[INFO] crate specialize 0.0.3 is already in cache
[INFO] testing specialize-0.0.3 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate specialize 0.0.3 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate specialize 0.0.3 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate specialize 0.0.3
[INFO] finished tweaking crates.io crate specialize 0.0.3
[INFO] tweaked toml for crates.io crate specialize 0.0.3 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c6606990cceaeb3fc9726f0d789276f486ff13a001ae820b8c522ab6e925346
[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" "4c6606990cceaeb3fc9726f0d789276f486ff13a001ae820b8c522ab6e925346", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c6606990cceaeb3fc9726f0d789276f486ff13a001ae820b8c522ab6e925346", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c6606990cceaeb3fc9726f0d789276f486ff13a001ae820b8c522ab6e925346", kill_on_drop: false }`
[INFO] [stdout] 4c6606990cceaeb3fc9726f0d789276f486ff13a001ae820b8c522ab6e925346
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+beta-2020-07-24" "build" "--frozen" "--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] 17196c1318243c0f8a2c2b8ffafb9962ad34682604f9b9edc51efb035d406f3e
[INFO] running `Command { std: "docker" "start" "-a" "17196c1318243c0f8a2c2b8ffafb9962ad34682604f9b9edc51efb035d406f3e", kill_on_drop: false }`
[INFO] [stderr]    Compiling specialize v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "17196c1318243c0f8a2c2b8ffafb9962ad34682604f9b9edc51efb035d406f3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17196c1318243c0f8a2c2b8ffafb9962ad34682604f9b9edc51efb035d406f3e", kill_on_drop: false }`
[INFO] [stdout] 17196c1318243c0f8a2c2b8ffafb9962ad34682604f9b9edc51efb035d406f3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+beta-2020-07-24" "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] dab08f2c42ee8e0f025abc5cc44aaa5ad72c759170f68cfaf331dd90d0e62372
[INFO] running `Command { std: "docker" "start" "-a" "dab08f2c42ee8e0f025abc5cc44aaa5ad72c759170f68cfaf331dd90d0e62372", kill_on_drop: false }`
[INFO] [stderr]    Compiling specialize v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(test, feature(specialization))]
[INFO] [stdout]   |                   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:1:27
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(test, feature(specialization))]
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: patterns aren't allowed in functions without bodies
[INFO] [stdout]    --> src/lib.rs:594:65
[INFO] [stdout]     |
[INFO] [stdout] 594 |                 trait fn WriteTest::write_test[W: Write](&self, mut w: W) -> io::Result<()>;
[INFO] [stdout]     |                                                                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(patterns_in_fns_without_body)]` on by default
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: for more information, see issue #35203 <https://github.com/rust-lang/rust/issues/35203>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `specialize`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "dab08f2c42ee8e0f025abc5cc44aaa5ad72c759170f68cfaf331dd90d0e62372", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dab08f2c42ee8e0f025abc5cc44aaa5ad72c759170f68cfaf331dd90d0e62372", kill_on_drop: false }`
[INFO] [stdout] dab08f2c42ee8e0f025abc5cc44aaa5ad72c759170f68cfaf331dd90d0e62372