[INFO] fetching crate qcollect-traits 0.7.4...
[INFO] documenting qcollect-traits-0.7.4 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate qcollect-traits 0.7.4 into /workspace/builds/worker-25/source
[INFO] validating manifest of crates.io crate qcollect-traits 0.7.4 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate qcollect-traits 0.7.4
[INFO] finished tweaking crates.io crate qcollect-traits 0.7.4
[INFO] tweaked toml for crates.io crate qcollect-traits 0.7.4 written to /workspace/builds/worker-25/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--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 bit-vec v0.4.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5ef96473f3973901d7beb177efec7304e9dfab9e9005a641ac21cb8b732fffe
[INFO] running `Command { std: "docker" "start" "-a" "f5ef96473f3973901d7beb177efec7304e9dfab9e9005a641ac21cb8b732fffe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5ef96473f3973901d7beb177efec7304e9dfab9e9005a641ac21cb8b732fffe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5ef96473f3973901d7beb177efec7304e9dfab9e9005a641ac21cb8b732fffe", kill_on_drop: false }`
[INFO] [stdout] f5ef96473f3973901d7beb177efec7304e9dfab9e9005a641ac21cb8b732fffe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/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=warn" "-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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 47c7dee1aefcea3f7d3db9448a58de6587ed338ca6c448149c1d4712e545d0c9
[INFO] running `Command { std: "docker" "start" "-a" "47c7dee1aefcea3f7d3db9448a58de6587ed338ca6c448149c1d4712e545d0c9", kill_on_drop: false }`
[INFO] [stderr]     Checking vec_map v0.3.0
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]  Documenting qcollect-traits v0.7.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:51:1
[INFO] [stdout]    |
[INFO] [stdout] 51 | / #![feature(
[INFO] [stdout] 52 | |     associated_type_defaults,
[INFO] [stdout] 53 | |     collections, 
[INFO] [stdout] 54 | |     collections_bound, 
[INFO] [stdout] 55 | |     btree_range, 
[INFO] [stdout] 56 | |     drain,
[INFO] [stdout] 57 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `qcollect-traits`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name qcollect_traits src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=d0cb0b15f99e2b1a -L dependency=/opt/rustwide/target/debug/deps --extern bit_vec=/opt/rustwide/target/debug/deps/libbit_vec-2d28d76e39163e03.rmeta --extern vec_map=/opt/rustwide/target/debug/deps/libvec_map-edb7226b510a8281.rmeta --cap-lints=warn --crate-version 0.7.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "47c7dee1aefcea3f7d3db9448a58de6587ed338ca6c448149c1d4712e545d0c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47c7dee1aefcea3f7d3db9448a58de6587ed338ca6c448149c1d4712e545d0c9", kill_on_drop: false }`
[INFO] [stdout] 47c7dee1aefcea3f7d3db9448a58de6587ed338ca6c448149c1d4712e545d0c9