[INFO] crate rx_gtk 0.1.1 is already in cache
[INFO] extracting crate rx_gtk 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/rx_gtk/0.1.1
[INFO] extracting crate rx_gtk 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rx_gtk/0.1.1
[INFO] validating manifest of rx_gtk-0.1.1 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rx_gtk-0.1.1 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rx_gtk-0.1.1
[INFO] finished frobbing rx_gtk-0.1.1
[INFO] frobbed toml for rx_gtk-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rx_gtk/0.1.1/Cargo.toml
[INFO] started frobbing rx_gtk-0.1.1
[INFO] finished frobbing rx_gtk-0.1.1
[INFO] frobbed toml for rx_gtk-0.1.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rx_gtk/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rx_gtk-0.1.1 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rx_gtk/0.1.1:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] be203f53740a8deb32395406f54606332bfd0f1aa6f81e7fb6b0f1a2d005d927
[INFO] running `"docker" "start" "-a" "be203f53740a8deb32395406f54606332bfd0f1aa6f81e7fb6b0f1a2d005d927"`
[INFO] [stderr]    Compiling gio v0.5.1
[INFO] [stderr]    Compiling gdk-pixbuf v0.5.0
[INFO] [stderr]    Compiling gdk v0.9.0
[INFO] [stderr]    Compiling gtk v0.5.0
[INFO] [stderr]    Compiling rxrs v0.1.0-alpha4
[INFO] [stderr]    Compiling glib-sys v0.7.0
[INFO] [stderr]    Compiling gobject-sys v0.7.0
[INFO] [stderr]    Compiling gio-sys v0.7.0
[INFO] [stderr]    Compiling pango-sys v0.7.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rxrs-0.1.0-alpha4/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / #![feature(fn_traits, unboxed_closures, integer_atomics, optin_builtin_traits, fnbox,
[INFO] [stderr] 2 | |     test, cell_update, box_syntax, coerce_unsized, unsize,
[INFO] [stderr] 3 | | )]
[INFO] [stderr]   | |__^
[INFO] [stderr] 
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.7.0
[INFO] [stderr]    Compiling gdk-sys v0.7.0
[INFO] [stderr]    Compiling gtk-sys v0.7.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.7.0
[INFO] [stderr]    Compiling atk-sys v0.7.0
[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 `rxrs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "be203f53740a8deb32395406f54606332bfd0f1aa6f81e7fb6b0f1a2d005d927"`
[INFO] running `"docker" "rm" "-f" "be203f53740a8deb32395406f54606332bfd0f1aa6f81e7fb6b0f1a2d005d927"`
[INFO] [stdout] be203f53740a8deb32395406f54606332bfd0f1aa6f81e7fb6b0f1a2d005d927