[INFO] fetching crate microbit-v2 0.13.0...
[INFO] checking microbit-v2-0.13.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate microbit-v2 0.13.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate microbit-v2 0.13.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate microbit-v2 0.13.0
[INFO] finished tweaking crates.io crate microbit-v2 0.13.0
[INFO] tweaked toml for crates.io crate microbit-v2 0.13.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 41 packages
[INFO] [stderr]       Adding bare-metal v0.2.5 (latest: v1.0.0)
[INFO] [stderr]       Adding bitfield v0.13.2 (latest: v0.14.0)
[INFO] [stderr]       Adding critical-section v0.2.8 (latest: v1.1.2)
[INFO] [stderr]       Adding embedded-dma v0.1.2 (latest: v0.2.0)
[INFO] [stderr]       Adding embedded-hal v0.2.7 (latest: v1.0.0)
[INFO] [stderr]       Adding embedded-storage v0.2.0 (latest: v0.3.1)
[INFO] [stderr]       Adding nb v0.1.3 (latest: v1.1.0)
[INFO] [stderr]       Adding nrf-hal-common v0.14.1 (latest: v0.16.1)
[INFO] [stderr]       Adding nrf-usbd v0.1.1 (latest: v0.2.0)
[INFO] [stderr]       Adding nrf52833-hal v0.14.1 (latest: v0.16.1)
[INFO] [stderr]       Adding nrf52833-pac v0.10.1 (latest: v0.12.2)
[INFO] [stderr]       Adding rustc_version v0.2.3 (latest: v0.4.0)
[INFO] [stderr]       Adding semver v0.9.0 (latest: v1.0.22)
[INFO] [stderr]       Adding semver-parser v0.7.0 (latest: v0.10.2)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding usb-device v0.2.9 (latest: v0.3.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded microbit-common v0.13.0
[INFO] [stderr]   Downloaded tiny-led-matrix v1.0.2
[INFO] [stderr]   Downloaded nrf-hal-common v0.14.1
[INFO] [stderr]   Downloaded nrf52833-hal v0.14.1
[INFO] [stderr]   Downloaded embedded-dma v0.1.2
[INFO] [stderr]   Downloaded fixed v1.27.0
[INFO] [stderr]   Downloaded embedded-storage v0.2.0
[INFO] [stderr]   Downloaded nrf52833-pac v0.10.1
[INFO] [stderr]   Downloaded critical-section v0.2.8
[INFO] [stderr]   Downloaded usb-device v0.2.9
[INFO] [stderr]   Downloaded nrf-usbd v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be41ab8a917f9a6435b8a04cb633efff51b0d1897b3f4a4dabf97ccfba64e9a6
[INFO] running `Command { std: "docker" "start" "-a" "be41ab8a917f9a6435b8a04cb633efff51b0d1897b3f4a4dabf97ccfba64e9a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be41ab8a917f9a6435b8a04cb633efff51b0d1897b3f4a4dabf97ccfba64e9a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be41ab8a917f9a6435b8a04cb633efff51b0d1897b3f4a4dabf97ccfba64e9a6", kill_on_drop: false }`
[INFO] [stdout] be41ab8a917f9a6435b8a04cb633efff51b0d1897b3f4a4dabf97ccfba64e9a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 970bc9fcff629589f28b05768b3eaf64b69687a02402259b9b0b0813dc87a695
[INFO] running `Command { std: "docker" "start" "-a" "970bc9fcff629589f28b05768b3eaf64b69687a02402259b9b0b0813dc87a695", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.7.7
[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-rt v0.7.3
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]    Compiling az v1.2.1
[INFO] [stderr]     Checking critical-section v1.1.2
[INFO] [stderr]    Compiling nrf52833-pac v0.10.1
[INFO] [stderr]     Checking bare-metal v1.0.0
[INFO] [stderr]    Compiling fixed v1.27.0
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking usb-device v0.2.9
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling nrf-hal-common v0.14.1
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.7.0
[INFO] [stderr]     Checking volatile-register v0.2.2
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-storage v0.2.0
[INFO] [stderr]     Checking embedded-dma v0.1.2
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking critical-section v0.2.8
[INFO] [stderr]    Compiling nrf52833-hal v0.14.1
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking tiny-led-matrix v1.0.2
[INFO] [stderr]     Checking nrf-usbd v0.1.1
[INFO] [stderr]     Checking microbit-common v0.13.0
[INFO] [stderr]     Checking microbit-v2 v0.13.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 27.08s
[INFO] running `Command { std: "docker" "inspect" "970bc9fcff629589f28b05768b3eaf64b69687a02402259b9b0b0813dc87a695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "970bc9fcff629589f28b05768b3eaf64b69687a02402259b9b0b0813dc87a695", kill_on_drop: false }`
[INFO] [stdout] 970bc9fcff629589f28b05768b3eaf64b69687a02402259b9b0b0813dc87a695