[INFO] updating cached repository LuisAyuso/rgraph
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LuisAyuso/rgraph
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LuisAyuso/rgraph" "work/ex/beta-1.37-6/sources/1.36.0/gh/LuisAyuso/rgraph"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/LuisAyuso/rgraph'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LuisAyuso/rgraph" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/LuisAyuso/rgraph"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/LuisAyuso/rgraph'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] af743e2c32773a0578a03b741ccc736fa2d242fd
[INFO] sha for GitHub repo LuisAyuso/rgraph: af743e2c32773a0578a03b741ccc736fa2d242fd
[INFO] validating manifest of LuisAyuso/rgraph 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 LuisAyuso/rgraph 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 LuisAyuso/rgraph
[INFO] finished frobbing LuisAyuso/rgraph
[INFO] frobbed toml for LuisAyuso/rgraph written to work/ex/beta-1.37-6/sources/1.36.0/gh/LuisAyuso/rgraph/Cargo.toml
[INFO] started frobbing LuisAyuso/rgraph
[INFO] finished frobbing LuisAyuso/rgraph
[INFO] frobbed toml for LuisAyuso/rgraph written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/LuisAyuso/rgraph/Cargo.toml
[INFO] crate LuisAyuso/rgraph 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/LuisAyuso/rgraph/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 LuisAyuso/rgraph 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/LuisAyuso/rgraph:/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] 130da437cfaa522ed9572f2151f1837935321bf29165ddd2ce804def863f3be2
[INFO] running `"docker" "start" "-a" "130da437cfaa522ed9572f2151f1837935321bf29165ddd2ce804def863f3be2"`
[INFO] [stderr]    Compiling dot v0.1.4
[INFO] [stderr]    Compiling rgraph v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:123:1
[INFO] [stderr]     |
[INFO] [stderr] 123 | #![feature(test)]
[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 `rgraph`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "130da437cfaa522ed9572f2151f1837935321bf29165ddd2ce804def863f3be2"`
[INFO] running `"docker" "rm" "-f" "130da437cfaa522ed9572f2151f1837935321bf29165ddd2ce804def863f3be2"`
[INFO] [stdout] 130da437cfaa522ed9572f2151f1837935321bf29165ddd2ce804def863f3be2