[INFO] crate rustcov 0.0.0 is already in cache
[INFO] testing rustcov-0.0.0 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate rustcov 0.0.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate rustcov 0.0.0 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 rustcov 0.0.0
[INFO] finished tweaking crates.io crate rustcov 0.0.0
[INFO] tweaked toml for crates.io crate rustcov 0.0.0 written to /workspace/builds/worker-9/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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 8b9c5e0958f80ce82722867b736a36714d21b0f6ed6360c369741b1a35070d6c
[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" "8b9c5e0958f80ce82722867b736a36714d21b0f6ed6360c369741b1a35070d6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8b9c5e0958f80ce82722867b736a36714d21b0f6ed6360c369741b1a35070d6c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b9c5e0958f80ce82722867b736a36714d21b0f6ed6360c369741b1a35070d6c", kill_on_drop: false }`
[INFO] [stdout] 8b9c5e0958f80ce82722867b736a36714d21b0f6ed6360c369741b1a35070d6c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stdout] 03ff5ad564e7f3547cf2ff757b8c6f0b92fee975da3152e789b46711c55ee86e
[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" "03ff5ad564e7f3547cf2ff757b8c6f0b92fee975da3152e789b46711c55ee86e", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustcov v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "03ff5ad564e7f3547cf2ff757b8c6f0b92fee975da3152e789b46711c55ee86e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03ff5ad564e7f3547cf2ff757b8c6f0b92fee975da3152e789b46711c55ee86e", kill_on_drop: false }`
[INFO] [stdout] 03ff5ad564e7f3547cf2ff757b8c6f0b92fee975da3152e789b46711c55ee86e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stdout] de3097271a42114240733f20d05277d80fc636ed61b745e8c0efb9453f331bb0
[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" "de3097271a42114240733f20d05277d80fc636ed61b745e8c0efb9453f331bb0", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustcov v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0457]: plugin `rustcov` only found in rlib format, but must be available in dylib format
[INFO] [stdout]  --> examples/plugin.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![plugin(rustcov)]
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> examples/plugin.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(plugin)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
[INFO] [stdout]  --> examples/plugin.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![plugin(rustcov)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `plugin`
[INFO] [stdout]   --> examples/plugin.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout] 1  | / #![feature(plugin)]
[INFO] [stdout] 2  | | #![plugin(rustcov)]
[INFO] [stdout] 3  | |
[INFO] [stdout] 4  | | fn fizzbuzz(n: i32) -> String {
[INFO] [stdout] ...  |
[INFO] [stdout] 14 | |     assert_eq!(fizzbuzz(3), "fizz");
[INFO] [stdout] 15 | | }
[INFO] [stdout]    | |_^ consider adding a `main` function to `examples/plugin.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0601.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustcov`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "de3097271a42114240733f20d05277d80fc636ed61b745e8c0efb9453f331bb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de3097271a42114240733f20d05277d80fc636ed61b745e8c0efb9453f331bb0", kill_on_drop: false }`
[INFO] [stdout] de3097271a42114240733f20d05277d80fc636ed61b745e8c0efb9453f331bb0