[INFO] fetching crate futures_ringbuf 0.2.1...
[INFO] documenting futures_ringbuf-0.2.1 against try#66dfc4e010913fbed0c4ea91fc2c010004b0f441 for pr-73566
[INFO] extracting crate futures_ringbuf 0.2.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate futures_ringbuf 0.2.1 on toolchain 66dfc4e010913fbed0c4ea91fc2c010004b0f441
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate futures_ringbuf 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate futures_ringbuf 0.2.1
[INFO] tweaked toml for crates.io crate futures_ringbuf 0.2.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate futures_ringbuf 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ergo-pin v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bdd4f94c12b3480248ec31f20a4b65a8e6dd07f7e6972708905574971e1c675b
[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" "bdd4f94c12b3480248ec31f20a4b65a8e6dd07f7e6972708905574971e1c675b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bdd4f94c12b3480248ec31f20a4b65a8e6dd07f7e6972708905574971e1c675b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdd4f94c12b3480248ec31f20a4b65a8e6dd07f7e6972708905574971e1c675b", kill_on_drop: false }`
[INFO] [stdout] bdd4f94c12b3480248ec31f20a4b65a8e6dd07f7e6972708905574971e1c675b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 265c7f031ec6fc35bf077e70dae93d9c0edf70216826a020468a285b0a752ac8
[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" "265c7f031ec6fc35bf077e70dae93d9c0edf70216826a020468a285b0a752ac8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]    Compiling proc-macro-hack v0.5.15
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking ringbuf v0.2.1
[INFO] [stderr]    Compiling futures_ringbuf v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]  Documenting futures_ringbuf v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `[TokioEndpoint]` cannot be resolved, ignoring it.
[INFO] [stdout]  --> src/lib.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |   #![ cfg_attr( nightly, doc    ( include = "../README.md" ) ) ]
[INFO] [stdout]   |  ________________________^
[INFO] [stdout] 3 | | #![ doc = "" ] // empty doc line to handle missing doc warning when the feature is missing.
[INFO] [stdout]   | |______________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(intra_doc_link_resolution_failure)]` on by default
[INFO] [stdout]   = note: the link appears in this line:
[INFO] [stdout]           
[INFO] [stdout]           Note: it wasn't convenient to implement a tokio version in the same type, so a new type is introduced, [TokioEndpoint].
[INFO] [stdout]                                                                                                                   ^^^^^^^^^^^^^
[INFO] [stdout]   = help: to escape `[` and `]` characters, just add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.13s
[INFO] running `Command { std: "docker" "inspect" "265c7f031ec6fc35bf077e70dae93d9c0edf70216826a020468a285b0a752ac8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "265c7f031ec6fc35bf077e70dae93d9c0edf70216826a020468a285b0a752ac8", kill_on_drop: false }`
[INFO] [stdout] 265c7f031ec6fc35bf077e70dae93d9c0edf70216826a020468a285b0a752ac8