[INFO] fetching crate rss4mdbook 0.2.42...
[INFO] testing rss4mdbook-0.2.42 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate rss4mdbook 0.2.42 into /workspace/builds/worker-4-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-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rss4mdbook 0.2.42 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded diligent-date-parser v0.1.4
[INFO] [stderr]   Downloaded never v0.1.0
[INFO] [stderr]   Downloaded clia-local-offset v0.1.0
[INFO] [stderr]   Downloaded clia-tracing-config v0.2.5
[INFO] [stderr]   Downloaded thiserror-impl v1.0.39
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.92
[INFO] [stderr]   Downloaded atom_syndication v0.12.0
[INFO] [stderr]   Downloaded rss v2.0.2
[INFO] [stderr]   Downloaded tz-rs v0.6.14
[INFO] [stderr]   Downloaded toml v0.7.2
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.92
[INFO] [stderr]   Downloaded cxx-build v1.0.92
[INFO] [stderr]   Downloaded thiserror v1.0.39
[INFO] [stderr]   Downloaded winnow v0.3.5
[INFO] [stderr]   Downloaded clia-tracing-appender v0.2.5
[INFO] [stderr]   Downloaded cxx v1.0.92
[INFO] [stderr]   Downloaded quick-xml v0.27.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d44c69317c5035a70f52eab1509c8b9da7462f6e390dd48b5e7134c52f0e32c0
[INFO] running `Command { std: "docker" "start" "-a" "d44c69317c5035a70f52eab1509c8b9da7462f6e390dd48b5e7134c52f0e32c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d44c69317c5035a70f52eab1509c8b9da7462f6e390dd48b5e7134c52f0e32c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d44c69317c5035a70f52eab1509c8b9da7462f6e390dd48b5e7134c52f0e32c0", kill_on_drop: false }`
[INFO] [stdout] d44c69317c5035a70f52eab1509c8b9da7462f6e390dd48b5e7134c52f0e32c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1a1fd09ffc45bc7531fdba7b20696f2ea4c29f8fa9517051962cd824e7c2cd46
[INFO] running `Command { std: "docker" "start" "-a" "1a1fd09ffc45bc7531fdba7b20696f2ea4c29f8fa9517051962cd824e7c2cd46", 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 once_cell v1.17.1
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling const_fn v0.4.9
[INFO] [stderr]    Compiling itoa v1.0.6
[INFO] [stderr]    Compiling tracing-core v0.1.30
[INFO] [stderr]    Compiling time-macros v0.2.8
[INFO] [stderr]    Compiling num_threads v0.1.6
[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 crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling serde_json v1.0.94
[INFO] [stderr]    Compiling io-lifetimes v1.0.6
[INFO] [stderr]    Compiling regex-automata v0.1.10
[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" "1a1fd09ffc45bc7531fdba7b20696f2ea4c29f8fa9517051962cd824e7c2cd46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a1fd09ffc45bc7531fdba7b20696f2ea4c29f8fa9517051962cd824e7c2cd46", kill_on_drop: false }`
[INFO] [stdout] 1a1fd09ffc45bc7531fdba7b20696f2ea4c29f8fa9517051962cd824e7c2cd46