[INFO] fetching crate xtra 0.5.0-beta.4...
[INFO] testing xtra-0.5.0-beta.4 against 1.45.2 for beta-1.46-1
[INFO] extracting crate xtra 0.5.0-beta.4 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate xtra 0.5.0-beta.4 on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate xtra 0.5.0-beta.4
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate xtra 0.5.0-beta.4
[INFO] tweaked toml for crates.io crate xtra 0.5.0-beta.4 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate xtra 0.5.0-beta.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 734d450d958faf19d6d994f40f853d25e974e8e2693184a5cce0fb2086b5f6d9
[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" "734d450d958faf19d6d994f40f853d25e974e8e2693184a5cce0fb2086b5f6d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "734d450d958faf19d6d994f40f853d25e974e8e2693184a5cce0fb2086b5f6d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "734d450d958faf19d6d994f40f853d25e974e8e2693184a5cce0fb2086b5f6d9", kill_on_drop: false }`
[INFO] [stdout] 734d450d958faf19d6d994f40f853d25e974e8e2693184a5cce0fb2086b5f6d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "RUSTFLAGS=--cap-lints=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e8995399b7e193dcdcbf5c44eeb7918bd878e9347c8112d53228a6237c1411f
[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" "7e8995399b7e193dcdcbf5c44eeb7918bd878e9347c8112d53228a6237c1411f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling async-trait v0.1.36
[INFO] [stderr]    Compiling pin-project v0.4.22
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling xtra v0.5.0-beta.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.95s
[INFO] running `Command { std: "docker" "inspect" "7e8995399b7e193dcdcbf5c44eeb7918bd878e9347c8112d53228a6237c1411f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e8995399b7e193dcdcbf5c44eeb7918bd878e9347c8112d53228a6237c1411f", kill_on_drop: false }`
[INFO] [stdout] 7e8995399b7e193dcdcbf5c44eeb7918bd878e9347c8112d53228a6237c1411f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "RUSTFLAGS=--cap-lints=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--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] a9b99d9aaa51c60f031e96b2b3f28a69c5f3a47314b9680e46d4cab875ef3caa
[INFO] running `Command { std: "docker" "start" "-a" "a9b99d9aaa51c60f031e96b2b3f28a69c5f3a47314b9680e46d4cab875ef3caa", kill_on_drop: false }`
[INFO] [stderr]    Compiling cache-padded v1.1.0
[INFO] [stderr]    Compiling vec-arena v0.5.0
[INFO] [stderr]    Compiling event-listener v2.2.1
[INFO] [stderr]    Compiling easy-parallel v3.1.0
[INFO] [stderr]    Compiling futures-lite v0.1.10
[INFO] [stderr]    Compiling concurrent-queue v1.1.1
[INFO] [stderr]    Compiling multitask v0.2.0
[INFO] [stderr]    Compiling async-channel v1.2.0
[INFO] [stderr]    Compiling async-io v0.1.6
[INFO] [stderr]    Compiling blocking v0.5.0
[INFO] [stderr]    Compiling async-executor v0.1.2
[INFO] [stderr]    Compiling smol v0.3.3
[INFO] [stderr]    Compiling xtra v0.5.0-beta.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.20s
[INFO] running `Command { std: "docker" "inspect" "a9b99d9aaa51c60f031e96b2b3f28a69c5f3a47314b9680e46d4cab875ef3caa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9b99d9aaa51c60f031e96b2b3f28a69c5f3a47314b9680e46d4cab875ef3caa", kill_on_drop: false }`
[INFO] [stdout] a9b99d9aaa51c60f031e96b2b3f28a69c5f3a47314b9680e46d4cab875ef3caa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "RUSTFLAGS=--cap-lints=warn" "-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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fb77cb47ebb948797efae8c16fe6703bb61971f6011f2d76ca9bb04510c84610
[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" "fb77cb47ebb948797efae8c16fe6703bb61971f6011f2d76ca9bb04510c84610", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.16s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/xtra-a414b68d7cd95d03
[INFO] [stderr]    Doc-tests xtra
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> /opt/rustwide/workdir/src/lib.rs:3:18
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![cfg_attr(doc, feature(doc_cfg, external_doc))]
[INFO] [stderr]   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "fb77cb47ebb948797efae8c16fe6703bb61971f6011f2d76ca9bb04510c84610", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb77cb47ebb948797efae8c16fe6703bb61971f6011f2d76ca9bb04510c84610", kill_on_drop: false }`
[INFO] [stdout] fb77cb47ebb948797efae8c16fe6703bb61971f6011f2d76ca9bb04510c84610