[INFO] updating cached repository busarovalex/mp3-meta
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/busarovalex/mp3-meta
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/busarovalex/mp3-meta" "work/ex/beta-1.38-1/sources/1.37.0/gh/busarovalex/mp3-meta"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/busarovalex/mp3-meta'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/busarovalex/mp3-meta" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/busarovalex/mp3-meta"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/busarovalex/mp3-meta'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dc2f9188c6fba277153926f265aebfd61e5a7f37
[INFO] sha for GitHub repo busarovalex/mp3-meta: dc2f9188c6fba277153926f265aebfd61e5a7f37
[INFO] validating manifest of busarovalex/mp3-meta on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of busarovalex/mp3-meta on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing busarovalex/mp3-meta
[INFO] finished frobbing busarovalex/mp3-meta
[INFO] frobbed toml for busarovalex/mp3-meta written to work/ex/beta-1.38-1/sources/1.37.0/gh/busarovalex/mp3-meta/Cargo.toml
[INFO] started frobbing busarovalex/mp3-meta
[INFO] finished frobbing busarovalex/mp3-meta
[INFO] frobbed toml for busarovalex/mp3-meta written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/busarovalex/mp3-meta/Cargo.toml
[INFO] crate busarovalex/mp3-meta already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing busarovalex/mp3-meta against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/busarovalex/mp3-meta:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] bd03fc1e89bfd1d45d7bb980b4415706bfbf9e9760e0bb5c51f9d3e26b0231a9
[INFO] running `"docker" "start" "-a" "bd03fc1e89bfd1d45d7bb980b4415706bfbf9e9760e0bb5c51f9d3e26b0231a9"`
[INFO] [stderr]    Compiling cc v1.0.1
[INFO] [stderr]    Compiling derive_builder v0.4.7
[INFO] [stderr]    Compiling derive_builder_core v0.1.7
[INFO] [stderr]    Compiling regex v0.2.2
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling id3 v0.2.1 (https://github.com/jameshurst/rust-id3.git?rev=21ebef8706dd5f2b1bf6b05cc87ded3b20d54dcd#21ebef87)
[INFO] [stderr]    Compiling mp3meta v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(iterator_for_each)]
[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: Could not compile `mp3meta`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bd03fc1e89bfd1d45d7bb980b4415706bfbf9e9760e0bb5c51f9d3e26b0231a9"`
[INFO] running `"docker" "rm" "-f" "bd03fc1e89bfd1d45d7bb980b4415706bfbf9e9760e0bb5c51f9d3e26b0231a9"`
[INFO] [stdout] bd03fc1e89bfd1d45d7bb980b4415706bfbf9e9760e0bb5c51f9d3e26b0231a9