[INFO] cloning repository https://github.com/DukeTresnor/micro_bit_serial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DukeTresnor/micro_bit_serial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDukeTresnor%2Fmicro_bit_serial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDukeTresnor%2Fmicro_bit_serial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8bba4c87b76dee2f12348abf1704f86c05c30b4
[INFO] checking DukeTresnor/micro_bit_serial against try#a3dffdb3a32d0dedc198f9de7d43173f3eb6727b for pr-136303
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDukeTresnor%2Fmicro_bit_serial" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/DukeTresnor/micro_bit_serial on toolchain a3dffdb3a32d0dedc198f9de7d43173f3eb6727b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3-tc2/source/.cargo/config
[INFO] started tweaking git repo https://github.com/DukeTresnor/micro_bit_serial
[INFO] finished tweaking git repo https://github.com/DukeTresnor/micro_bit_serial
[INFO] tweaked toml for git repo https://github.com/DukeTresnor/micro_bit_serial written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/DukeTresnor/micro_bit_serial 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" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fb6f213a32eeec2c76f44f9bb08504c6fc5afc0dfd38c16892a7771aa25db75c
[INFO] running `Command { std: "docker" "start" "-a" "fb6f213a32eeec2c76f44f9bb08504c6fc5afc0dfd38c16892a7771aa25db75c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb6f213a32eeec2c76f44f9bb08504c6fc5afc0dfd38c16892a7771aa25db75c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb6f213a32eeec2c76f44f9bb08504c6fc5afc0dfd38c16892a7771aa25db75c", kill_on_drop: false }`
[INFO] [stdout] fb6f213a32eeec2c76f44f9bb08504c6fc5afc0dfd38c16892a7771aa25db75c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a3dffdb3a32d0dedc198f9de7d43173f3eb6727b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aeeec185f29ac70a047e4a295d39e616ffcbca7b8e37955e47393d32af36cee8
[INFO] running `Command { std: "docker" "start" "-a" "aeeec185f29ac70a047e4a295d39e616ffcbca7b8e37955e47393d32af36cee8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]    Compiling thiserror v1.0.40
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]    Compiling defmt v0.3.4
[INFO] [stderr]    Compiling defmt-macros v0.3.4
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking critical-section v1.1.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling cortex-m v0.7.7
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking ufmt-write v0.1.0
[INFO] [stderr]     Checking volatile-register v0.2.1
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]    Compiling cortex-m-rt v0.7.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling defmt-rtt v0.4.0
[INFO] [stderr]     Checking rtt-target v0.3.1
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking rtt-target v0.4.0
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]     Checking lsm303agr v0.2.2
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.56/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] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking panic-rtt-target v0.1.2
[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" "aeeec185f29ac70a047e4a295d39e616ffcbca7b8e37955e47393d32af36cee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aeeec185f29ac70a047e4a295d39e616ffcbca7b8e37955e47393d32af36cee8", kill_on_drop: false }`
[INFO] [stdout] aeeec185f29ac70a047e4a295d39e616ffcbca7b8e37955e47393d32af36cee8
