[INFO] cloning repository https://github.com/unfunco/microbit-experiments
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/unfunco/microbit-experiments" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funfunco%2Fmicrobit-experiments", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funfunco%2Fmicrobit-experiments'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 55619cf41e8e41aca08c3ce4f4b8e32305a23aba
[INFO] checking unfunco/microbit-experiments against try#0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9 for pr-147185
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funfunco%2Fmicrobit-experiments" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-1-tc2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/unfunco/microbit-experiments
[INFO] finished tweaking git repo https://github.com/unfunco/microbit-experiments
[INFO] tweaked toml for git repo https://github.com/unfunco/microbit-experiments written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/unfunco/microbit-experiments on toolchain 0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/unfunco/microbit-experiments 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" "+0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9" "fetch" "--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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tiny-led-matrix v1.0.2
[INFO] [stderr]   Downloaded microbit-common v0.13.0
[INFO] [stderr]   Downloaded microbit-v2 v0.13.0
[INFO] [stderr]   Downloaded critical-section v0.2.8
[INFO] [stderr]   Downloaded nrf52833-hal v0.14.1
[INFO] [stderr]   Downloaded usb-device v0.2.9
[INFO] [stderr]   Downloaded embedded-dma v0.1.2
[INFO] [stderr]   Downloaded nrf-usbd v0.1.1
[INFO] [stderr]   Downloaded nrf-hal-common v0.14.1
[INFO] [stderr]   Downloaded embedded-storage v0.2.0
[INFO] [stderr]   Downloaded nrf52833-pac v0.10.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 64b00aed456b2fd3526bdfa2e7f058a32d0f9b6963cc8e670eeb7ad9ad9c7e6b
[INFO] running `Command { std: "docker" "start" "-a" "64b00aed456b2fd3526bdfa2e7f058a32d0f9b6963cc8e670eeb7ad9ad9c7e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "64b00aed456b2fd3526bdfa2e7f058a32d0f9b6963cc8e670eeb7ad9ad9c7e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64b00aed456b2fd3526bdfa2e7f058a32d0f9b6963cc8e670eeb7ad9ad9c7e6b", kill_on_drop: false }`
[INFO] [stdout] 64b00aed456b2fd3526bdfa2e7f058a32d0f9b6963cc8e670eeb7ad9ad9c7e6b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+0de49ae9e81f9a1e7df6f0783824ce94ed18e8a9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 536d5b427cee37dfc1fad3c524fdd2e06899c40f55640b490a3c800c43a38335
[INFO] running `Command { std: "docker" "start" "-a" "536d5b427cee37dfc1fad3c524fdd2e06899c40f55640b490a3c800c43a38335", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.52
[INFO] [stderr]    Compiling cortex-m v0.7.7
[INFO] [stderr]     Checking critical-section v1.1.1
[INFO] [stderr]    Compiling fixed v1.23.1
[INFO] [stderr]     Checking volatile-register v0.2.1
[INFO] [stderr]     Checking bare-metal v1.0.0
[INFO] [stderr]    Compiling nrf52833-pac v0.10.1
[INFO] [stderr]     Checking bytemuck v1.13.1
[INFO] [stderr]     Checking az v1.2.1
[INFO] [stderr]    Compiling nrf-hal-common v0.14.1
[INFO] [stderr]     Checking half v2.2.1
[INFO] [stderr]     Checking usb-device v0.2.9
[INFO] [stderr]     Checking embedded-dma v0.1.2
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling defmt-macros v0.3.3
[INFO] [stderr]     Checking embedded-storage v0.2.0
[INFO] [stderr]    Compiling nrf52833-hal v0.14.1
[INFO] [stderr]    Compiling defmt v0.3.2
[INFO] [stderr]    Compiling defmt-parser v0.3.1
[INFO] [stderr]    Compiling defmt-rtt v0.4.0
[INFO] [stderr]     Checking critical-section v0.2.8
[INFO] [stderr]     Checking tiny-led-matrix v1.0.2
[INFO] [stderr]     Checking panic-halt v0.2.0
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.52/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "536d5b427cee37dfc1fad3c524fdd2e06899c40f55640b490a3c800c43a38335", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "536d5b427cee37dfc1fad3c524fdd2e06899c40f55640b490a3c800c43a38335", kill_on_drop: false }`
[INFO] [stdout] 536d5b427cee37dfc1fad3c524fdd2e06899c40f55640b490a3c800c43a38335