[INFO] updating cached repository gavynriebau/rrat
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/gavynriebau/rrat
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/gavynriebau/rrat" "work/ex/beta-1.38-1/sources/1.37.0/gh/gavynriebau/rrat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/gavynriebau/rrat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/gavynriebau/rrat" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gavynriebau/rrat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gavynriebau/rrat'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9f1e49d8a73648a81c501d4c22c5707e62c44c9b
[INFO] sha for GitHub repo gavynriebau/rrat: 9f1e49d8a73648a81c501d4c22c5707e62c44c9b
[INFO] validating manifest of gavynriebau/rrat 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 gavynriebau/rrat 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 gavynriebau/rrat
[INFO] finished frobbing gavynriebau/rrat
[INFO] frobbed toml for gavynriebau/rrat written to work/ex/beta-1.38-1/sources/1.37.0/gh/gavynriebau/rrat/Cargo.toml
[INFO] started frobbing gavynriebau/rrat
[INFO] finished frobbing gavynriebau/rrat
[INFO] frobbed toml for gavynriebau/rrat written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gavynriebau/rrat/Cargo.toml
[INFO] crate gavynriebau/rrat 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] testing gavynriebau/rrat 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/gavynriebau/rrat:/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] 3ba6401d06adb7333eb8bebc643988ee4e9ff9ad29bd36ba8b63f262a3086993
[INFO] running `"docker" "start" "-a" "3ba6401d06adb7333eb8bebc643988ee4e9ff9ad29bd36ba8b63f262a3086993"`
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling env_logger v0.5.2
[INFO] [stderr]    Compiling rrat 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(libc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via `Cargo.toml` instead?
[INFO] [stderr]   --> src/main.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | extern crate libc;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rrat`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3ba6401d06adb7333eb8bebc643988ee4e9ff9ad29bd36ba8b63f262a3086993"`
[INFO] running `"docker" "rm" "-f" "3ba6401d06adb7333eb8bebc643988ee4e9ff9ad29bd36ba8b63f262a3086993"`
[INFO] [stdout] 3ba6401d06adb7333eb8bebc643988ee4e9ff9ad29bd36ba8b63f262a3086993