[INFO] cloning repository https://github.com/pulsar-edit/core-languages
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pulsar-edit/core-languages" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpulsar-edit%2Fcore-languages", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpulsar-edit%2Fcore-languages'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c504b45de94ca5c39688f6c2af0ce09289179c4
[INFO] documenting pulsar-edit/core-languages/5c504b45de94ca5c39688f6c2af0ce09289179c4 against master#d7d9f15be205b45d44700e7ac33b4f79b91f9680 for pr-117450
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpulsar-edit%2Fcore-languages" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pulsar-edit/core-languages on toolchain d7d9f15be205b45d44700e7ac33b4f79b91f9680
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d7d9f15be205b45d44700e7ac33b4f79b91f9680" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pulsar-edit/core-languages
[INFO] finished tweaking git repo https://github.com/pulsar-edit/core-languages
[INFO] tweaked toml for git repo https://github.com/pulsar-edit/core-languages written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/pulsar-edit/core-languages 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" "+d7d9f15be205b45d44700e7ac33b4f79b91f9680" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded neon-macros v0.10.1
[INFO] [stderr]   Downloaded neon-build v0.10.1
[INFO] [stderr]   Downloaded syn-mid v0.5.3
[INFO] [stderr]   Downloaded neon-runtime v0.10.1
[INFO] [stderr]   Downloaded neon v0.10.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+d7d9f15be205b45d44700e7ac33b4f79b91f9680" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 220509bf306a4f529ec642b20a97c0eb6eaf4d9aab7de2bab0fb87649222425f
[INFO] running `Command { std: "docker" "start" "-a" "220509bf306a4f529ec642b20a97c0eb6eaf4d9aab7de2bab0fb87649222425f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "220509bf306a4f529ec642b20a97c0eb6eaf4d9aab7de2bab0fb87649222425f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "220509bf306a4f529ec642b20a97c0eb6eaf4d9aab7de2bab0fb87649222425f", kill_on_drop: false }`
[INFO] [stdout] 220509bf306a4f529ec642b20a97c0eb6eaf4d9aab7de2bab0fb87649222425f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+d7d9f15be205b45d44700e7ac33b4f79b91f9680" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 63eac65fcdf2b0b79b5658fbc1f0c72737d2ee046b8a500f3f1a69bf35c5ec5c
[INFO] running `Command { std: "docker" "start" "-a" "63eac65fcdf2b0b79b5658fbc1f0c72737d2ee046b8a500f3f1a69bf35c5ec5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling unicode-ident v1.0.5
[INFO] [stderr]    Compiling syn v1.0.102
[INFO] [stderr]    Compiling neon-build v0.10.1
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking libloading v0.6.7
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking neon-runtime v0.10.1
[INFO] [stderr]    Compiling neon v0.10.1
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.46/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] error: aborting due to 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] running `Command { std: "docker" "inspect" "63eac65fcdf2b0b79b5658fbc1f0c72737d2ee046b8a500f3f1a69bf35c5ec5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63eac65fcdf2b0b79b5658fbc1f0c72737d2ee046b8a500f3f1a69bf35c5ec5c", kill_on_drop: false }`
[INFO] [stdout] 63eac65fcdf2b0b79b5658fbc1f0c72737d2ee046b8a500f3f1a69bf35c5ec5c