[INFO] updating cached repository Techno-coder/signal_processing
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Techno-coder/signal_processing
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Techno-coder/signal_processing" "work/ex/beta-1.38-1/sources/1.37.0/gh/Techno-coder/signal_processing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Techno-coder/signal_processing'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Techno-coder/signal_processing" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Techno-coder/signal_processing"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Techno-coder/signal_processing'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d1d7662c539132ab3c9cf7d4e99f3c5159b6c150
[INFO] sha for GitHub repo Techno-coder/signal_processing: d1d7662c539132ab3c9cf7d4e99f3c5159b6c150
[INFO] validating manifest of Techno-coder/signal_processing 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 Techno-coder/signal_processing 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 Techno-coder/signal_processing
[INFO] finished frobbing Techno-coder/signal_processing
[INFO] frobbed toml for Techno-coder/signal_processing written to work/ex/beta-1.38-1/sources/1.37.0/gh/Techno-coder/signal_processing/Cargo.toml
[INFO] started frobbing Techno-coder/signal_processing
[INFO] finished frobbing Techno-coder/signal_processing
[INFO] frobbed toml for Techno-coder/signal_processing written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Techno-coder/signal_processing/Cargo.toml
[INFO] crate Techno-coder/signal_processing 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 Techno-coder/signal_processing 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/Techno-coder/signal_processing:/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] 90244848f696be76c45b67db64c7188aaa7c0900e2211125ca902ab9f1975988
[INFO] running `"docker" "start" "-a" "90244848f696be76c45b67db64c7188aaa7c0900e2211125ca902ab9f1975988"`
[INFO] [stderr]    Compiling rustfft v2.1.0
[INFO] [stderr]    Compiling signal_processing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(self_struct_ctor)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `signal_processing`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "90244848f696be76c45b67db64c7188aaa7c0900e2211125ca902ab9f1975988"`
[INFO] running `"docker" "rm" "-f" "90244848f696be76c45b67db64c7188aaa7c0900e2211125ca902ab9f1975988"`
[INFO] [stdout] 90244848f696be76c45b67db64c7188aaa7c0900e2211125ca902ab9f1975988