[INFO] updating cached repository commiebstrd/rusterpreter
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/commiebstrd/rusterpreter
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/commiebstrd/rusterpreter" "work/ex/beta-1.38-1/sources/1.37.0/gh/commiebstrd/rusterpreter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/commiebstrd/rusterpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/commiebstrd/rusterpreter" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/commiebstrd/rusterpreter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/commiebstrd/rusterpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d5849f656c4405dfcea54854fe4ca45f043ebaf4
[INFO] sha for GitHub repo commiebstrd/rusterpreter: d5849f656c4405dfcea54854fe4ca45f043ebaf4
[INFO] validating manifest of commiebstrd/rusterpreter 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 commiebstrd/rusterpreter 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 commiebstrd/rusterpreter
[INFO] finished frobbing commiebstrd/rusterpreter
[INFO] frobbed toml for commiebstrd/rusterpreter written to work/ex/beta-1.38-1/sources/1.37.0/gh/commiebstrd/rusterpreter/Cargo.toml
[INFO] started frobbing commiebstrd/rusterpreter
[INFO] finished frobbing commiebstrd/rusterpreter
[INFO] frobbed toml for commiebstrd/rusterpreter written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/commiebstrd/rusterpreter/Cargo.toml
[INFO] crate commiebstrd/rusterpreter 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 commiebstrd/rusterpreter 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/commiebstrd/rusterpreter:/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] 087ee7999868d7eb51b53d22d91406329a02de81a3fbdf8320bd479339b4508d
[INFO] running `"docker" "start" "-a" "087ee7999868d7eb51b53d22d91406329a02de81a3fbdf8320bd479339b4508d"`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling rusterpreter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> lib/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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 `rusterpreter`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "087ee7999868d7eb51b53d22d91406329a02de81a3fbdf8320bd479339b4508d"`
[INFO] running `"docker" "rm" "-f" "087ee7999868d7eb51b53d22d91406329a02de81a3fbdf8320bd479339b4508d"`
[INFO] [stdout] 087ee7999868d7eb51b53d22d91406329a02de81a3fbdf8320bd479339b4508d