[INFO] cloning repository https://github.com/mod7ex/rust-blockchain-toy
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mod7ex/rust-blockchain-toy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmod7ex%2Frust-blockchain-toy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmod7ex%2Frust-blockchain-toy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7acc306a04b9ebf1d7d23ea89896615f9ec32241
[INFO] checking mod7ex/rust-blockchain-toy against master#ed141926048597e3649bb238ca3dc417904cd56c for pr-134300
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmod7ex%2Frust-blockchain-toy" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mod7ex/rust-blockchain-toy on toolchain ed141926048597e3649bb238ca3dc417904cd56c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ed141926048597e3649bb238ca3dc417904cd56c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mod7ex/rust-blockchain-toy
[INFO] finished tweaking git repo https://github.com/mod7ex/rust-blockchain-toy
[INFO] tweaked toml for git repo https://github.com/mod7ex/rust-blockchain-toy written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mod7ex/rust-blockchain-toy 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" "+ed141926048597e3649bb238ca3dc417904cd56c" "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-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ed141926048597e3649bb238ca3dc417904cd56c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 60963f3b76d561e6a2a4d525a4c9319ca6e6475b2080e06cec41042598872f5b
[INFO] running `Command { std: "docker" "start" "-a" "60963f3b76d561e6a2a4d525a4c9319ca6e6475b2080e06cec41042598872f5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "60963f3b76d561e6a2a4d525a4c9319ca6e6475b2080e06cec41042598872f5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "60963f3b76d561e6a2a4d525a4c9319ca6e6475b2080e06cec41042598872f5b", kill_on_drop: false }`
[INFO] [stdout] 60963f3b76d561e6a2a4d525a4c9319ca6e6475b2080e06cec41042598872f5b
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ed141926048597e3649bb238ca3dc417904cd56c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb6d69d19f9c82b6fbfe0c3d81abbb54517b72eecb9f9f822b8646814e554c12
[INFO] running `Command { std: "docker" "start" "-a" "bb6d69d19f9c82b6fbfe0c3d81abbb54517b72eecb9f9f822b8646814e554c12", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling serde_json v1.0.91
[INFO] [stderr]     Checking ryu v1.0.12
[INFO] [stderr]     Checking iana-time-zone v0.1.53
[INFO] [stderr]     Checking itoa v1.0.5
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking cpufeatures v0.2.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.49/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 generic-array v0.14.6
[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" "bb6d69d19f9c82b6fbfe0c3d81abbb54517b72eecb9f9f822b8646814e554c12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb6d69d19f9c82b6fbfe0c3d81abbb54517b72eecb9f9f822b8646814e554c12", kill_on_drop: false }`
[INFO] [stdout] bb6d69d19f9c82b6fbfe0c3d81abbb54517b72eecb9f9f822b8646814e554c12