[INFO] fetching crate mdbook-external-links 0.1.2...
[INFO] testing mdbook-external-links-0.1.2 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] extracting crate mdbook-external-links 0.1.2 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate mdbook-external-links 0.1.2
[INFO] finished tweaking crates.io crate mdbook-external-links 0.1.2
[INFO] tweaked toml for crates.io crate mdbook-external-links 0.1.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mdbook-external-links 0.1.2 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mdbook-external-links 0.1.2 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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] [stderr]   Downloaded mdbook v0.4.25
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6cc81ee16bb7a488cfff9079ec16a5ad3f228405c4effa96b70d2a6d44999185
[INFO] running `Command { std: "docker" "start" "-a" "6cc81ee16bb7a488cfff9079ec16a5ad3f228405c4effa96b70d2a6d44999185", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6cc81ee16bb7a488cfff9079ec16a5ad3f228405c4effa96b70d2a6d44999185", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cc81ee16bb7a488cfff9079ec16a5ad3f228405c4effa96b70d2a6d44999185", kill_on_drop: false }`
[INFO] [stdout] 6cc81ee16bb7a488cfff9079ec16a5ad3f228405c4effa96b70d2a6d44999185
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d3ef32893fcf4936af25ef3a9b7bf0d0db76c443a3b0c5a1839f099d239a81d
[INFO] running `Command { std: "docker" "start" "-a" "3d3ef32893fcf4936af25ef3a9b7bf0d0db76c443a3b0c5a1839f099d239a81d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.50
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling once_cell v1.17.0
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling itoa v1.0.5
[INFO] [stderr]    Compiling typenum v1.16.0
[INFO] [stderr]    Compiling bytes v1.3.0
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling generic-array v0.14.6
[INFO] [stderr]    Compiling siphasher v0.3.10
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling thiserror v1.0.38
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling phf_shared v0.10.0
[INFO] [stderr]    Compiling tokio v1.24.2
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling io-lifetimes v1.0.4
[INFO] [stderr]    Compiling tinyvec v1.6.0
[INFO] [stderr]    Compiling slab v0.4.7
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling futures-sink v0.3.25
[INFO] [stderr]    Compiling rustix v0.36.6
[INFO] [stderr]    Compiling futures-task v0.3.25
[INFO] [stderr]    Compiling percent-encoding v2.2.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.6
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling cpufeatures v0.2.5
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling http v0.2.8
[INFO] [stderr]    Compiling form_urlencoded v1.1.0
[INFO] [stderr]    Compiling futures-util v0.3.25
[INFO] [stderr]    Compiling linux-raw-sys v0.1.4
[INFO] [stderr]    Compiling unicode-bidi v0.3.8
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.50/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-core v0.1.30
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.14
[INFO] [stderr]    Compiling ryu v1.0.12
[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling serde_json v1.0.91
[INFO] [stderr]    Compiling mac v0.1.1
[INFO] [stderr]    Compiling ucd-trie v0.1.5
[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" "3d3ef32893fcf4936af25ef3a9b7bf0d0db76c443a3b0c5a1839f099d239a81d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d3ef32893fcf4936af25ef3a9b7bf0d0db76c443a3b0c5a1839f099d239a81d", kill_on_drop: false }`
[INFO] [stdout] 3d3ef32893fcf4936af25ef3a9b7bf0d0db76c443a3b0c5a1839f099d239a81d