[INFO] fetching crate ferro 0.6.0...
[INFO] checking ferro-0.6.0 against master#30f74ff0dc4d66debc8b50724c446f817e5f75f4 for pr-121848-1
[INFO] extracting crate ferro 0.6.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate ferro 0.6.0 on toolchain 30f74ff0dc4d66debc8b50724c446f817e5f75f4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ferro 0.6.0
[INFO] finished tweaking crates.io crate ferro 0.6.0
[INFO] tweaked toml for crates.io crate ferro 0.6.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate ferro 0.6.0 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" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded blocking v1.3.0
[INFO] [stderr]   Downloaded atomic-waker v1.1.0
[INFO] [stderr]   Downloaded bounded-vec-deque v0.1.1
[INFO] [stderr]   Downloaded lexers v0.1.4
[INFO] [stderr]   Downloaded termbg v0.4.3
[INFO] [stderr]   Downloaded termion v2.0.1
[INFO] [stderr]   Downloaded shunting v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 38e567e00b6c0344a4f025cc6de9e4df0f30a00261da01b6589b670bc6e32eea
[INFO] running `Command { std: "docker" "start" "-a" "38e567e00b6c0344a4f025cc6de9e4df0f30a00261da01b6589b670bc6e32eea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "38e567e00b6c0344a4f025cc6de9e4df0f30a00261da01b6589b670bc6e32eea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38e567e00b6c0344a4f025cc6de9e4df0f30a00261da01b6589b670bc6e32eea", kill_on_drop: false }`
[INFO] [stdout] 38e567e00b6c0344a4f025cc6de9e4df0f30a00261da01b6589b670bc6e32eea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+30f74ff0dc4d66debc8b50724c446f817e5f75f4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5023591b2aeb63666beb7557598cd1b37ea9758561820259c7e8b68a3f48b068
[INFO] running `Command { std: "docker" "start" "-a" "5023591b2aeb63666beb7557598cd1b37ea9758561820259c7e8b68a3f48b068", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling futures-core v0.3.26
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]     Checking futures-io v0.3.26
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling polling v2.5.2
[INFO] [stderr]    Compiling async-io v1.12.0
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]     Checking async-task v4.3.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking atomic-waker v1.1.0
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling thiserror v1.0.38
[INFO] [stderr]    Compiling signal-hook v0.3.15
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.51/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]     Checking async-lock v2.7.0
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking lexers v0.1.4
[INFO] [stderr]     Checking bounded-vec-deque v0.1.1
[INFO] [stderr]     Checking unicode-segmentation v1.10.1
[INFO] [stderr]     Checking futures-lite v1.12.0
[INFO] [stdout] error: aborting due to 1 previous error
[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 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5023591b2aeb63666beb7557598cd1b37ea9758561820259c7e8b68a3f48b068", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5023591b2aeb63666beb7557598cd1b37ea9758561820259c7e8b68a3f48b068", kill_on_drop: false }`
[INFO] [stdout] 5023591b2aeb63666beb7557598cd1b37ea9758561820259c7e8b68a3f48b068
