[INFO] updating cached repository neosam/textgame
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/neosam/textgame
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/neosam/textgame" "work/ex/beta-1.38-1/sources/1.37.0/gh/neosam/textgame"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/neosam/textgame'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/neosam/textgame" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosam/textgame"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosam/textgame'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 359186b26b43ed6453980eac3a07663519895243
[INFO] sha for GitHub repo neosam/textgame: 359186b26b43ed6453980eac3a07663519895243
[INFO] validating manifest of neosam/textgame 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 neosam/textgame 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 neosam/textgame
[INFO] finished frobbing neosam/textgame
[INFO] frobbed toml for neosam/textgame written to work/ex/beta-1.38-1/sources/1.37.0/gh/neosam/textgame/Cargo.toml
[INFO] started frobbing neosam/textgame
[INFO] finished frobbing neosam/textgame
[INFO] frobbed toml for neosam/textgame written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosam/textgame/Cargo.toml
[INFO] crate neosam/textgame 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing neosam/textgame against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosam/textgame:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 8801a782c2fa642aace713eb4218c04248ef363796ccc2a7cd1ff100a2f8d9be
[INFO] running `"docker" "start" "-a" "8801a782c2fa642aace713eb4218c04248ef363796ccc2a7cd1ff100a2f8d9be"`
[INFO] [stderr]    Compiling quote v0.3.10
[INFO] [stderr]    Compiling syn v0.10.3
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.1
[INFO] [stderr]    Compiling serde_codegen v0.8.19
[INFO] [stderr]    Compiling serde_derive v0.8.19
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.19/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro, proc_macro_lib)]
[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 `serde_derive`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8801a782c2fa642aace713eb4218c04248ef363796ccc2a7cd1ff100a2f8d9be"`
[INFO] running `"docker" "rm" "-f" "8801a782c2fa642aace713eb4218c04248ef363796ccc2a7cd1ff100a2f8d9be"`
[INFO] [stdout] 8801a782c2fa642aace713eb4218c04248ef363796ccc2a7cd1ff100a2f8d9be