[INFO] fetching crate mecs 0.1.1...
[INFO] testing mecs-0.1.1 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate mecs 0.1.1 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate mecs 0.1.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mecs 0.1.1
[INFO] finished tweaking crates.io crate mecs 0.1.1
[INFO] tweaked toml for crates.io crate mecs 0.1.1 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 41978c8e2eee97b6463a1b1bdb12087c5de46d641504bc1ec371c691783a8283
[INFO] running `Command { std: "docker" "start" "-a" "41978c8e2eee97b6463a1b1bdb12087c5de46d641504bc1ec371c691783a8283", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41978c8e2eee97b6463a1b1bdb12087c5de46d641504bc1ec371c691783a8283", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41978c8e2eee97b6463a1b1bdb12087c5de46d641504bc1ec371c691783a8283", kill_on_drop: false }`
[INFO] [stdout] 41978c8e2eee97b6463a1b1bdb12087c5de46d641504bc1ec371c691783a8283
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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" "RUSTFLAGS=--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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0ba67d212ecd67b6470760a5a87de04ddd8504477ecf298ef25c69b415df5d3d
[INFO] running `Command { std: "docker" "start" "-a" "0ba67d212ecd67b6470760a5a87de04ddd8504477ecf298ef25c69b415df5d3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling mecs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(external_doc    )]
[INFO] [stdout]   |            ^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: use #[doc = include_str!("filename")] instead, which handles macro invocations
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(unboxed_closures)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(fn_traits       )]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(external_doc    )]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unknown `doc` attribute `include`
[INFO] [stdout]   --> src/lib.rs:51:7
[INFO] [stdout]    |
[INFO] [stdout] 51 | #[doc(include = "../README.md")]
[INFO] [stdout]    | ------^^^^^^^^^^^^^^^^^^^^^^^^-- help: use `doc = include_str!` instead: `#[doc = include_str!("../README.md")]`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(invalid_doc_attributes)]` 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 #82730 <https://github.com/rust-lang/rust/issues/82730>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mecs` due to 5 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "0ba67d212ecd67b6470760a5a87de04ddd8504477ecf298ef25c69b415df5d3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ba67d212ecd67b6470760a5a87de04ddd8504477ecf298ef25c69b415df5d3d", kill_on_drop: false }`
[INFO] [stdout] 0ba67d212ecd67b6470760a5a87de04ddd8504477ecf298ef25c69b415df5d3d
