[INFO] fetching crate snafu 0.7.1...
[INFO] documenting snafu-0.7.1 against try#6fd27704e643b25711e6a97ec2b04873b411b97d for pr-96676
[INFO] extracting crate snafu 0.7.1 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate snafu 0.7.1 on toolchain 6fd27704e643b25711e6a97ec2b04873b411b97d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate snafu 0.7.1
[INFO] finished tweaking crates.io crate snafu 0.7.1
[INFO] tweaked toml for crates.io crate snafu 0.7.1 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f36054ad098f364095652a5a47ea3bd6338501132495888002952ac19b36bd3f
[INFO] running `Command { std: "docker" "start" "-a" "f36054ad098f364095652a5a47ea3bd6338501132495888002952ac19b36bd3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f36054ad098f364095652a5a47ea3bd6338501132495888002952ac19b36bd3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f36054ad098f364095652a5a47ea3bd6338501132495888002952ac19b36bd3f", kill_on_drop: false }`
[INFO] [stdout] f36054ad098f364095652a5a47ea3bd6338501132495888002952ac19b36bd3f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9066bad8249be29fd85f7f2f510ea3be1c6f53586ce653c3ecf9cef1811336f
[INFO] running `Command { std: "docker" "start" "-a" "c9066bad8249be29fd85f7f2f510ea3be1c6f53586ce653c3ecf9cef1811336f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling syn v1.0.92
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling snafu-derive v0.7.1
[INFO] [stderr]  Documenting snafu v0.7.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.85s
[INFO] running `Command { std: "docker" "inspect" "c9066bad8249be29fd85f7f2f510ea3be1c6f53586ce653c3ecf9cef1811336f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9066bad8249be29fd85f7f2f510ea3be1c6f53586ce653c3ecf9cef1811336f", kill_on_drop: false }`
[INFO] [stdout] c9066bad8249be29fd85f7f2f510ea3be1c6f53586ce653c3ecf9cef1811336f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "RUSTC_BOOTSTRAP=1" "-e" "DOCS_RS=1" "-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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "std backtraces futures guide" "--frozen" "--message-format=json" "--" "-Z" "unstable-options" "--document-private-items", kill_on_drop: false }`
[INFO] [stdout] df92704eed2c53fcd3a85cbdf27bd163edde2f755112a520d98402721fcc64c1
[INFO] running `Command { std: "docker" "start" "-a" "df92704eed2c53fcd3a85cbdf27bd163edde2f755112a520d98402721fcc64c1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling syn v1.0.92
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling libc v0.2.125
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking object v0.28.3
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling snafu-derive v0.7.1
[INFO] [stderr]     Checking pin-project v1.0.10
[INFO] [stderr]  Documenting snafu v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]   --> src/guide/examples/basic.rs:19:56
[INFO] [stdout]    |
[INFO] [stdout] 19 | /// [`LeafSnafu::build`] or [`LeafSnafu::fail`]. The [`ensure`] macro also
[INFO] [stdout]    |                                                        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(rustdoc::macro_rules_fallback)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `snafu`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name snafu src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="backtrace"' --cfg 'feature="backtraces"' --cfg 'feature="default"' --cfg 'feature="futures"' --cfg 'feature="futures-core-crate"' --cfg 'feature="guide"' --cfg 'feature="pin-project"' --cfg 'feature="rust_1_46"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat -Z unstable-options --document-private-items -C metadata=cfb67145aedbe9b8 -L dependency=/opt/rustwide/target/debug/deps --extern backtrace=/opt/rustwide/target/debug/deps/libbacktrace-ac9b299e106c52da.rmeta --extern doc_comment=/opt/rustwide/target/debug/deps/libdoc_comment-02ce12fd6be184e8.rmeta --extern futures_core_crate=/opt/rustwide/target/debug/deps/libfutures_core-ba2e380585d2c719.rmeta --extern pin_project=/opt/rustwide/target/debug/deps/libpin_project-54d2b0343fe93ff9.rmeta --extern snafu_derive=/opt/rustwide/target/debug/deps/libsnafu_derive-acdb42e3381ef4bd.so --extern-html-root-url 'backtrace=https://docs.rs/backtrace/0.3.65/' --extern-html-root-url 'doc_comment=https://docs.rs/doc-comment/0.3.3/' --extern-html-root-url 'futures_core=https://docs.rs/futures-core/0.3.21/' --extern-html-root-url 'pin_project=https://docs.rs/pin-project/1.0.10/' --extern-html-root-url 'snafu_derive=https://docs.rs/snafu-derive/0.7.1/' -Zunstable-options --crate-version 0.7.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "df92704eed2c53fcd3a85cbdf27bd163edde2f755112a520d98402721fcc64c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df92704eed2c53fcd3a85cbdf27bd163edde2f755112a520d98402721fcc64c1", kill_on_drop: false }`
[INFO] [stdout] df92704eed2c53fcd3a85cbdf27bd163edde2f755112a520d98402721fcc64c1