a0c73293f6c7b47dfb1", kill_on_drop: false }`
[INFO] [stderr]    Compiling panic-rtt-core v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn panic(info: &PanicInfo) -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the lang item is first defined in crate `std` (which `test` depends on)
[INFO] [stdout]    = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/1.54.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-2420485b9e5ef5e1.so, /opt/rustwide/rustup-home/toolchains/1.54.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-2420485b9e5ef5e1.rlib
[INFO] [stdout]    = note: second definition in the local crate (`panic_rtt_core`)
[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 E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `panic-rtt-core`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "b3b80a2f7cc3c94deb26250ec559f6b09f38ee65c15e9a0c73293f6c7b47dfb1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3b80a2f7cc3c94deb26250ec559f6b09f38ee65c15e9a0c73293f6c7b47dfb1", kill_on_drop: false }`
[INFO] [stdout] b3b80a2f7cc3c94deb26250ec559f6b09f38ee65c15e9a0c73293f6c7b47dfb1
