[INFO] cloning repository https://github.com/AmberThrall/mdbook-environments
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AmberThrall/mdbook-environments" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmberThrall%2Fmdbook-environments", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmberThrall%2Fmdbook-environments'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c3c2b8dcc0856c7a8ceb263f0952bf308e437598
[INFO] checking AmberThrall/mdbook-environments against master#217cb73577ed6f30a2005dd75bab01d23ec4cd60 for pr-148939
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmberThrall%2Fmdbook-environments" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/AmberThrall/mdbook-environments
[INFO] finished tweaking git repo https://github.com/AmberThrall/mdbook-environments
[INFO] tweaked toml for git repo https://github.com/AmberThrall/mdbook-environments written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/AmberThrall/mdbook-environments on toolchain 217cb73577ed6f30a2005dd75bab01d23ec4cd60
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+217cb73577ed6f30a2005dd75bab01d23ec4cd60" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/AmberThrall/mdbook-environments 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" "+217cb73577ed6f30a2005dd75bab01d23ec4cd60" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded topological-sort v0.2.2
[INFO] [stderr]   Downloaded serde v1.0.156
[INFO] [stderr]   Downloaded tokio-tungstenite v0.17.2
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.92
[INFO] [stderr]   Downloaded upon v0.6.0
[INFO] [stderr]   Downloaded terminal_size v0.2.5
[INFO] [stderr]   Downloaded clap_lex v0.3.2
[INFO] [stderr]   Downloaded notify v5.1.0
[INFO] [stderr]   Downloaded pulldown-cmark v0.9.2
[INFO] [stderr]   Downloaded ammonia v3.3.0
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.92
[INFO] [stderr]   Downloaded io-lifetimes v1.0.7
[INFO] [stderr]   Downloaded elasticlunr-rs v3.0.1
[INFO] [stderr]   Downloaded warp v0.3.3
[INFO] [stderr]   Downloaded clap_complete v4.1.4
[INFO] [stderr]   Downloaded kqueue v1.0.7
[INFO] [stderr]   Downloaded gitignore v1.0.7
[INFO] [stderr]   Downloaded kqueue-sys v1.0.3
[INFO] [stderr]   Downloaded notify-debouncer-mini v0.2.1
[INFO] [stderr]   Downloaded opener v0.5.2
[INFO] [stderr]   Downloaded is-terminal v0.4.4
[INFO] [stderr]   Downloaded cxx-build v1.0.92
[INFO] [stderr]   Downloaded cxx v1.0.92
[INFO] [stderr]   Downloaded clap v4.1.8
[INFO] [stderr]   Downloaded serde_derive v1.0.156
[INFO] [stderr]   Downloaded rustls-pemfile v0.2.1
[INFO] [stderr]   Downloaded bstr v1.3.0
[INFO] [stderr]   Downloaded mdbook v0.4.28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+217cb73577ed6f30a2005dd75bab01d23ec4cd60" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9c2ec0a187ce1b36774bff981ad0649ce15d13015eaf74f2fd238f08ac31fb95
[INFO] running `Command { std: "docker" "start" "-a" "9c2ec0a187ce1b36774bff981ad0649ce15d13015eaf74f2fd238f08ac31fb95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c2ec0a187ce1b36774bff981ad0649ce15d13015eaf74f2fd238f08ac31fb95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c2ec0a187ce1b36774bff981ad0649ce15d13015eaf74f2fd238f08ac31fb95", kill_on_drop: false }`
[INFO] [stdout] 9c2ec0a187ce1b36774bff981ad0649ce15d13015eaf74f2fd238f08ac31fb95
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+217cb73577ed6f30a2005dd75bab01d23ec4cd60" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 575593267a5e1915c1667444832e9ebd978919791a053af2915fbcbcac65d813
[INFO] running `Command { std: "docker" "start" "-a" "575593267a5e1915c1667444832e9ebd978919791a053af2915fbcbcac65d813", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.52
[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 libc v0.2.140
[INFO] [stderr]     Checking once_cell v1.17.1
[INFO] [stderr]    Compiling serde_derive v1.0.156
[INFO] [stderr]    Compiling serde v1.0.156
[INFO] [stderr]    Compiling thiserror v1.0.39
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling futures-core v0.3.27
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling siphasher v0.3.10
[INFO] [stderr]    Compiling io-lifetimes v1.0.7
[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] [stderr]    Compiling phf_shared v0.10.0
[INFO] [stderr]     Checking http v0.2.9
[INFO] [stderr]    Compiling unicase v2.6.0
[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" "575593267a5e1915c1667444832e9ebd978919791a053af2915fbcbcac65d813", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "575593267a5e1915c1667444832e9ebd978919791a053af2915fbcbcac65d813", kill_on_drop: false }`
[INFO] [stdout] 575593267a5e1915c1667444832e9ebd978919791a053af2915fbcbcac65d813
