[INFO] cloning repository https://github.com/georgerock/microbit-rust-starter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/georgerock/microbit-rust-starter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgeorgerock%2Fmicrobit-rust-starter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgeorgerock%2Fmicrobit-rust-starter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b88f59d2d45c3c0c06b3222c81eac265e5d40d41
[INFO] checking georgerock/microbit-rust-starter/b88f59d2d45c3c0c06b3222c81eac265e5d40d41 against master#ff1737bb00913444173658b4e0b274fd79aabf66 for pr-132712-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgeorgerock%2Fmicrobit-rust-starter" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/georgerock/microbit-rust-starter on toolchain ff1737bb00913444173658b4e0b274fd79aabf66
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-7-tc1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/georgerock/microbit-rust-starter
[INFO] finished tweaking git repo https://github.com/georgerock/microbit-rust-starter
[INFO] tweaked toml for git repo https://github.com/georgerock/microbit-rust-starter written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/georgerock/microbit-rust-starter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ufmt-write v0.1.0
[INFO] [stderr]   Downloaded rtt-target v0.3.1
[INFO] [stderr]   Downloaded panic-rtt-target v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12ba0f060b222c2a926ebff57c20da8cb737b9128d8bccdfed2edbe4f62741e7
[INFO] running `Command { std: "docker" "start" "-a" "12ba0f060b222c2a926ebff57c20da8cb737b9128d8bccdfed2edbe4f62741e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12ba0f060b222c2a926ebff57c20da8cb737b9128d8bccdfed2edbe4f62741e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12ba0f060b222c2a926ebff57c20da8cb737b9128d8bccdfed2edbe4f62741e7", kill_on_drop: false }`
[INFO] [stdout] 12ba0f060b222c2a926ebff57c20da8cb737b9128d8bccdfed2edbe4f62741e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+ff1737bb00913444173658b4e0b274fd79aabf66" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dfc3dd01ba79af2fd3554c36c9e5cf2d2e5ae4af1a22d4dc73c9ae9d3574a9bf
[INFO] running `Command { std: "docker" "start" "-a" "dfc3dd01ba79af2fd3554c36c9e5cf2d2e5ae4af1a22d4dc73c9ae9d3574a9bf", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling cortex-m v0.7.7
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]     Checking ufmt-write v0.1.0
[INFO] [stderr]    Compiling cortex-m-rt v0.7.3
[INFO] [stderr]     Checking volatile-register v0.2.2
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking rtt-target v0.3.1
[INFO] [stderr]     Checking panic-rtt-target v0.1.2
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.7.0
[INFO] [stderr]     Checking rtt-check v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0152]: duplicate lang item in crate `std` (which `test` depends on): `panic_impl`
[INFO] [stdout]   |
[INFO] [stdout]   = note: the lang item is first defined in crate `panic_rtt_target` (which `rtt_check` depends on)
[INFO] [stdout]   = note: first definition in `panic_rtt_target` loaded from /opt/rustwide/target/debug/deps/libpanic_rtt_target-05084adf51ab1de2.rmeta
[INFO] [stdout]   = note: second definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/ff1737bb00913444173658b4e0b274fd79aabf66/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-cb5ec2ef594bb30c.rlib
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rtt-check` (bin "rtt-check") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `rtt-check` (bin "rtt-check" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "dfc3dd01ba79af2fd3554c36c9e5cf2d2e5ae4af1a22d4dc73c9ae9d3574a9bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfc3dd01ba79af2fd3554c36c9e5cf2d2e5ae4af1a22d4dc73c9ae9d3574a9bf", kill_on_drop: false }`
[INFO] [stdout] dfc3dd01ba79af2fd3554c36c9e5cf2d2e5ae4af1a22d4dc73c9ae9d3574a9bf