[INFO] cloning repository playXE/ExVM-RS
[INFO] running `"git" "clone" "--bare" "git://github.com/playXE/ExVM-RS.git" "work/cache/sources/gh/playXE/ExVM-RS"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/playXE/ExVM-RS'...
[INFO] running `"git" "clone" "work/cache/sources/gh/playXE/ExVM-RS" "work/ex/beta-1.37-6/sources/1.36.0/gh/playXE/ExVM-RS"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/playXE/ExVM-RS'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/playXE/ExVM-RS" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/playXE/ExVM-RS"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/playXE/ExVM-RS'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 52f669fa30ec3445ac8cc35e1ccae8f5c6058704
[INFO] sha for GitHub repo playXE/ExVM-RS: 52f669fa30ec3445ac8cc35e1ccae8f5c6058704
[INFO] validating manifest of playXE/ExVM-RS 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 playXE/ExVM-RS 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 playXE/ExVM-RS
[INFO] finished frobbing playXE/ExVM-RS
[INFO] frobbed toml for playXE/ExVM-RS written to work/ex/beta-1.37-6/sources/1.36.0/gh/playXE/ExVM-RS/Cargo.toml
[INFO] started frobbing playXE/ExVM-RS
[INFO] finished frobbing playXE/ExVM-RS
[INFO] frobbed toml for playXE/ExVM-RS written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/playXE/ExVM-RS/Cargo.toml
[INFO] crate playXE/ExVM-RS already has a lockfile, it will not be regenerated
[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 playXE/ExVM-RS 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-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/playXE/ExVM-RS:/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] 3b2a5677deae432589abc617164513af91b3032043571e7e1206e5572b20dd1a
[INFO] running `"docker" "start" "-a" "3b2a5677deae432589abc617164513af91b3032043571e7e1206e5572b20dd1a"`
[INFO] [stderr]    Compiling libc v0.2.59
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling exvm 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(const_fn)]
[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(const_raw_ptr_to_usize_cast)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::os::ProtType`
[INFO] [stderr]  --> src/gc/copying.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::os::ProtType;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[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 `exvm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3b2a5677deae432589abc617164513af91b3032043571e7e1206e5572b20dd1a"`
[INFO] running `"docker" "rm" "-f" "3b2a5677deae432589abc617164513af91b3032043571e7e1206e5572b20dd1a"`
[INFO] [stdout] 3b2a5677deae432589abc617164513af91b3032043571e7e1206e5572b20dd1a