[INFO] updating cached repository vhdirk/gnome-class
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vhdirk/gnome-class
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vhdirk/gnome-class" "work/ex/beta-1.38-1/sources/1.37.0/gh/vhdirk/gnome-class"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vhdirk/gnome-class'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vhdirk/gnome-class" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vhdirk/gnome-class"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vhdirk/gnome-class'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d01a5b2e1ac893a3b3a118992e9943c9c01f67c0
[INFO] sha for GitHub repo vhdirk/gnome-class: d01a5b2e1ac893a3b3a118992e9943c9c01f67c0
[INFO] validating manifest of vhdirk/gnome-class 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 vhdirk/gnome-class 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 vhdirk/gnome-class
[INFO] finished frobbing vhdirk/gnome-class
[INFO] frobbed toml for vhdirk/gnome-class written to work/ex/beta-1.38-1/sources/1.37.0/gh/vhdirk/gnome-class/Cargo.toml
[INFO] started frobbing vhdirk/gnome-class
[INFO] finished frobbing vhdirk/gnome-class
[INFO] frobbed toml for vhdirk/gnome-class written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vhdirk/gnome-class/Cargo.toml
[INFO] crate vhdirk/gnome-class 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing vhdirk/gnome-class 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vhdirk/gnome-class:/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] 56ef52fea9f322ac8a67ce397a92b6a9e65cbf08b3c688eb034402fc7a04d509
[INFO] running `"docker" "start" "-a" "56ef52fea9f322ac8a67ce397a92b6a9e65cbf08b3c688eb034402fc7a04d509"`
[INFO] [stderr]    Compiling rustc-ap-serialize v94.0.0
[INFO] [stderr]    Compiling scoped-tls v0.1.1
[INFO] [stderr]    Compiling serde v1.0.38
[INFO] [stderr]    Compiling rustc-ap-syntax v94.0.0
[INFO] [stderr]    Compiling compiletest_rs v0.3.10
[INFO] [stderr]    Compiling rustfmt-nightly v0.4.2
[INFO] [stderr]    Compiling getopts v0.2.17
[INFO] [stderr]    Compiling diff v0.1.11
[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/scoped-tls-0.1.1/src/lib.rs:47:34
[INFO] [stderr]    |
[INFO] [stderr] 47 | #![cfg_attr(feature = "nightly", feature(macro_vis_matcher))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/scoped-tls-0.1.1/src/lib.rs:48:34
[INFO] [stderr]    |
[INFO] [stderr] 48 | #![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
[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 `scoped-tls`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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/rustc-ap-serialize-94.0.0/lib.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | #![feature(rustc_private, box_syntax)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-94.0.0/lib.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(core_intrinsics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/rustc-ap-serialize-94.0.0/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![feature(specialization)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rustc-ap-serialize`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "56ef52fea9f322ac8a67ce397a92b6a9e65cbf08b3c688eb034402fc7a04d509"`
[INFO] running `"docker" "rm" "-f" "56ef52fea9f322ac8a67ce397a92b6a9e65cbf08b3c688eb034402fc7a04d509"`
[INFO] [stdout] 56ef52fea9f322ac8a67ce397a92b6a9e65cbf08b3c688eb034402fc7a04d509