[INFO] cloning repository https://github.com/busarovalex/mp3-meta
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/busarovalex/mp3-meta" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbusarovalex%2Fmp3-meta", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbusarovalex%2Fmp3-meta'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dc2f9188c6fba277153926f265aebfd61e5a7f37
[INFO] checking busarovalex/mp3-meta against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbusarovalex%2Fmp3-meta" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/busarovalex/mp3-meta on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/busarovalex/mp3-meta
[INFO] finished tweaking git repo https://github.com/busarovalex/mp3-meta
[INFO] tweaked toml for git repo https://github.com/busarovalex/mp3-meta written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/busarovalex/mp3-meta already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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 derive_builder v0.4.7
[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" "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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 88df92fa70ae5f8e9a97f5e4d527eef158d785a78605010b44a3bdcc5f2f1179
[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" "88df92fa70ae5f8e9a97f5e4d527eef158d785a78605010b44a3bdcc5f2f1179", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88df92fa70ae5f8e9a97f5e4d527eef158d785a78605010b44a3bdcc5f2f1179", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88df92fa70ae5f8e9a97f5e4d527eef158d785a78605010b44a3bdcc5f2f1179", kill_on_drop: false }`
[INFO] [stdout] 88df92fa70ae5f8e9a97f5e4d527eef158d785a78605010b44a3bdcc5f2f1179
[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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c39523356f40646837a52b40053f27c07eebcb2328f165a359cd4ee03e92a12f
[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" "c39523356f40646837a52b40053f27c07eebcb2328f165a359cd4ee03e92a12f", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.31
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling cc v1.0.1
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling derive_builder v0.4.7
[INFO] [stderr]     Checking lazy_static v0.2.9
[INFO] [stderr]     Checking bitflags v0.9.1
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking thread_local v0.3.4
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking term_size v0.3.0
[INFO] [stderr]     Checking atty v0.2.2
[INFO] [stderr]     Checking textwrap v0.8.0
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]     Checking clap v2.26.2
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]    Compiling derive_builder_core v0.1.7
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking id3 v0.2.1 (https://github.com/jameshurst/rust-id3.git?rev=21ebef8706dd5f2b1bf6b05cc87ded3b20d54dcd#21ebef87)
[INFO] [stderr]     Checking mp3meta v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_for_each)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_for_each)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mp3meta`
[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] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c39523356f40646837a52b40053f27c07eebcb2328f165a359cd4ee03e92a12f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c39523356f40646837a52b40053f27c07eebcb2328f165a359cd4ee03e92a12f", kill_on_drop: false }`
[INFO] [stdout] c39523356f40646837a52b40053f27c07eebcb2328f165a359cd4ee03e92a12f