[INFO] fetching crate rss4mdbook 0.2.42...
[INFO] building rss4mdbook-0.2.42 against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237-1
[INFO] extracting crate rss4mdbook 0.2.42 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate rss4mdbook 0.2.42
[INFO] finished tweaking crates.io crate rss4mdbook 0.2.42
[INFO] tweaked toml for crates.io crate rss4mdbook 0.2.42 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rss4mdbook 0.2.42 on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rss4mdbook 0.2.42 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" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded darling v0.14.3
[INFO] [stderr]   Downloaded rss v2.0.2
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.92
[INFO] [stderr]   Downloaded toml v0.7.2
[INFO] [stderr]   Downloaded darling_core v0.14.3
[INFO] [stderr]   Downloaded clap_lex v0.3.2
[INFO] [stderr]   Downloaded is-terminal v0.4.4
[INFO] [stderr]   Downloaded darling_macro v0.14.3
[INFO] [stderr]   Downloaded diligent-date-parser v0.1.4
[INFO] [stderr]   Downloaded winnow v0.3.5
[INFO] [stderr]   Downloaded io-lifetimes v1.0.6
[INFO] [stderr]   Downloaded serde_json v1.0.94
[INFO] [stderr]   Downloaded const_fn v0.4.9
[INFO] [stderr]   Downloaded toml_edit v0.19.4
[INFO] [stderr]   Downloaded clap_derive v4.1.8
[INFO] [stderr]   Downloaded clap v4.1.8
[INFO] [stderr]   Downloaded clia-tracing-appender v0.2.5
[INFO] [stderr]   Downloaded cxx v1.0.92
[INFO] [stderr]   Downloaded clia-tracing-config v0.2.5
[INFO] [stderr]   Downloaded quick-xml v0.27.1
[INFO] [stderr]   Downloaded time-macros v0.2.8
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.92
[INFO] [stderr]   Downloaded rustix v0.36.9
[INFO] [stderr]   Downloaded cxx-build v1.0.92
[INFO] [stderr]   Downloaded crossbeam-channel v0.5.7
[INFO] [stderr]   Downloaded atom_syndication v0.12.0
[INFO] [stderr]   Downloaded tz-rs v0.6.14
[INFO] [stderr]   Downloaded thiserror-impl v1.0.39
[INFO] [stderr]   Downloaded thiserror v1.0.39
[INFO] [stderr]   Downloaded clia-local-offset v0.1.0
[INFO] [stderr]   Downloaded never v0.1.0
[INFO] [stderr]   Downloaded serde_spanned v0.6.1
[INFO] [stderr]   Downloaded toml_datetime v0.6.1
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9437e7f009ceb0fe98ad078e603135e66739195c57adf06df7b072cd243e7515
[INFO] running `Command { std: "docker" "start" "-a" "9437e7f009ceb0fe98ad078e603135e66739195c57adf06df7b072cd243e7515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9437e7f009ceb0fe98ad078e603135e66739195c57adf06df7b072cd243e7515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9437e7f009ceb0fe98ad078e603135e66739195c57adf06df7b072cd243e7515", kill_on_drop: false }`
[INFO] [stdout] 9437e7f009ceb0fe98ad078e603135e66739195c57adf06df7b072cd243e7515
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b9737f650d5b8c49a04bb6f5cae92c69fe1ec27ef05a7d55d11c04154b688b6
[INFO] running `Command { std: "docker" "start" "-a" "3b9737f650d5b8c49a04bb6f5cae92c69fe1ec27ef05a7d55d11c04154b688b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling const_fn v0.4.9
[INFO] [stderr]    Compiling time-core v0.1.0
[INFO] [stderr]    Compiling tracing-core v0.1.30
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling serde_json v1.0.94
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling io-lifetimes v1.0.6
[INFO] [stderr]    Compiling num_threads v0.1.6
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling thiserror v1.0.39
[INFO] [stderr]    Compiling time-macros v0.2.8
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling iana-time-zone v0.1.53
[INFO] [stderr]    Compiling rustix v0.36.9
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.51/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]    Compiling tracing-log v0.1.3
[INFO] [stderr]    Compiling sharded-slab v0.1.4
[INFO] [stderr]    Compiling thread_local v1.1.7
[INFO] [stderr]    Compiling encoding_rs v0.8.32
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling linux-raw-sys v0.1.4
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling crossbeam-channel v0.5.7
[INFO] [stderr]    Compiling never v0.1.0
[INFO] [stderr]    Compiling symlink v0.1.0
[INFO] [stderr]    Compiling os_str_bytes v6.4.1
[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" "3b9737f650d5b8c49a04bb6f5cae92c69fe1ec27ef05a7d55d11c04154b688b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b9737f650d5b8c49a04bb6f5cae92c69fe1ec27ef05a7d55d11c04154b688b6", kill_on_drop: false }`
[INFO] [stdout] 3b9737f650d5b8c49a04bb6f5cae92c69fe1ec27ef05a7d55d11c04154b688b6