[INFO] updating cached repository mraof/Simumech
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mraof/Simumech
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mraof/Simumech" "work/ex/beta-1.37-6/sources/1.36.0/gh/mraof/Simumech"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/mraof/Simumech'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mraof/Simumech" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mraof/Simumech"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mraof/Simumech'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0511065a99433e05e7c776660fec23d96d5a7e37
[INFO] sha for GitHub repo mraof/Simumech: 0511065a99433e05e7c776660fec23d96d5a7e37
[INFO] validating manifest of mraof/Simumech 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 mraof/Simumech 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 mraof/Simumech
[INFO] removed path dependency tumblr from mraof/Simumech
[INFO] finished frobbing mraof/Simumech
[INFO] frobbed toml for mraof/Simumech written to work/ex/beta-1.37-6/sources/1.36.0/gh/mraof/Simumech/Cargo.toml
[INFO] started frobbing mraof/Simumech
[INFO] removed path dependency tumblr from mraof/Simumech
[INFO] finished frobbing mraof/Simumech
[INFO] frobbed toml for mraof/Simumech written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mraof/Simumech/Cargo.toml
[INFO] crate mraof/Simumech 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]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mraof/Simumech/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[INFO] the lockfile is outdated, regenerating it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] [stderr]     Updating git repository `https://github.com/mraof/discord-rs`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/morbitgen`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/tcpgen`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/rust-websocket`
[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] [stderr]     Updating git repository `https://github.com/mraof/discord-rs`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/morbitgen`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/tcpgen`
[INFO] [stderr]     Updating git repository `https://github.com/mraof/rust-websocket`
[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 mraof/Simumech 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/mraof/Simumech:/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] b9c4fb1c34cf99b9a5084772703f4cd6a960070177d831baec6dd7b3f9dbc7cd
[INFO] running `"docker" "start" "-a" "b9c4fb1c34cf99b9a5084772703f4cd6a960070177d831baec6dd7b3f9dbc7cd"`
[INFO] [stderr] warning: dependency (tumblr) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling stdweb-internal-runtime v0.1.4
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling base-x v0.2.5
[INFO] [stderr]    Compiling boolinator v2.4.0
[INFO] [stderr]    Compiling yew v0.7.0
[INFO] [stderr]    Compiling astro v2.0.0
[INFO] [stderr]    Compiling distance v0.4.0
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling meval v0.2.0
[INFO] [stderr]    Compiling stdweb v0.4.18
[INFO] [stderr]    Compiling base64 v0.5.2
[INFO] [stderr]    Compiling libflate v0.1.25
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling serde_urlencoded v0.4.3
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-buf v0.1.1
[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/regex-1.2.0/src/lib.rs:522:34
[INFO] [stderr]     |
[INFO] [stderr] 522 | #![cfg_attr(feature = "pattern", feature(pattern))]
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling http v0.1.18
[INFO] [stderr]    Compiling string v0.2.1
[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 `regex`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b9c4fb1c34cf99b9a5084772703f4cd6a960070177d831baec6dd7b3f9dbc7cd"`
[INFO] running `"docker" "rm" "-f" "b9c4fb1c34cf99b9a5084772703f4cd6a960070177d831baec6dd7b3f9dbc7cd"`
[INFO] [stdout] b9c4fb1c34cf99b9a5084772703f4cd6a960070177d831baec6dd7b3f9dbc7cd