[INFO] fetching crate merge-io 0.3.0...
[INFO] documenting merge-io-0.3.0 against master#394e1b40d264aa6928811919c1124fa248e7d802 for pr-73566
[INFO] extracting crate merge-io 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate merge-io 0.3.0 on toolchain 394e1b40d264aa6928811919c1124fa248e7d802
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate merge-io 0.3.0
[INFO] finished tweaking crates.io crate merge-io 0.3.0
[INFO] tweaked toml for crates.io crate merge-io 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4961e5434bd0bf56ef175f68cc6fc6cca5cd56340c8a67ee646cbf6845ea1261
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4961e5434bd0bf56ef175f68cc6fc6cca5cd56340c8a67ee646cbf6845ea1261", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4961e5434bd0bf56ef175f68cc6fc6cca5cd56340c8a67ee646cbf6845ea1261", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4961e5434bd0bf56ef175f68cc6fc6cca5cd56340c8a67ee646cbf6845ea1261", kill_on_drop: false }`
[INFO] [stdout] 4961e5434bd0bf56ef175f68cc6fc6cca5cd56340c8a67ee646cbf6845ea1261
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 21c4c2a4a095ed3b0f79bd79babe6aa3171707ab453159911a561d3cc9407449
[INFO] running `Command { std: "docker" "start" "-a" "21c4c2a4a095ed3b0f79bd79babe6aa3171707ab453159911a561d3cc9407449", kill_on_drop: false }`
[INFO] [stderr]  Documenting merge-io v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `[futures::io::AsyncRead]` cannot be resolved, ignoring it.
[INFO] [stdout]  --> src/lib.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | //! Merge two separate [`AsyncRead`](futures::io::AsyncRead) and
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^^^ cannot be resolved, ignoring
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
[INFO] [stdout]   = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `[futures::io::AsyncWrite]` cannot be resolved, ignoring it.
[INFO] [stdout]  --> src/lib.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 | //! [`AsyncWrite`](futures::io::AsyncWrite) objects into a single I/O stream.
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^^^^^^^^^^ cannot be resolved, ignoring
[INFO] [stdout]   |
[INFO] [stdout]   = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `[futures::io::AsyncRead]` cannot be resolved, ignoring it.
[INFO] [stdout]   --> src/lib.rs:48:19
[INFO] [stdout]    |
[INFO] [stdout] 48 | /// [`AsyncRead`](futures::io::AsyncRead) (`R`) and
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^ cannot be resolved, ignoring
[INFO] [stdout]    |
[INFO] [stdout]    = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `[futures::io::AsyncWrite]` cannot be resolved, ignoring it.
[INFO] [stdout]   --> src/lib.rs:49:20
[INFO] [stdout]    |
[INFO] [stdout] 49 | /// [`AsyncWrite`](futures::io::AsyncWrite) (`W`).
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^ cannot be resolved, ignoring
[INFO] [stdout]    |
[INFO] [stdout]    = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "21c4c2a4a095ed3b0f79bd79babe6aa3171707ab453159911a561d3cc9407449", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21c4c2a4a095ed3b0f79bd79babe6aa3171707ab453159911a561d3cc9407449", kill_on_drop: false }`
[INFO] [stdout] 21c4c2a4a095ed3b0f79bd79babe6aa3171707ab453159911a561d3cc9407449